CN110579419B - Low cycle fatigue reliability test method and device - Google Patents
Low cycle fatigue reliability test method and device Download PDFInfo
- Publication number
- CN110579419B CN110579419B CN201910806101.0A CN201910806101A CN110579419B CN 110579419 B CN110579419 B CN 110579419B CN 201910806101 A CN201910806101 A CN 201910806101A CN 110579419 B CN110579419 B CN 110579419B
- Authority
- CN
- China
- Prior art keywords
- engine
- sub
- temperature
- working condition
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0224—Thermal cycling
Abstract
The invention belongs to the technical field of engines, and discloses a low cycle fatigue reliability test method and device. The low cycle fatigue reliability test method comprises a cold and hot impact test link; the cold and hot impact test link comprises the following steps: controlling the full-speed and full-load operation of the engine within a first preset working condition time; and controlling the engine to run at an idle speed without load within a second preset working condition time. Through the mode, the low-cycle fatigue reliability test is carried out on the engine, the reliability and the durability of various parts of the engine under the cold and hot alternating impact are tested, and the technical problems that in the low-cycle fatigue reliability test in the prior art, the high-heat load test is unstable, and the cycle number is lower than the normal low-cycle fatigue failure number are solved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a low cycle fatigue reliability test method and device.
Background
Fatigue failure of current cylinder head materials includes two categories: high cycle fatigue failure and low cycle fatigue failure. High cycle fatigue refers to fatigue with a lower stress level acting on the material, and the failure cycle number is generally higher than 10000-100000 times; low cycle fatigue refers to fatigue with a high level of stress on the material, typically less than 10000 cycles to failure. The cylinder cover is under the action of load circulation at constant temperature, the stress level is lower at the moment, only the load circulation exists, the high cycle fatigue belongs to, and the application is mature in test development and analysis. However, under the combined action of the temperature cycle and the load cycle, the stress level is higher, the frequency of the failure cycle is about 3000-4000, and the low-cycle fatigue belongs to the low-cycle fatigue, and the test development on the aspect is relatively lacked at present.
The principle of low cycle fatigue cracking of a cylinder cover is as follows: the cylinder cover is easier to crack under the action of compression and tensile stress generated by cold and hot impact alternately, because when the internal combustion engine works, the temperature of the water jacket wall of the cylinder cover is 60-80 ℃, but the temperature of the bottom surface of the cylinder cover reaches 400-480 ℃, so that expansion with heat and contraction with cold are limited, strong compression stress occurs on a firepower surface, a cooling surface is subjected to great tensile action, and under the condition of high temperature, the elastic limit of a material is reduced, and plastic deformation occurs. The compressive stress at high temperature is reduced because of the plastic deformation. When the temperature of the fire surface is reduced after the internal combustion engine is stopped but is not yet at the ambient temperature, the compressive stress is completely disappeared, and when the temperature is continuously reduced to the ambient temperature, the tensile stress appears on the surface, which is the residual tensile stress. Whether cracks can occur or not depends on the magnitude of the tensile stress, if the temperature of a local area exceeds an allowable value, the running time is longer, the residual tensile stress is larger, and after repeated action of pulling and pressing occurs through a plurality of heating-cooling cycles, the cracks can also be caused by fatigue.
At present, a cold and hot impact test method is available in the national standard GB19055 automobile engine reliability test method to perform low cycle fatigue test, wherein the temperature cycle mode depends on natural rise and natural fall driven by combustion heat when an engine runs, the period of temperature change is longer, the time is extremely short when the working conditions of heat load and cold load are stable, the temperature of a cylinder cover material changes along with the water temperature, and the highest heat load and the lowest heat load cannot be stabilized; the cycle time is 6 minutes, the cold and hot impact is regulated in the standard to be 200-300 hours in total, the total cycle time is less than 3000 times, and is lower than the normal cylinder cover low-cycle fatigue failure time, so that the problem is not easy to find and examine.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a low-cycle fatigue reliability test method and a low-cycle fatigue reliability test device, and aims to solve the technical problems that in a low-cycle fatigue reliability test in the prior art, a high thermal load test is unstable, and the cycle number is lower than the normal low-cycle fatigue failure number.
In order to achieve the aim, the invention provides a low cycle fatigue reliability test method, which comprises a cold and hot impact test link;
the cold and hot impact test link comprises the following steps:
controlling the full-speed and full-load operation of the engine within a first preset working condition time;
and controlling the engine to run at an idle speed without load within a second preset working condition time.
Preferably, the first preset operating time comprises: a first sub-phase time, a second sub-phase time, and a third sub-phase time;
the step of controlling the full-speed and full-load operation of the engine within the first preset working condition time specifically comprises the following steps of:
increasing the speed and load of the engine to run to a full speed and full load condition during the first sub-phase time;
controlling the temperature of the cooling liquid to rise to a first working condition temperature in the second sub-stage time;
and controlling the engine to keep operating at the full speed and full load condition at the first condition temperature in the third sub-phase time.
Preferably, the second preset operating time includes: a fourth sub-phase time, a fifth sub-phase time, and a sixth sub-phase time;
and in a second preset working condition time, controlling the idling no-load operation of the engine, and specifically comprising the following steps of:
reducing the rotating speed and the load of the engine in the fourth sub-phase time so as to run to an idle no-load working condition;
controlling the temperature of the cooling liquid to be reduced to a second working condition temperature in the fifth sub-stage time;
and controlling the engine to keep the idling no-load operation condition at the second operating condition temperature in the sixth sub-phase time.
Preferably, the low cycle fatigue reliability test method further comprises an initial performance test link; the initial performance test link is before the cold and hot impact test link;
wherein, the initial performance test link comprises the following steps:
controlling the engine to carry out a running-in test according to a running-in standard, and prompting to replace engine oil after the running-in test is finished;
controlling the engine to operate at a preset rotating speed and a preset load so as to increase the water outlet temperature and the engine oil temperature of the engine;
when the water outlet temperature of the engine reaches a first preset temperature and the engine oil temperature reaches a second preset temperature, controlling the engine to perform initial performance tests, wherein the initial performance tests comprise an external characteristic test and a universal characteristic test.
Preferably, the low cycle fatigue reliability test method further comprises a retest performance test link, wherein the retest performance test link is after the cold and hot shock test link;
wherein, the retest performance test link comprises the following steps:
and controlling the engine to perform retest performance tests, wherein the retest performance tests comprise the external characteristic test and the universal characteristic test.
In addition, in order to achieve the above object, the present invention further provides a low cycle fatigue reliability testing apparatus, which includes a rack water constant temperature system for performing a cold and hot shock test, wherein the rack water constant temperature system includes a thermal shock control system and a cold shock control system:
the thermal shock control system is used for controlling the full-speed and full-load operation of the engine within a first preset working condition time;
and the cold impact control system is used for controlling the idling no-load operation of the engine within a second preset working condition time.
Preferably, the first preset operating time comprises: a first sub-phase time, a second sub-phase time, and a third sub-phase time;
the thermal shock control system is further used for increasing the rotating speed and the load of the engine in the first sub-stage time so as to operate to a full-speed full-load working condition; controlling the temperature of the cooling liquid to rise to a first working condition temperature in the second sub-stage time; and controlling the engine to keep operating at the full speed and full load condition at the first condition temperature in the third sub-phase time.
Preferably, the second preset operating time includes: a fourth sub-phase time, a fifth sub-phase time, and a sixth sub-phase time;
the cold impact control system is further used for reducing the rotating speed and the load of the engine in the fourth sub-stage time so as to operate to an idling no-load working condition; controlling the temperature of the cooling liquid to be reduced to a second working condition temperature in the fifth sub-stage time; and controlling the engine to keep the idling no-load operation condition at the second operating condition temperature in the sixth sub-phase time.
Preferably, the low cycle fatigue reliability testing device further comprises a three-way electromagnetic valve; the thermal shock control system comprises a hot water tank and a first circulating water pump;
the thermal shock control system is further used for controlling the hot water end of the three-way electromagnetic valve to be opened when the engine runs to full speed, hot water is filled into the engine through the first circulating water pump, and the outlet water temperature of the engine is increased to the first working condition temperature.
Preferably, the cold impact control system comprises a cold water tank and a second circulating water pump;
and the cold impact control system is also used for controlling the cold water end of the three-way electromagnetic valve to be opened when the engine runs to an idle speed, and cold water is filled into the engine through the second circulating water pump, so that the temperature of the water outlet of the engine is reduced to the second working condition temperature.
The invention provides a low cycle fatigue reliability test method, which comprises a cold and hot shock test link; the cold and hot impact test link comprises the steps of controlling the full-speed and full-load operation of an engine within a first preset working condition time; and controlling the engine to run at an idle speed without load within a second preset working condition time. The invention mainly aims to provide a low-cycle fatigue reliability test method and equipment, which are used for carrying out a low-cycle fatigue reliability test on an engine in the mode, testing the reliability and durability of various parts of the engine under cold and hot alternating impact and solving the technical problems that in the low-cycle fatigue reliability test in the prior art, a high-heat load test is unstable and the cycle frequency is lower than the normal low-cycle fatigue failure frequency.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of the low cycle fatigue reliability testing method of the present invention;
FIG. 2 is a schematic flow chart of a second embodiment of the low cycle fatigue reliability testing method of the present invention;
FIG. 3 is a flow chart of a third embodiment of the low cycle fatigue reliability testing method of the present invention;
FIG. 4 is a schematic flow chart of a fourth embodiment of the low cycle fatigue reliability testing method of the present invention;
FIG. 5 is a block diagram of a low cycle fatigue reliability testing apparatus according to a first embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a low cycle fatigue reliability testing apparatus according to a first embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the present invention provides a low cycle fatigue reliability test method, and referring to fig. 1, fig. 1 is a schematic flow diagram of a first embodiment of a low cycle fatigue reliability test method according to the present invention.
In this embodiment, the low cycle fatigue reliability test method includes a cold and hot shock test link;
the cold and hot impact test link comprises the following steps:
step S10: and controlling the full-speed and full-load operation of the engine within the first preset working condition time.
It should be noted that, under the combined action of the temperature cycle and the load cycle, the stress level of the engine is higher, the number of the failure cycles is about 3000 + 4000, and the low cycle fatigue belongs to the low cycle fatigue, and the low cycle fatigue reliability test method of the scheme is formulated through comprehensive consideration and design according to the principle of the low cycle fatigue failure of the engine and the low cycle fatigue working condition used in the CAE analysis, wherein the engine can be a gasoline engine or a diesel engine, the low cycle fatigue reliability test cycle can be defined as 360s, the present embodiment is not limited to this, and the low cycle fatigue reliability test needs to control three parameters, the engine speed, the load and the water outlet temperature. The temperature rising section 180s and the temperature lowering section 180s may be defined, which is not limited in this embodiment. And controlling the full-speed full-load operation of the engine within a first preset working condition time, wherein the first preset working condition time is a temperature rise section for 180s, the engine is raised to a rated rotating speed and full load, the working condition is maintained until the whole process lasts for 180s after the engine is raised to full-speed full load, and a low-cycle fatigue reliability test is carried out on the engine under high-heat full-load rapid thermal shock.
Step S20: and controlling the engine to run at an idle speed without load within a second preset working condition time.
It should be noted that the low cycle fatigue reliability test cycle can be defined as 360s, which is not limited in this embodiment, and the low cycle fatigue reliability test needs to control three parameters, namely, the engine speed, the load and the water outlet temperature. The temperature rising section 180s and the temperature lowering section 180s may be defined, which is not limited in this embodiment. And controlling the engine to run in an idle speed and no load mode within a second preset working condition time, wherein the second preset working condition time is a temperature reduction section for 180s, the engine runs to be reduced to the idle speed and no load under the neutral condition, the working condition is maintained to be kept for 180s in the whole process after the engine is reduced to the idle speed and no load, and the engine is subjected to a low-cycle fatigue reliability test under low-temperature cold shock.
It is easy to understand that the low cycle fatigue reliability test cycle can be defined as 360s, wherein the temperature rise section is 180s, the temperature drop section is 180s, in the temperature rise section, the engine speed and load are quickly increased to full speed and full load, the operating condition is maintained after the engine speed and load are increased to full speed and full load, the whole process lasts for 180s, then the speed and load are quickly reduced to the idle speed and no-load operating condition respectively, the operating condition is maintained until the whole process lasts for 180s, the 360s process is a low cycle fatigue reliability test cycle, and the test can be performed for 4000 cycles, which is not limited in this embodiment.
In the embodiment, the full-speed and full-load operation of the engine is controlled by performing a cold and hot shock test, namely within a first preset working condition time; and controlling the engine to run at an idle speed without load within a second preset working condition time, carrying out a low-cycle fatigue reliability test on the engine, and testing the reliability and durability of various parts of the engine under cold and hot alternating impact.
Referring to fig. 2, fig. 2 is a schematic flow chart of a low cycle fatigue reliability testing method according to a second embodiment of the present invention.
Based on the first embodiment, in the low cycle fatigue reliability testing method of this embodiment, the first preset working condition time includes: a first sub-phase time, a second sub-phase time, and a third sub-phase time;
the step S10 specifically includes:
step S101: and increasing the speed and the load of the engine to operate to a full-speed full-load condition in the first sub-stage time.
It should be noted that the first preset operation time, i.e. the warming period 180s, is that the engine is warmed to full speed and full load within the first sub-phase time, where the first sub-phase time is a load change time, which may be defined as 10s, which is not limited in this embodiment.
Step S102: and controlling the temperature of the cooling liquid to rise to the first working condition temperature in the second sub-stage time.
It should be noted that, in the temperature rise section 180s, the engine speed and the load are rapidly increased to full speed and full load, where the second sub-stage time is a coolant delay time, the coolant is transferred from the cold water path to the hot water path, the second sub-stage time may be defined as 20s, this embodiment is not limited thereto, that is, the coolant delay time is 20s, the requirement of the operating temperature is met, the first operating temperature, that is, the maximum temperature, may be defined as 100 ± 2 ℃, and this embodiment is not limited thereto.
Step S103: and controlling the engine to keep operating at the full speed and full load condition at the first condition temperature in the third sub-phase time.
It should be noted that, the third sub-phase time is the time for the engine to maintain the full-speed and full-load operation at the first operating temperature, and may be defined as 150s, which is not limited in this embodiment.
The embodiment increases the rotating speed and the load of the engine in the first sub-phase time to operate to a full-speed full-load working condition; controlling the temperature of the cooling liquid to rise to a first working condition temperature in the second sub-stage time; and controlling the engine to keep operating at the full speed and full load condition at the first condition temperature in the third sub-phase time. The engine is controlled to be lifted to a rated rotating speed and full load, the working condition is kept after the engine is lifted to full speed and full load, and a low cycle fatigue reliability test is carried out on the engine under high-heat full-load rapid thermal shock.
Referring to fig. 3, fig. 3 is a schematic flow chart of a low cycle fatigue reliability testing method according to a third embodiment of the present invention.
Based on the first embodiment, in the low cycle fatigue reliability testing method of this embodiment, the second preset working condition time includes: a fourth sub-phase time, a fifth sub-phase time, and a sixth sub-phase time;
the step S20 specifically includes:
step S201: and reducing the rotating speed and the load of the engine in the fourth sub-phase time so as to run to an idle no-load working condition.
It should be noted that, the second preset operation time, i.e. the cooling period 180s, during the fourth sub-phase time, the engine is lowered to the idle speed and no load, where the fourth sub-phase time is a load change time and may be defined as 10s, which is not limited in this embodiment.
Step S202: and controlling the temperature of the cooling liquid to be reduced to the second working condition temperature in the fifth sub-stage time.
It should be noted that, in the temperature reduction section 180s, the engine speed and the load are rapidly reduced to the idle speed without load, where the fifth sub-stage time is the coolant delay time, the coolant is transferred from the hot water path to the cold water path, the fifth sub-stage time may be defined as 20s, this embodiment is not limited thereto, that is, the coolant delay time is 20s, the requirement of the operating temperature is met, and the second operating temperature, that is, the minimum temperature, may be defined as 30 ± 3 ℃, this embodiment is not limited thereto.
Step S203: and controlling the engine to keep the idling no-load operation condition at the second operating condition temperature in the sixth sub-phase time.
It should be noted that, the sixth sub-phase time is a time for the engine to maintain the idle and no-load operation at the second operating temperature, and may be defined as 150s, which is not limited in this embodiment.
In the embodiment, the rotating speed and the load of the engine are reduced in the fourth sub-phase time so as to operate to an idle no-load working condition; controlling the temperature of the cooling liquid to be reduced to a second working condition temperature in the fifth sub-stage time; and controlling the engine to keep the idling no-load operation condition at the second operating condition temperature in the sixth sub-phase time. The engine is controlled to run to be reduced to idle speed and no load under the neutral condition, the working condition is kept after the engine is reduced to the idle speed and no load, and a low-cycle fatigue reliability test is carried out on the engine under low-temperature cold shock.
Referring to fig. 4, fig. 4 is a schematic flow chart of a low cycle fatigue reliability testing method according to a fourth embodiment of the present invention.
Based on the first embodiment, the low cycle fatigue reliability test method further comprises an initial performance test link; the initial performance test link is before the cold and hot impact test link;
wherein, the initial performance test link comprises the following steps:
step S001: and controlling the engine to carry out a running-in test according to the running-in specification, and prompting to replace engine oil after the running-in test is finished.
According to the standard running-in of an engine manufacturer, before the engine is started for the first time, dust and foreign matters in the whole air intake system are checked and removed, and at the initial stage and the final stage of the running-in, engine oil samples and unused engine oil samples are taken for comparative analysis, and engine oil replacement is prompted for subsequent tests.
Step S002: and controlling the engine to operate at a preset rotating speed and a preset load so as to increase the water outlet temperature and the engine oil temperature of the engine.
It should be noted that the engine is controlled to warm up by operating at a preset rotation speed and a preset load, where the preset rotation speed may be defined as 30% of the rated rotation speed, and the preset load may be defined as 50% of the load, which is not limited in this embodiment, and the engine is warmed up to raise the outlet water temperature and the engine oil temperature of the engine.
Step S003: when the water outlet temperature of the engine reaches a first preset temperature and the engine oil temperature reaches a second preset temperature, controlling the engine to perform initial performance tests, wherein the initial performance tests comprise an external characteristic test and a universal characteristic test.
It should be noted that, when the water outlet temperature of the engine reaches a first preset temperature and the engine oil temperature reaches a second preset temperature, where the first preset temperature is the water outlet temperature and may be defined as 85 ± 5 ℃, and the second preset temperature is the engine oil temperature and may be defined as 75 ± 5 ℃, this embodiment is not limited thereto, and at this time, the engine is controlled to perform a preliminary performance test, where the preliminary performance test includes an external characteristic test and a universal characteristic test.
Wherein the external property test is exemplified by: keeping the engine at a certain throttle opening, stabilizing the rotating speed, and measuring the power, specific oil consumption and the like under the working condition; then the load (torque change) of the tested engine is adjusted to change the rotating speed of the engine, and then the power and specific oil consumption at another rotating speed are measured, and the steps are sequentially carried out according to a certain rotating speed interval. The values at different rotational speeds can be determined and the formation of a continuous curve of these values point by point produces a power curve, a torque curve and a specific fuel consumption curve, which correspond to the respective rotational speed range. This embodiment is not limited in this regard.
The universal characteristic test is exemplified: after warming up, the engine is adjusted to a rated working condition, namely a rated rotating speed and a rated power, assuming that the rated rotating speed and the rated power are 2000r/min and 100kW, the corresponding torque (also called load) is 477.5Nm, the test bed control mode is a rotating speed accelerator mode, the accelerator is fully opened, and after boundary conditions such as water temperature, air inlet humidity, air inlet negative pressure and exhaust back pressure are well controlled, various required parameters are recorded; then, according to the torque of the working condition, calculating torque values of 10% and 20% … 90% of the maximum torque, adjusting the bench control mode to a rotating speed torque mode, keeping the rated rotating speed unchanged, reducing the torque to 429.75Nm, recording required parameters after all parameters of the engine are basically stable, and recording 10 torque points of the rotating speed according to the step to obtain the load characteristic of the rated rotating speed; then the test bed is switched to a rotating speed accelerator mode, the accelerator is fully opened, then the speed is reduced by 100r/min to 1900r/min, the corresponding steps are repeated, the required parameters of ten torque points are recorded from top to bottom, and the load characteristic test at the rotating speed is completed; then, the rotating speed is reduced to carry out load characteristic test until the required minimum rotating speed is reached, such as 800 r/min; and finally, drawing a universal characteristic curve according to the data of the 13 × 10 — 130 working conditions. The torque interval and the rotational speed interval can be increased or decreased as required, and usually every 200r/min and every 8-10 torque points are selected when performing a universal characteristic test, which is not limited in this embodiment.
Further, the low cycle fatigue reliability test method further comprises a retest performance test link, wherein the retest performance test link is after the cold and hot shock test link;
wherein, the retest performance test link comprises the following steps:
step S30: and controlling the engine to perform retest performance tests, wherein the retest performance tests comprise the external characteristic test and the universal characteristic test.
It should be noted that the retest performance test includes the external characteristic test and the universal characteristic test.
Wherein the external property test is exemplified by: keeping the engine at a certain throttle opening, stabilizing the rotating speed, and measuring the power, specific oil consumption and the like under the working condition; then the load (torque change) of the tested engine is adjusted to change the rotating speed of the engine, and then the power and specific oil consumption at another rotating speed are measured, and the steps are sequentially carried out according to a certain rotating speed interval. The values at different rotational speeds can be determined and the formation of a continuous curve of these values point by point produces a power curve, a torque curve and a specific fuel consumption curve, which correspond to the respective rotational speed range. This embodiment is not limited in this regard.
The universal characteristic test is exemplified: after warming up, the engine is adjusted to a rated working condition, namely a rated rotating speed and a rated power, assuming that the rated rotating speed and the rated power are 2000r/min and 100kW, the corresponding torque (also called load) is 477.5Nm, the test bed control mode is a rotating speed accelerator mode, the accelerator is fully opened, and after boundary conditions such as water temperature, air inlet humidity, air inlet negative pressure and exhaust back pressure are well controlled, various required parameters are recorded; then, according to the torque of the working condition, calculating torque values of 10% and 20% … 90% of the maximum torque, adjusting the bench control mode to a rotating speed torque mode, keeping the rated rotating speed unchanged, reducing the torque to 429.75Nm, recording required parameters after all parameters of the engine are basically stable, and recording 10 torque points of the rotating speed according to the step to obtain the load characteristic of the rated rotating speed; then the test bed is switched to a rotating speed accelerator mode, the accelerator is fully opened, then the speed is reduced by 100r/min to 1900r/min, the corresponding steps are repeated, the required parameters of ten torque points are recorded from top to bottom, and the load characteristic test at the rotating speed is completed; then, the rotating speed is reduced to carry out load characteristic test until the required minimum rotating speed is reached, such as 800 r/min; and finally, drawing a universal characteristic curve according to the data of the 13 × 10 — 130 working conditions. The torque interval and the rotational speed interval can be increased or decreased as required, and usually every 200r/min and every 8-10 torque points are selected when performing a universal characteristic test, which is not limited in this embodiment.
It will be readily appreciated that the engine is subjected to the preliminary performance test once per predetermined performance test time. That is, in the testing process, it can be defined that the performance test is performed every 100h and includes an external characteristic test and a universal characteristic test, which is not limited in this embodiment. After the test is finished, the performance of the engine is measured and compared with the performance of the engine before the test for evaluation; disassembling the engine into parts, and obtaining the low cycle fatigue reliability test result of the engine according to the performance parameters of the parts.
In this embodiment, the initial performance test link is performed before the thermal shock test link: controlling the engine to carry out a running-in test according to a running-in standard, and prompting to replace engine oil after the running-in test is finished; controlling the engine to operate at a preset rotating speed and a preset load so as to increase the water outlet temperature and the engine oil temperature of the engine; when the water outlet temperature of the engine reaches a first preset temperature and the engine oil temperature reaches a second preset temperature, controlling the engine to perform initial performance tests, wherein the initial performance tests comprise an external characteristic test and a universal characteristic test. And the retest performance test link is carried out after the cold and hot impact test link: and controlling the engine to perform retest performance tests, wherein the retest performance tests comprise the external characteristic test and the universal characteristic test. By the mode, the low-cycle fatigue reliability test is carried out on the engine, and after the test is finished, the performance of the measured engine is compared with the performance of the engine before the test for evaluation; disassembling the engine into parts, and obtaining the low cycle fatigue reliability test result of the engine according to the performance parameters of the parts.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the low cycle fatigue reliability test method provided in any embodiment of the present invention, and are not described herein again.
Referring to fig. 5, fig. 5 is a block diagram illustrating a first embodiment of a low cycle fatigue reliability testing apparatus according to the present invention.
As shown in fig. 5, the low cycle fatigue reliability testing apparatus provided by the embodiment of the present invention includes a rack water constant temperature system, and the rack water constant temperature system is used for performing a cold and hot shock test, wherein the rack water constant temperature system includes a thermal shock control system 10 and a cold shock control system 20.
The thermal shock control system 10 is used for controlling the full-speed and full-load operation of the engine within a first preset working condition time; the first preset working condition time comprises: a first sub-phase time, a second sub-phase time, and a third sub-phase time; the thermal shock control system is further used for increasing the rotating speed and the load of the engine in the first sub-stage time so as to operate to a full-speed full-load working condition; controlling the temperature of the cooling liquid to rise to a first working condition temperature in the second sub-stage time; and controlling the engine to keep operating at the full speed and full load condition at the first condition temperature in the third sub-phase time.
And the cold impact control system 20 is used for controlling the engine to run at idle speed and no load within a second preset working condition time. The second preset working condition time comprises: a fourth sub-phase time, a fifth sub-phase time, and a sixth sub-phase time; the cold impact control system is further used for reducing the rotating speed and the load of the engine in the fourth sub-stage time so as to operate to an idling no-load working condition; controlling the temperature of the cooling liquid to be reduced to a second working condition temperature in the fifth sub-stage time; and controlling the engine to keep the idling no-load operation condition at the second operating condition temperature in the sixth sub-phase time.
It should be noted that the low cycle fatigue reliability testing apparatus includes a rack water constant temperature system, the rack water constant temperature system is used for performing a cold and hot shock test, wherein the rack water constant temperature system includes a thermal shock control system 10 and a cold shock control system 20, and the thermal shock control system 10 and the cold shock control system 20 belong to a rack test control system. Under the combined action of temperature cycle and load cycle, the stress level of the engine is higher, the frequency of the failure cycle is about 3000-4000, the low-cycle fatigue belongs to low-cycle fatigue, the low-cycle fatigue reliability test method is formulated through comprehensive consideration and design according to the principle of low-cycle fatigue failure of the engine and the low-cycle fatigue working condition used in CAE analysis, the engine can be a gasoline engine or a diesel engine, the low-cycle fatigue reliability test cycle can be defined as 360s, the low-cycle fatigue reliability test is not limited in the embodiment, and three parameters, the engine rotating speed, the load and the water outlet temperature need to be controlled in the low-cycle fatigue reliability test. The temperature rising section 180s and the temperature lowering section 180s may be defined, which is not limited in this embodiment. And controlling the full-speed full-load operation of the engine within a first preset working condition time, wherein the first preset working condition time is a temperature rise section for 180s, the engine is raised to a rated rotating speed and full load, the working condition is maintained until the whole process lasts for 180s after the engine is raised to full-speed full load, and a low-cycle fatigue reliability test is carried out on the engine under high-heat full-load rapid thermal shock. And controlling the engine to run in an idle speed and no load mode within a second preset working condition time, wherein the second preset working condition time is a temperature reduction section for 180s, the engine runs to be reduced to the idle speed and no load under the neutral condition, the working condition is maintained to be kept for 180s in the whole process after the engine is reduced to the idle speed and no load, and the engine is subjected to a low-cycle fatigue reliability test under low-temperature cold shock.
It is easy to understand that the low cycle fatigue reliability test cycle can be defined as 360s, wherein the temperature rise section is 180s, the temperature drop section is 180s, the engine speed and load are quickly increased to full speed and full load in the temperature rise section, the working condition is maintained after the engine speed and load are increased to full speed and full load, the whole process lasts for 180s, the engine speed and load are quickly increased to full speed and full load in the temperature rise section 180s, the second sub-phase time is the delay time of the cooling liquid, the cooling liquid is switched from the cold water circuit to the hot water circuit, the second sub-phase time can be defined as 20s, the embodiment is not limited, namely the working condition temperature requirement is reached in the cooling liquid delay 20s, the first working condition temperature, namely the maximum temperature, can be defined as 100 ± 2 ℃, and the embodiment is not limited. And then rapidly reducing the rotating speed and the load to idle and no-load working conditions respectively, keeping the working conditions until the whole process lasts for 180s, and rapidly reducing the rotating speed and the load of the engine to idle and no-load in a temperature reduction section for 180s, wherein the fifth sub-stage time is the delay time of the cooling liquid, the cooling liquid is converted from a hot water path to a cold water path, the fifth sub-stage time can be defined as 20s, the method is not limited, namely the requirement of the working condition temperature is met within 20s of the delay time of the cooling liquid, the second working condition temperature is the lowest temperature, and can be defined as 30 +/-3 ℃, and the method is not limited. The 360s process is a cycle of the low cycle fatigue reliability test, which can be performed for 4000 cycles, but this embodiment is not limited thereto.
In this embodiment, the device comprises a rack water constant temperature system, wherein the rack water constant temperature system is used for performing a cold and hot shock test, and the rack water constant temperature system comprises a thermal shock control system and a cold shock control system, and controls the full-speed and full-load operation of an engine within a first preset working condition time; and controlling the engine to run at an idle speed without load within a second preset working condition time, carrying out a low-cycle fatigue reliability test on the engine, and testing the reliability and durability of various parts of the engine under cold and hot alternating impact.
Further, referring to fig. 6, fig. 6 is a schematic circuit structure diagram of a low cycle fatigue reliability testing apparatus according to a first embodiment of the present invention.
FIG. 6 is a schematic diagram of a circuit structure of a thermal cycle process during a thermal shock test in a low cycle fatigue reliability test apparatus, wherein the low cycle fatigue reliability test apparatus further includes a three-way solenoid valve 3 wayvalve; the thermal shock control system comprises a Hot water tank Hot tank and a first circulating water Pump 1; the thermal shock control system is further used for controlling the three-way electromagnetic valve 3way valve to open a hot water end when the Engine runs to full speed, hot water is filled into the Engine through the first circulating water Pump 1, and the outlet water temperature of the Engine is increased to the first working condition temperature.
It should be noted that, when the Engine runs to the rated rotation speed, the hot water end of the three-way solenoid valve 3way valve is fully opened, hot water is filled into the Engine through the first circulating water Pump 1, so that the outlet water temperature of the Engine is rapidly increased to 100 ± 2 ℃, which is not limited in this embodiment. Meanwhile, the flow of cooling water entering the exchanger is regulated by a proportional valve (not shown) in the cooling water channel system of the Hot water tank Hot tank, so that the temperature of the Hot water tank Hot tank is stable.
Further, the Cold impact control system comprises a Cold water tank Cold tank and a second circulating water Pump Pump 2; and the cold impact control system is also used for controlling the cold water end of the three-way electromagnetic valve 3way valve to be opened when the Engine runs to the idle speed, and cold water is filled into the Engine through the second circulating water Pump Pump 2, so that the outlet water temperature of the Engine is reduced to the second working condition temperature.
It should be noted that, when the Engine falls to the idle speed, the cold water end of the three-way electromagnetic valve 3way valve is fully opened, and cold water is filled into the Engine through the second circulating water Pump 2, so that the outlet water temperature of the Engine is rapidly reduced to 30 ℃ ± 3 ℃, which is not limited in this embodiment. Meanwhile, the Cold water tank Cold tank regulates the flow of cooling water entering the exchanger through a proportional valve (not shown) in the cooling water path system, and the temperature of the Cold water tank Cold tank is ensured to be stable.
As shown in fig. 6, a Leakage gas sampling is used for detecting Leakage when the low cycle fatigue reliability testing apparatus performs a test, and an Expansion tank is used for accommodating an Expansion amount of water in a system in a rack water constant temperature system, and also plays a role in constant pressure and supplementing water to the rack water constant temperature system.
The low-cycle fatigue reliability test device of the embodiment adjusts the water temperature entering the Engine by arranging a three-way electromagnetic valve 3way valve; the thermal shock control system comprises a Hot water tank Hot tank and a first circulating water Pump 1; and the thermal shock control system is used for opening the hot water end of the three-way electromagnetic valve when controlling the Engine to run to full speed, and filling hot water into the Engine through the first circulating water pump so as to enable the outlet water temperature of the Engine to rise to the first working condition temperature. The Cold impact control system comprises a Cold water tank Cold tank and a second circulating water Pump Pump 2; and the cold impact control system is also used for controlling the cold water end of the three-way electromagnetic valve to be opened when the Engine runs to an idle speed, and cold water is filled into the Engine through the second circulating water Pump Pump 2, so that the outlet water temperature of the Engine is reduced to the second working condition temperature. The low-cycle fatigue reliability test device is used for carrying out a low-cycle fatigue reliability test on the engine to test the reliability and durability of various parts of the engine under cold and hot alternating impact.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the low cycle fatigue reliability testing apparatus provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A low cycle fatigue reliability test method is characterized by comprising a cold and hot shock test link, wherein a low cycle fatigue reliability test cycle is defined as 360s, wherein a temperature rise section is 180s, and a temperature drop section is 180 s;
the cold and hot impact test link comprises the following steps:
controlling the full-speed and full-load operation of the engine within a first preset working condition time;
controlling the engine to run at an idle speed and without load within a second preset working condition time;
the first preset working condition time comprises: a first sub-phase time, a second sub-phase time, and a third sub-phase time, wherein the rapid ramp-up of the engine speed and load to full speed full load during the ramp-up period 180s comprises:
the first sub-stage time is 10S, and the rotating speed and the load of the engine are increased within the first sub-stage time so as to run to a full-speed full-load working condition;
the second sub-stage time is 20S, and the temperature of the cooling liquid is controlled to rise to the first working condition temperature in the second sub-stage time;
the third sub-phase time is 150S, and the engine is controlled to keep operating at the full-speed full-load working condition at the first working condition temperature in the third sub-phase time;
the second preset working condition time comprises: a fourth sub-phase time, a fifth sub-phase time, and a sixth sub-phase time, wherein, during a cool-down period 180s, controlling the engine to idle unloaded comprises:
the fourth sub-phase time is 10S, and the rotating speed and the load of the engine are reduced within the fourth sub-phase time so as to run to an idling no-load working condition;
the fifth sub-stage time is 20S, and the temperature of the cooling liquid is controlled to be reduced to the second working condition temperature in the fifth sub-stage time;
and the sixth sub-phase time is 150S, and the engine is controlled to keep the idling no-load working condition running at the second working condition temperature in the sixth sub-phase time.
2. The method of claim 1, wherein the low cycle fatigue reliability testing method further comprises an initial performance testing step; the initial performance test link is before the cold and hot impact test link;
wherein, the initial performance test link comprises the following steps:
controlling the engine to carry out a running-in test according to a running-in standard, and prompting to replace engine oil after the running-in test is finished;
controlling the engine to operate at a preset rotating speed and a preset load so as to increase the water outlet temperature and the engine oil temperature of the engine;
when the water outlet temperature of the engine reaches a first preset temperature and the engine oil temperature reaches a second preset temperature, controlling the engine to perform initial performance tests, wherein the initial performance tests comprise an external characteristic test and a universal characteristic test.
3. The method of claim 2, wherein the low cycle fatigue reliability testing method further comprises a retest performance testing stage, the retest performance testing stage following the cold thermal shock testing stage;
wherein, the retest performance test link comprises the following steps:
and controlling the engine to perform retest performance tests, wherein the retest performance tests comprise the external characteristic test and the universal characteristic test.
4. The low-cycle fatigue reliability test device is characterized by comprising a rack water constant temperature system, wherein the rack water constant temperature system is used for carrying out a cold and hot impact test, the rack water constant temperature system comprises a thermal impact control system and a cold impact control system, the cycle of the low-cycle fatigue reliability test is defined as 360s, a temperature rise section is 180s, and a temperature drop section is 180 s:
the thermal shock control system is used for controlling the full-speed and full-load operation of the engine within a first preset working condition time;
the cold impact control system is used for controlling the engine to run at an idle speed and without load within a second preset working condition time;
the first preset working condition time comprises: a first sub-phase time, a second sub-phase time, and a third sub-phase time, wherein the rapid ramp-up of the engine speed and load to full speed full load during the ramp-up period 180s comprises:
the first sub-stage time is 10S, and the rotating speed and the load of the engine are increased within the first sub-stage time so as to run to a full-speed full-load working condition;
the second sub-stage time is 20S, and the temperature of the cooling liquid is controlled to rise to the first working condition temperature in the second sub-stage time;
the third sub-phase time is 150S, and the engine is controlled to keep operating at the full-speed full-load working condition at the first working condition temperature in the third sub-phase time;
the second preset working condition time comprises: a fourth sub-phase time, a fifth sub-phase time, and a sixth sub-phase time, wherein, during a cool-down period 180s, controlling the engine to idle unloaded comprises:
the fourth sub-phase time is 10S, and the rotating speed and the load of the engine are reduced within the fourth sub-phase time so as to run to an idling no-load working condition;
the fifth sub-stage time is 20S, and the temperature of the cooling liquid is controlled to be reduced to the second working condition temperature in the fifth sub-stage time;
and the sixth sub-phase time is 150S, and the engine is controlled to keep the idling no-load working condition running at the second working condition temperature in the sixth sub-phase time.
5. The apparatus of claim 4, wherein said low cycle fatigue reliability testing apparatus further comprises a three-way solenoid valve; the thermal shock control system comprises a hot water tank and a first circulating water pump;
the thermal shock control system is further used for controlling the hot water end of the three-way electromagnetic valve to be opened when the engine runs to full speed, hot water is filled into the engine through the first circulating water pump, and the outlet water temperature of the engine is increased to the first working condition temperature.
6. The apparatus of claim 5, wherein the cold shock control system comprises a cold water tank and a second circulating water pump;
and the cold impact control system is also used for controlling the cold water end of the three-way electromagnetic valve to be opened when the engine runs to an idle speed, and cold water is filled into the engine through the second circulating water pump, so that the temperature of the water outlet of the engine is reduced to a second working condition temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910806101.0A CN110579419B (en) | 2019-08-28 | 2019-08-28 | Low cycle fatigue reliability test method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910806101.0A CN110579419B (en) | 2019-08-28 | 2019-08-28 | Low cycle fatigue reliability test method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110579419A CN110579419A (en) | 2019-12-17 |
| CN110579419B true CN110579419B (en) | 2021-07-13 |
Family
ID=68812265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910806101.0A Active CN110579419B (en) | 2019-08-28 | 2019-08-28 | Low cycle fatigue reliability test method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110579419B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114705442B (en) * | 2022-06-06 | 2022-08-19 | 江铃汽车股份有限公司 | Comprehensive fatigue endurance test method for automobile engine |
Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2855801A (en) * | 1954-11-02 | 1958-10-14 | Int Harvester Co | Fatigue testing machine |
| CN1038696A (en) * | 1988-02-04 | 1990-01-10 | 西屋电气公司 | Turbine blade fatigue monitor |
| CN1050744A (en) * | 1989-10-04 | 1991-04-17 | 通用电气公司 | The alloy product of high strength, fatigue crack-resistant and method for making thereof |
| US5967660A (en) * | 1997-06-06 | 1999-10-19 | Ford Global Technologies, Inc. | Accelerated thermal fatigue testing of engine combustion chambers |
| CN2404115Y (en) * | 1999-12-02 | 2000-11-01 | 江苏法尔胜技术开发中心 | Variable load, impact low-periodic fatigue testing machine |
| CN2583113Y (en) * | 2002-12-13 | 2003-10-29 | 中国科学院金属研究所 | Single crystal high temperature alloy electric field unidirectional solidification equipment |
| CN1508297A (en) * | 2002-12-13 | 2004-06-30 | 中国科学院金属研究所 | Monocrystal high temperature alloy electric field directional freeze apparatus |
| JP2004324598A (en) * | 2003-04-28 | 2004-11-18 | Mazda Motor Corp | Breaking prediction method and breaking prediction system for engine parts, and its control program |
| US6935187B1 (en) * | 2004-03-03 | 2005-08-30 | General Electric Company | Test method for assessing thermal mechanical fatigue performance of a test material |
| CN1793819A (en) * | 2005-12-30 | 2006-06-28 | 北京理工大学 | Self-circulation fatigue experimental bench for turbocharger |
| CN201032475Y (en) * | 2006-11-29 | 2008-03-05 | 广西玉柴机器股份有限公司 | Engine deepness cold-hot shock test platform |
| CN201149544Y (en) * | 2007-12-10 | 2008-11-12 | 广西玉柴机器股份有限公司 | Platform for testing characteristics of multifunctional engine thermostat |
| CN101672749A (en) * | 2009-09-28 | 2010-03-17 | 北京航空航天大学 | Test device for surface deformation and material and test method thereof |
| CN202928913U (en) * | 2012-11-07 | 2013-05-08 | 北京有色金属研究总院 | Electrothermal alloy quick service life test device |
| CN103674753A (en) * | 2013-12-09 | 2014-03-26 | 昆明理工大学 | Test platform for thermal shock and thermal fatigue |
| CN203732277U (en) * | 2014-02-28 | 2014-07-23 | 武汉东测科技有限责任公司 | Depth cold and hot impact testing system of medium-heavy diesel engine |
| CN104018027A (en) * | 2014-05-09 | 2014-09-03 | 中国科学院金属研究所 | Novel heat-resisting titanium alloy and processing and manufacturing method and application thereof |
| CN104266840A (en) * | 2014-10-11 | 2015-01-07 | 中国第一汽车股份有限公司 | Deep thermal shock testing device of heavy-duty engine |
| CN205749099U (en) * | 2016-06-15 | 2016-11-30 | 武汉钢铁股份有限公司 | The anti-flexion device of flat cold-rolled sheet low cycle fatigue test |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1653050A1 (en) * | 2004-10-29 | 2006-05-03 | Siemens Aktiengesellschaft | Method of determining a characteristic value reflecting the state of fatigue of a component |
| CN102072013B (en) * | 2009-05-11 | 2014-02-12 | 洪选民 | Internal combustion engine design |
| CN103091189B (en) * | 2013-01-10 | 2014-09-24 | 湘潭大学 | Tester for simulating service environment of thermal barrier coating and detecting failure of thermal barrier coating in real time |
| CN204165753U (en) * | 2014-10-16 | 2015-02-18 | 凯迈(洛阳)机电有限公司 | A kind of engine cold thermal shock device |
| CN104458238B (en) * | 2014-12-15 | 2017-05-17 | 北京理工大学 | Self-circulating type test bed for turbocharger high-low temperature cycling thermal shock testing |
| CN109283321B (en) * | 2018-09-30 | 2020-06-23 | 安徽江淮汽车集团股份有限公司 | Engine lubricating oil change period evaluation method |
-
2019
- 2019-08-28 CN CN201910806101.0A patent/CN110579419B/en active Active
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2855801A (en) * | 1954-11-02 | 1958-10-14 | Int Harvester Co | Fatigue testing machine |
| CN1038696A (en) * | 1988-02-04 | 1990-01-10 | 西屋电气公司 | Turbine blade fatigue monitor |
| CN1050744A (en) * | 1989-10-04 | 1991-04-17 | 通用电气公司 | The alloy product of high strength, fatigue crack-resistant and method for making thereof |
| US5967660A (en) * | 1997-06-06 | 1999-10-19 | Ford Global Technologies, Inc. | Accelerated thermal fatigue testing of engine combustion chambers |
| CN2404115Y (en) * | 1999-12-02 | 2000-11-01 | 江苏法尔胜技术开发中心 | Variable load, impact low-periodic fatigue testing machine |
| CN2583113Y (en) * | 2002-12-13 | 2003-10-29 | 中国科学院金属研究所 | Single crystal high temperature alloy electric field unidirectional solidification equipment |
| CN1508297A (en) * | 2002-12-13 | 2004-06-30 | 中国科学院金属研究所 | Monocrystal high temperature alloy electric field directional freeze apparatus |
| JP2004324598A (en) * | 2003-04-28 | 2004-11-18 | Mazda Motor Corp | Breaking prediction method and breaking prediction system for engine parts, and its control program |
| US6935187B1 (en) * | 2004-03-03 | 2005-08-30 | General Electric Company | Test method for assessing thermal mechanical fatigue performance of a test material |
| CN1793819A (en) * | 2005-12-30 | 2006-06-28 | 北京理工大学 | Self-circulation fatigue experimental bench for turbocharger |
| CN201032475Y (en) * | 2006-11-29 | 2008-03-05 | 广西玉柴机器股份有限公司 | Engine deepness cold-hot shock test platform |
| CN201149544Y (en) * | 2007-12-10 | 2008-11-12 | 广西玉柴机器股份有限公司 | Platform for testing characteristics of multifunctional engine thermostat |
| CN101672749A (en) * | 2009-09-28 | 2010-03-17 | 北京航空航天大学 | Test device for surface deformation and material and test method thereof |
| CN202928913U (en) * | 2012-11-07 | 2013-05-08 | 北京有色金属研究总院 | Electrothermal alloy quick service life test device |
| CN103674753A (en) * | 2013-12-09 | 2014-03-26 | 昆明理工大学 | Test platform for thermal shock and thermal fatigue |
| CN203732277U (en) * | 2014-02-28 | 2014-07-23 | 武汉东测科技有限责任公司 | Depth cold and hot impact testing system of medium-heavy diesel engine |
| CN104018027A (en) * | 2014-05-09 | 2014-09-03 | 中国科学院金属研究所 | Novel heat-resisting titanium alloy and processing and manufacturing method and application thereof |
| CN104266840A (en) * | 2014-10-11 | 2015-01-07 | 中国第一汽车股份有限公司 | Deep thermal shock testing device of heavy-duty engine |
| CN205749099U (en) * | 2016-06-15 | 2016-11-30 | 武汉钢铁股份有限公司 | The anti-flexion device of flat cold-rolled sheet low cycle fatigue test |
Non-Patent Citations (1)
| Title |
|---|
| Material Characterization and Low Cycle Fatigue Model of Low Ag Content Lead-Free Solder;Fa Xing Che;《IEEE Transactions on Device and Materials Reliability》;20170228;第17卷(第2期);第298-306页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110579419A (en) | 2019-12-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110274767B (en) | System reliability judging method, device, equipment and storage medium | |
| CN109598079B (en) | Cylinder head partition fatigue life prediction method | |
| CN110579419B (en) | Low cycle fatigue reliability test method and device | |
| Bova et al. | A dynamic nucleate-boiling model for CO2 reduction in internal combustion engines | |
| CN109766592B (en) | Method for designing chassis system of armored vehicle under altitude-variable working condition in plateau | |
| Moulin et al. | Modelling and control of the air system of a turbocharged gasoline engine | |
| JP2020204285A (en) | Fuel injection control device | |
| Ghasemi Zavaragh et al. | Experimental analysis and evaluation of thermostat effects on engine cooling system | |
| CN104696056B (en) | A kind of method of quick heat engine | |
| Hazime et al. | Lifetime assessment of cylinder heads for efficient heavy duty engines part II: Component-level application of advanced models for thermomechanical fatigue life prediction of lamellar graphite cast iron GJL250 and vermicular graphite cast iron GJV450 cylinder heads | |
| Karnik et al. | Effect of exhaust gas temperature limits on the peak power performance of a turbocharged gasoline engine | |
| Canova et al. | Model-based characterization and analysis of diesel engines with two-stage turbochargers | |
| Li et al. | Simulation and test research for integrated exhaust manifold and hot end durability | |
| Liu et al. | Influence of advanced technology for thermal management on SUV | |
| Grigoriadis et al. | Advanced turbocharger model for 1D ICE simulation-Part i | |
| CN111931328A (en) | Method for predicting working condition and service life stage of lithium ion battery for vehicle based on summer climate | |
| Wang et al. | Thermo-mechanical fatigue and life prediction of turbocharged engine cylinder head | |
| CN108801640A (en) | A kind of car engine temperature test method | |
| Leufven et al. | Engine test bench turbo mapping | |
| CN104713733B (en) | A kind of electronic controlled diesel test method | |
| Ito et al. | Development of high level modeling method for rapid modeling process | |
| CN114065571A (en) | Low-cycle fatigue life analysis method for engine cylinder cover model | |
| CN114962235B (en) | Control method and device of circulating water pump, electric control equipment and medium | |
| EP2110535B1 (en) | Method for controlling the temperature of the exhaust gas in an internal combustion engine | |
| Xu et al. | Thermal Management Development for a Dedicated Hybrid Engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |