CN112924369A - Large-scale model corrosion fatigue test system and method for ocean engineering structure - Google Patents
Large-scale model corrosion fatigue test system and method for ocean engineering structure Download PDFInfo
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Abstract
The invention discloses a large-scale model corrosion fatigue test system and a method for a marine engineering structure, wherein the system comprises a marine corrosion environment simulation unit, a sample clamp, a fatigue load loading unit and a corrosion band simulation unit, wherein the marine corrosion environment simulation unit comprises a seawater and corrosion band simulation device and a marine atmosphere simulation device, the sample clamp is arranged on the marine corrosion environment simulation unit, the fatigue load loading unit is arranged at the top of the marine corrosion environment simulation unit and extends to the upper part of a test piece, and the marine corrosion environment simulation unit is used for matching with the seawater and corrosion band simulation device and the marine atmosphere simulation device to realize real-time coupling of a corrosion environment and a fatigue load; and the test data measuring unit is used for realizing test data acquisition, enabling the test simulation environment to be closer to the real marine environment, and improving the simulation degree of the corrosion fatigue test of the marine engineering structure and the accuracy of fatigue life prediction.
Description
Technical Field
The invention belongs to the technical field of structural corrosion fatigue tests, and particularly relates to a device and a method for a large-scale node model corrosion fatigue test of an ocean engineering structure.
Background
The marine environment is the most severe natural corrosion environment, and marine engineering structures face double damages of corrosion and fatigue in the service process. When marine engineered structures are subjected to a combination of alternating loads (fatigue) and corrosive environments (corrosion), premature failure by cracking or breaking often occurs, referred to as "corrosion fatigue". The corrosion fatigue is not the simple superposition of simple corrosion damage and fatigue damage, and obvious coupling acceleration effect exists between the two kinds of damage. Thus, the "corrosion fatigue" is far more destructive than a single "corrosion" or "fatigue". Statistics show that nearly 90% of marine engineering structure failures are caused by corrosion, and corrosion fatigue accounts for nearly 30% of the total number of accidents. Thus, corrosion fatigue is common and hazardous in the field of marine engineering.
The development of the corrosion fatigue test is always the main method and means for researching the influence of corrosion fatigue behaviors, and is also the most direct and effective way for obtaining the structural fatigue performance (service life, crack initiation and propagation) in a corrosion environment. For a long time, the corrosion fatigue test has been carried out on many materials and small members due to the limitation of test conditions, means, and the like, and has many disadvantages. For example: the simulated corrosion environment is single, most of the simulated corrosion environments are single salt mist environments, single high-temperature or high-humidity environments and single artificial seawater or saline solution environments, and a test device capable of simulating complex and time-varying marine service environments does not exist. Secondly, the corrosion fatigue test carried out aiming at some large-scale structural members at present does not really realize the corrosion and fatigue coupling test, and the corrosion and fatigue are split and are called as the corrosion-fatigue interaction test.
For the ocean engineering structure, on one hand, the structure size is large, on the other hand, the ocean corrosion environment faced by the structure is very complex, the fatigue performance of the structure can be reflected more truly by developing a model test of a full scale or a model test close to the full scale, original test data closer to the reality can be provided for the structure fatigue resistance design, and therefore the structure fatigue resistance design and evaluation method is improved. However, the existing corrosion fatigue test devices, such as the corrosion fatigue test devices disclosed in patent documents CN101986224B, CN200972450Y, CN111855552A, etc., can only rely on an "environment box" to perform salt spray and/or seawater corrosion tests on the layer of a small-sized standard test piece, and for the marine engineering structure, on one hand, the structure scale is large, and on the other hand, the structure is not a "standard test piece", and the traditional "environment box" type corrosion fatigue test device cannot meet the test requirements for the marine engineering structure; in addition, the conventional marine structure corrosion fatigue test apparatus, such as CN111413266A and CN108414360A, for example, performs corrosion fatigue tests on mooring anchor chains and deep sea high-pressure three-point bending structures, on one hand, fails to fully simulate the service environment conditions of the marine structure, such as humidity, temperature, illumination, salt spray, seawater oxygen content, and ph value of the marine environment where the structure is located, and cannot dynamically adjust the environmental condition parameters.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a large-scale model corrosion fatigue test system and method for an ocean engineering structure, the complex ocean corrosion environment condition parameters required by the test, including humidity, temperature, illumination, salt spray, seawater oxygen content, pH value and the like, can be dynamically adjusted in real time according to the requirements of the test on corrosion acceleration rate, and are matched with a fatigue load loading unit to realize the real-time coupling of the corrosion environment and the fatigue load, and the test data acquisition is realized through a test data measuring unit. The corrosion environment simulated by the system is closer to the real marine corrosion environment, the simulation degree and the accuracy of the test are improved, the system is suitable for a large-scale structure (node) model test, the corrosion fatigue performance of a structure can be reflected more truly, the accuracy of the fatigue life prediction of the marine engineering structure is improved, and the limitation that the corrosion fatigue test of small-sized components and material layers is carried out only by virtue of an environment box for a long time is broken through.
In order to achieve the above object, according to one aspect of the present invention, there is provided a large-scale model corrosion fatigue test system for an oceanographic engineering structure, comprising:
the marine corrosion environment simulation unit comprises a seawater and corrosion zone simulation device and a marine atmosphere simulation device, provides environmental condition parameters such as humidity, temperature, illumination, salt spray, seawater oxygen content, pH value and the like for developing a large-scale model corrosion fatigue test of a marine engineering structure, and can dynamically adjust the environmental condition parameters in real time according to the requirement of the test on corrosion acceleration rate;
the sample clamp is arranged in the marine corrosion environment simulation unit and used for fixing a test piece in the marine corrosion environment simulation unit;
the fatigue load loading unit is arranged at the top of the marine corrosion environment simulation unit and extends to the upper part of the test piece, and is used for realizing real-time coupling of the corrosion environment and the fatigue load by matching with the seawater and corrosion zone simulation device and the marine atmosphere simulation device; and the number of the first and second groups,
and the test data measuring unit is used for realizing test data acquisition, so that the test simulation environment is closer to a real marine environment, and the simulation degree and accuracy of the test are improved.
Further, the seawater and erosion zone simulation device comprises:
the environmental box bottom plate, the environmental box side plate vertically connected with the environmental box bottom plate and the environmental box top plate vertically connected with the environmental box side plate form a closed chamber as an environmental chamber of a large-scale structural model test;
the seawater tank is arranged on the bottom plate of the environment tank, a water storage container is arranged outside the environment tank, corrosive solution is stored in the water storage container, and a water inlet pipe and a water outlet pipe are arranged between the water storage container and the seawater tank to jointly form a seawater corrosion environment of the test piece.
Furthermore, be equipped with the second water intake pipe on the inlet tube, it is equipped with first ooff valve and supercharging device with inlet tube UNICOM on it to extend and locate the sea water tank top, the tip is equipped with rotatable formula pressure water shower nozzle, and corrosive solution passes through the supercharging device pressure boost passes through rotatable formula pressure water shower nozzle sprays on the test piece for the spray impact corrosion effect that splashes that ocean engineering structure received in the district that splashes.
Furthermore, one end of the water outlet pipe is communicated with the water storage container, and the other end of the water outlet pipe is communicated with a first overflow pipe arranged in the seawater tank and forms a closed loop with the water inlet pipe;
a second water outlet pipeline is arranged on the water outlet pipe, one end of the second water outlet pipeline is communicated with the water outlet pipe through a fourth switch valve, and the other end of the second water outlet pipeline is communicated with a second overflow pipe arranged in the seawater tank;
the bottom of the seawater tank is provided with a third water outlet pipeline which is communicated with the water outlet pipe through a third switch valve;
the water outlet pipe and the second water outlet pipeline can dynamically adjust the liquid level height in the seawater tank, so that the simulation of marine corrosion environments in a splashing area, a tidal range area, a full immersion area and other multi-zone areas is realized.
Further, the marine atmosphere simulation apparatus includes:
locate the outside salt solution tank of environment case locates the inside salt solution atomizing pump of this salt solution tank, this salt solution tank pass through salt fog pipeline with locate the salt fog shower nozzle UNICOM on the environment roof.
Further, the marine atmosphere simulation apparatus includes:
and the at least one group of simulated sunlight ultraviolet lamp rows are arranged on the top plate of the environment box and are used for simulating the illumination environment in the ocean atmosphere.
Further, the marine atmosphere simulation apparatus includes:
and the at least one group of humidifying and dehumidifying devices are arranged on the top plate of the environment box and used for controlling the humidity in the environment box and simulating a high-humidity marine atmospheric environment.
Further, the marine corrosion environment simulation unit includes:
the seawater dissolved oxygen content adjusting device comprises an air bottle or an oxygen bottle, wherein the air bottle or the oxygen bottle is communicated with a seawater tank through an aeration pipeline, and the aeration pipeline is provided with a control valve.
Further, the fatigue load loading unit includes:
door-type fatigue load loading device, butt joint ring flange and actuator loading pole.
According to another aspect of the invention, a large-scale model corrosion fatigue test method for an ocean engineering structure is provided, which comprises the following steps:
s100: a sample penetrates through a seawater tank, a perforated hole is sealed and then is installed on a sample clamp, a gate type fatigue load loading device is controlled to move to the position above the sample, and an actuator loading rod and a butt joint flange plate are installed;
s200: injecting corrosive liquid into the seawater tank by adjusting a second switch valve, opening a salt spray nozzle to spray salt spray into the environment tank until the salt spray sedimentation amount is required, opening the environment tank heating device and the humidifying and dehumidifying device until the temperature and humidity required by the test are reached, opening the simulated sunlight ultraviolet lamp array to simulate ocean illumination parameters, providing corrosive environment conditions such as humidity, temperature, illumination, salt spray, seawater oxygen content, pH value and the like for the test piece, and dynamically adjusting the environmental condition parameters in real time according to the test requirement;
s300: the fatigue testing machine is opened to be matched with the fatigue load loading unit to realize the real-time coupling of the corrosion environment and the fatigue load, the test data acquisition is realized through the test data measuring unit, and the corrosion fatigue test of the large-scale model of the marine structure in different marine zones is completed.
Further, the corrosion fatigue tests for different marine zones included:
s201: injecting corrosive liquid into the seawater tank by adjusting the second switch valve until the liquid level reaches the vicinity of the second liquid level, wherein the T-shaped welding area of the large-scale model of the ocean engineering structure is in a simulated ocean atmosphere environment, so that the corrosion fatigue test of the structure in the ocean atmosphere area is completed;
s202: closing the second switch valve, opening the first switch valve and the supercharging device, spraying corrosive liquid to a T-shaped welding area of the large-scale model of the ocean engineering structure through the rotatable pressure water spray head, simulating the splash impact corrosion effect, and completing the corrosion fatigue test of the structure in the splash area;
s203: the dynamic adjustment between the first liquid level and the second liquid level is realized by opening or closing the second switch valve, the fourth switch valve and the fifth switch valve, and the corrosion fatigue test of the large-scale model of the ocean engineering structure in the tidal range area is simulated;
s204: and continuously injecting corrosive liquid into the seawater tank to a first liquid level, and completely immersing the T-shaped welding area of the large-scale model of the ocean engineering structure into the seawater environment to finish the corrosion fatigue test of the structure in the full immersion area.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. the system of the invention provides a set of devices capable of carrying out corrosion fatigue tests on large-scale models of ocean engineering structures. The parameters of the complex marine corrosion environment condition required by the test, including humidity, temperature, illumination, salt spray, oxygen content of seawater, pH value and the like, can be dynamically adjusted in real time according to the requirement of the test on corrosion acceleration multiplying power. The real-time coupling of the corrosion environment and the fatigue load is realized by matching with the fatigue load loading unit, and the test data acquisition is realized through the test data measuring unit. The corrosion environment simulated by the system is closer to the real marine corrosion environment, the simulation degree and the accuracy of the test are improved, the system is suitable for a large-scale structure (node) model test, the corrosion fatigue performance of a structure can be reflected more truly, the accuracy of the fatigue life prediction of the marine engineering structure is improved, and the limitation that the corrosion fatigue test of small-sized components and material layers is carried out only by virtue of an environment box for a long time is broken through.
2. The system can observe the test process in real time, can realize dynamic regulation of environmental condition parameters such as humidity, temperature, illumination, salt spray, seawater oxygen content, pH value and the like of the test system and load loading by operating the control panel, realizes closed-loop control of the corrosion fatigue test of the large-scale model of the ocean engineering structure, is more close to a real ocean corrosion environment, can comprehensively simulate a complex ocean service environment, breaks through the limitation of only simulating a single environmental parameter in the past, and provides powerful support for developing an accurate corrosion fatigue test.
3. According to the system, corrosive liquid (artificial seawater) can be injected into the seawater tank through the water inlet pipeline, dynamic adjustment of the liquid level in the seawater tank can be realized through the plurality of water outlet pipelines, simulation of multi-zone marine corrosion environments such as a marine atmosphere zone, a splashing zone, a tidal range zone, a full immersion zone and the like can be performed in the same device through adjustment and conversion, and a new way is provided for systematic research of corrosion fatigue of a marine engineering structure.
4. The system of the invention can adjust each corrosion environment parameter to realize the function of accelerating corrosion. Adjusting the oxygen flow through a control valve so as to adjust the dissolved oxygen content in the seawater; regulating the temperature of the seawater by a temperature sensing and heating device; detecting and controlling a heating device, a humidifying and dehumidifying device and a salt spray nozzle of the environment box through a temperature and humidity sensor so as to adjust the temperature, the humidity, the salt spray sedimentation amount and other parameters of the environment box; adjusting illumination parameters by simulating a sunlight ultraviolet lamp column; on the basis, the pH value and salinity of the corrosive solution (artificial seawater) can be set in advance to meet the requirements of simulating different corrosion acceleration rates.
5. The system of the invention provides a function of simulating sunlight ultraviolet irradiation, so that the simulated marine atmospheric environment is closer to the real condition, and the simulation of a marine corrosion zone of a marine structure is perfected.
6. The system can adjust and expand the fatigue load loading unit and the test data measuring unit according to test requirements, and realizes the test research on the fatigue performance and the characteristics of the marine engineering structure in a complex service environment by matching with different test monitoring and detecting means.
Drawings
FIG. 1 is a schematic overall structure diagram of a large-scale model corrosion fatigue test system for an ocean engineering structure according to an embodiment of the present invention;
FIG. 2 is a top view of a large scale model corrosion fatigue test system for an oceanographic engineering structure according to an embodiment of the present invention;
FIG. 3 is a side view of a large scale model corrosion fatigue testing system for an oceaneering structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a seawater and corrosion zone simulation apparatus of a large-scale model corrosion fatigue test system for an oceanographic engineering structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an ocean atmospheric salt spray simulation device of a large-scale model corrosion fatigue test system for an ocean engineering structure according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of the distribution of erosion zones in an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a sea chest in an embodiment of the present invention;
FIG. 8 is a schematic view of a mounting structure of a sea chest and a gasket according to an embodiment of the present invention;
FIG. 9 is a schematic view of a sealing structure after a seawater tank and a test piece are assembled in the embodiment of the invention;
FIG. 10 is a schematic view of an assembly structure of a seawater tank and a test piece in the embodiment of the invention;
FIG. 11 is a top view of the seawater tank and the test piece after assembly in the embodiment of the present invention;
FIG. 12 is a schematic structural view of a test piece mounting fixture in an embodiment of the present invention;
FIG. 13 is a schematic view of a supporting frame according to an embodiment of the present invention;
FIG. 14 is a view taken along line A of FIG. 13;
FIG. 15 is a schematic general flow chart of a large-scale model corrosion fatigue test method for an ocean engineering structure according to an embodiment of the present invention;
FIG. 16 is a schematic diagram of a test flow of different corrosion zones in a large-scale model corrosion fatigue test method for an ocean engineering structure according to an embodiment of the present invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-marine corrosion environment simulation unit;
11-seawater and corrosion zone simulation device, 111-environmental tank bottom plate, 112-environmental tank top plate, 113-environmental tank heating plate, 114-simulated sunlight ultraviolet lamp array, 115-temperature and humidity sensor, 116-seawater tank, 1161-upper part, 1162-lower part, 1163-bonding part, 117-water storage container, 118-corrosion solution, 119-circulating pump, 120-water inlet pipe, 121-iron rust filtering device, 122-first switch valve, 123-second switch valve, 124-supercharging device, 125-rotatable pressure water spray head, 126-first overflow pipe, 127-first liquid surface, 128-second liquid surface, 129-second overflow pipe, 130-temperature sensing and warming device, 131-third switch valve, 132-fourth switch valve, 133-a fifth switch valve, 134-a water outlet pipe, 135-an observation window, 136-a control panel, 137-an environmental box side plate, 138-a first cabin area, 139-a second cabin area and 140-an anchor point;
14-ocean atmosphere simulation device, 141-saline atomizing pump, 142-saline tank, 143-salt fog pipeline, 144-salt fog spray head and 145-humidifying and dehumidifying device;
15-dissolved oxygen content adjusting device, 151-air bottle or oxygen bottle, 152-control valve, 153-aeration pipeline;
16-ocean zone, 161-ocean atmosphere zone, 162-splash zone, 163-tidal range zone, 164-full dip zone;
2-fatigue load loading unit, 21-door type fatigue load loading device, 221-actuator loading rod and 222-butt joint flange plate;
3-sample clamp, 31-support frame, 32-sealing pad, 33-eye plate;
4-test piece, 41-chord member and 42-brace.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a large-scale model corrosion fatigue test system for an ocean engineering structure, which integrally includes an ocean corrosion environment simulation unit 1, a fatigue load loading unit 2, a sample clamp 3, and a test data measurement unit. The marine corrosion environment simulation unit 1 comprises a seawater and corrosion zone simulation device 11 and a marine atmosphere simulation device 14, provides environmental conditions such as humidity, temperature, illumination, salt spray, seawater oxygen content and pH value for developing a marine engineering structure large-scale model corrosion fatigue test, and can dynamically adjust the environmental condition parameters in real time according to the requirement of the test on corrosion acceleration rate. The real-time coupling of the corrosion environment and the fatigue load is realized by matching with the fatigue load loading unit, and the test data acquisition is realized through the test data measuring unit. The simulated corrosion environment is closer to the real marine corrosion environment, the simulation degree and the accuracy of the test are improved, the marine corrosion environment simulation unit 1 is applicable to the corrosion fatigue test of a large-scale model of a marine engineering structure, the scale ratio of a test piece is reduced, and therefore the scale effect problem caused by the large-scale model test is effectively solved. The system can more comprehensively evaluate the corrosion fatigue performance of the structure, improve the accuracy of predicting the fatigue life of the ocean engineering structure, and break through the limitation that the corrosion fatigue test of small components and material layers is carried out only by virtue of an environment box for a long time.
Preferably, as shown in fig. 2, in the embodiment of the present invention, the whole test system may be divided into a plurality of test bay areas, which are schematically divided into a first bay area 138 and a second bay area 139, and may be flexibly configured according to the test requirements. At least one set of test system can be set according to the demand in each cabin district, can carry out multiunit test simultaneously, improves test efficiency. The seawater and corrosive zone simulation device 11 comprises an environment box bottom plate 111, an environment box side plate 137 vertically connected with the environment box bottom plate 111, and an environment box top plate 112 vertically connected with the environment box side plate 137, wherein the three components jointly form a closed chamber which is used as an environment cabin of a large-scale structure (node) model test and used for simulating a marine corrosive environment. Preferably, as shown in fig. 1, at least one environmental box side plate 137 is provided with an observation window 135 and a control panel 136, the test process can be observed in real time through the observation window 135, and dynamic adjustment of environmental condition parameters such as humidity, temperature, illumination, salt spray, seawater oxygen content and pH value of the test system and load loading can be realized by operating the control panel 136, so that closed-loop control of a large-scale model corrosion fatigue test of a marine engineering structure is realized, the test system is closer to a real marine corrosion environment, a complex marine service environment can be comprehensively simulated, the limitation that only a single environmental parameter is simulated in the past is broken through, and powerful support is provided for developing an accurate corrosion fatigue test.
As shown in fig. 3, 4, 5-11, in an embodiment of the present invention, the seawater and erosion zone simulator 11 includes a seawater tank 116 disposed on the bottom plate 111 of the environmental chamber, the seawater tank 116 is made of transparent organic glass material and includes an upper portion 1161, a lower portion 1162 and an adhesive portion 1163 disposed therebetween, and the upper portion 1161 and the lower portion 1162 are hermetically connected by an adhesive. And a pair of side walls of the seawater tank 116 is provided with a through hole for the test piece 4 to pass through and be immersed in the seawater environment. A water storage container 117 is arranged outside the environmental tank, corrosive solution (artificial seawater) 118 is stored in the water storage container, a water inlet pipe 120 and a water outlet pipe 134 are arranged between the water storage container 117 and the seawater tank 116, wherein one end of the water inlet pipe 120 extends into the water storage container 117, a circulating pump 119 is arranged at the bottom of the water inlet pipe, the other end of the water inlet pipe extends into the seawater tank 116 after passing through a second switch valve 123, and the water inlet pipe 120 is used for driving the corrosive solution 118 in the water storage container 117 to enter the seawater tank 116 through the circulating pump 119. In addition, the water inlet pipe 120 is further provided with a rust filtering device 121 for filtering impurities such as rust generated in the circulation process of the corrosive solution 118, so that the relative stability of the components of the corrosive solution 118 is ensured, and the test error is reduced. Preferably, as shown in fig. 3 and 4, a second water inlet pipeline is arranged on the water inlet pipe 120, and is communicated with the water inlet pipe 120, a first switch valve 122 and a pressure boosting device 124 are arranged on the water inlet pipe, and extend to the top of the sea water tank 116, and a rotatable pressure water nozzle 125 is arranged at the end of the water inlet pipe, so that the corrosive solution 118 is pressurized by the pressure boosting device 124 and then is sprayed onto the test piece 4 through the rotatable pressure water nozzle 125, and the test piece is used for simulating the spray splashing impact corrosion action of the oceanographic engineering structure in the splashing area, thereby more comprehensively simulating the corrosion environment of the oceanographic engineering structure in the sea water, and improving the accuracy and the simulation degree of.
In addition, as shown in fig. 3 and fig. 12 to 14, a sample clamp 3 is disposed in the environmental chamber, the sample clamp 3 includes a support frame 31 and an eye plate 33 disposed at the top thereof, the sample 4 includes a chord 41 and a brace 42 perpendicular thereto, a plurality of anchor points 140 are disposed at the bottom of the environmental chamber for matching and fixedly connecting with the support frame 31, the chord 41 passes through openings of two side walls of the seawater chamber 116, and two ends of the chord 41 are fixedly connected with the eye plate 33 respectively, so that the sample 4 is fixed in the environmental chamber. In addition, a sealing gasket 32 is arranged at an opening of the chord member 41 penetrating through the seawater tank 116, so that the test piece 4 is hermetically connected with the seawater tank 116, and the T-shaped welding zone (research target zone) of the test piece 4 is placed in seawater in the seawater tank 116.
In addition, as shown in fig. 3, at least one marine atmosphere simulation device 14 is disposed inside and outside the environmental chamber, and includes a brine tank 142, a salt water atomizing pump 141 disposed inside the brine tank 142, the brine tank 142 is communicated with a salt mist nozzle 144 disposed on the top plate 112 of the environmental chamber through a salt mist pipeline 143, and the salt water in the brine tank 142 is atomized by the salt water atomizing pump 141 and sprayed into the environmental chamber through the salt mist nozzle 144 to simulate the salt mist environment of the marine atmosphere. Preferably, at least one set of simulated solar ultraviolet lamp arrays 114 are provided on the environmental chamber ceiling 112 to provide simulated solar ultraviolet radiation. Preferably, at least one group of humidifying and dehumidifying devices 145 are arranged on the top plate 112 of the environment box and used for adjusting the humidity of the environment box, so that the simulated marine atmospheric environment is closer to the real condition, and the simulation of the marine corrosion zone of the marine structure is perfected.
As shown in fig. 6, the marine structure is subjected to different marine corrosive environments when it is above, near and fully immersed in sea water, and we therefore divide it into four different marine corrosive zones, as shown in table 1:
TABLE 1 marine corrosion zone distribution chart
Preferably, as shown in fig. 3 and 4, in one embodiment of the present invention, the outlet pipe 134 is connected to the water storage container 117 at one end and to the first overflow pipe 126 disposed in the sea water tank 116 at the other end, and forms a closed loop with the inlet pipe 120. In addition, a second water outlet pipeline is arranged on the water outlet pipe 134, one end of the second water outlet pipeline is communicated with the water outlet pipe 134 through a fourth switch valve 132, the other end of the second water outlet pipeline is communicated with a second overflow pipe 129 arranged in the seawater tank 116, and a fifth switch valve 133 is arranged at one side, close to the water storage container 117, of the position where the water outlet pipe 134 is communicated with the water outlet pipeline. In addition, the bottom of the sea chest 116 is provided with a third water outlet pipeline, which is communicated with the water outlet pipe 134 through a third on-off valve 131, and is used for discharging the liquid in the sea chest 116 after the test is finished. Corrosive liquid 118 may be injected into seawater tank 116 through two inlet lines, and the second inlet line may simulate the spray load effect. Meanwhile, the dynamic adjustment of the liquid level in the seawater tank 116 can be realized through the first overflow pipe 126, the second overflow pipe 129 and the corresponding water outlet pipelines, and the corrosion fatigue test of marine structures under various marine corrosion zones such as the splash zone 162, the tidal range zone 163 and the full immersion zone 164 is realized. Preferably, as shown in fig. 3 and 4, the seawater tank 116 is provided with a temperature sensing and warming device 130 at the bottom thereof for monitoring the temperature of the corrosive liquid 118 and ensuring that the temperature of the corrosive solution is within a predetermined range of the test.
In a preferred embodiment of the present invention, as shown in fig. 3 and 4, the marine corrosion environment simulation unit 1 further comprises a dissolved oxygen content adjusting device 15, which comprises an air bottle or an oxygen bottle 151, the air bottle or the oxygen bottle 151 is communicated with the sea water tank 116 through an aeration pipeline 153, and a control valve 152 is arranged on the aeration pipeline 153. If the corrosion speed needs to be increased, the aeration flow can be adjusted through the control valve 152, so as to adjust the dissolved oxygen content in the seawater, and meanwhile, the temperature parameter of the corrosive liquid 118 is adjusted through the temperature sensing and warming device 130; the temperature and humidity sensor 115 detects and controls the environment box heating device 113, the humidifying and dehumidifying device 145 and the salt spray nozzle 144 to adjust the temperature, the humidity, the salt spray sedimentation amount and other parameters of the environment box; the simulation of the accelerated corrosive environment is achieved by adjusting the illumination parameters through the simulated solar ultraviolet lamp string 114.
Further, as shown in fig. 1, 3 and 4, the testing system of the embodiment of the present invention further includes a fatigue load loading unit 2, which includes a door type fatigue load loading device 21, an actuator loading rod 221 and a docking flange 222. The door type fatigue load loading device 21 can move to a proper position along the marine corrosion environment simulation unit 1, and drives the actuator loading rod 221 through a fatigue testing machine, so that the fatigue load of the test piece 4 is applied, and the fatigue load of the marine engineering structure is simulated.
As shown in fig. 15, another embodiment of the present invention provides a large-scale model corrosion fatigue test method for an ocean engineering structure, which includes the following steps:
s100: the sample 4 penetrates through the seawater tank 116, the perforated part is sealed and then is installed on the sample clamp 3, the gate type fatigue load loading device 21 is controlled to move to the position above the sample 4, and an actuator loading rod 221 and a butt flange 222 are installed;
s200: injecting corrosive liquid (artificial seawater) 118 into the seawater tank 116 by adjusting the second switch valve 123, simultaneously opening the salt spray nozzle 144 to spray salt spray into the environment tank until the required salt spray settling amount is reached, opening the environment tank heating device 113, the humidifying and dehumidifying device 145 until the temperature and the humidity required by the test are reached, opening the simulated sunlight ultraviolet lamp array 114 to simulate ocean illumination parameters, providing corrosion environment conditions such as humidity, temperature, illumination, salt spray, seawater oxygen content, pH value and the like for the test piece 4, and dynamically adjusting the environment condition parameters in real time according to the test requirements;
s300: the fatigue testing machine is opened to be matched with the fatigue load loading unit to realize the real-time coupling of the corrosion environment and the fatigue load, the test data acquisition is realized through the test data measuring unit, and the corrosion fatigue test of the large-scale model of the marine structure in different marine zones is completed.
As shown in fig. 16, in the embodiment of the present invention, step S200 includes:
s201: injecting corrosive liquid 118 into the seawater tank 116 by adjusting the second switch valve 123 until the liquid level reaches the vicinity of the second liquid level 128, soaking a part of the test piece 4 in a seawater environment, and exposing the other part of the test piece to the atmospheric environment irradiated by salt spray and a sunlight ultraviolet lamp line, namely, a T-shaped welding area (a research target area) of the large-scale model of the ocean engineering structure is positioned in an ocean atmospheric area 161, so as to complete the corrosion fatigue test of the structure in the ocean atmospheric area;
s202: closing the second switch valve 123, opening the first switch valve 122 and the supercharging device 124, spraying corrosive liquid 118 to a T-shaped welding area of a large-scale model of the ocean engineering structure through a rotatable pressure water spray head 125, simulating a spray splashing impact corrosion effect, and completing a corrosion fatigue test of the structure in a splashing area;
s203: by opening or closing the second switch valve 123, the fourth switch valve 132 and the fifth switch valve 133, the dynamic adjustment between the first liquid level 127 and the second liquid level 128 is realized, and the corrosion fatigue test of a large-scale model of the ocean engineering structure in a tidal range region is simulated;
s204: when the liquid level in the seawater tank 116 is relatively high, namely the first liquid level 127 shown in the figure, the T-shaped welding area of the large-scale model of the ocean engineering structure is completely immersed in the seawater environment, and the corrosion fatigue test of the structure in the full immersion area is completed.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A large-scale model corrosion fatigue test system of ocean engineering structure is characterized by comprising:
the marine corrosion environment simulation unit comprises a seawater and corrosion zone simulation device and a marine atmosphere simulation device, provides environmental condition parameters of humidity, temperature, illumination, salt spray, seawater oxygen content and pH value for developing a large-scale model corrosion fatigue test of a marine engineering structure, and can dynamically adjust the environmental condition parameters in real time according to the requirement of the test on corrosion acceleration rate;
the sample clamp is arranged in the marine corrosion environment simulation unit and used for fixing a test piece in the marine corrosion environment simulation unit;
the fatigue load loading unit is arranged at the top of the marine corrosion environment simulation unit and extends to the upper part of the test piece, and is used for realizing real-time coupling of the corrosion environment and the fatigue load by matching with the seawater and corrosion zone simulation device and the marine atmosphere simulation device; and the number of the first and second groups,
and the test data measuring unit is used for realizing test data acquisition, so that the test simulation environment is closer to a real marine environment, and the simulation degree and accuracy of the test are improved.
2. The large scale model corrosion fatigue test system for oceanographic engineering structure of claim 1, wherein the seawater and corrosion zone simulator comprises:
the environmental box bottom plate, the environmental box side plate vertically connected with the environmental box bottom plate and the environmental box top plate vertically connected with the environmental box side plate form a closed chamber as an environmental chamber of a large-scale structural model test;
the seawater tank is arranged on the bottom plate of the environment tank, a water storage container is arranged outside the environment tank, corrosive solution is stored in the water storage container, and a water inlet pipe and a water outlet pipe are arranged between the water storage container and the seawater tank to jointly form a seawater corrosion environment of the test piece.
3. The large-scale model corrosion fatigue test system for ocean engineering structures according to claim 2, wherein the water inlet pipe is provided with a second water inlet pipeline which is communicated with the water inlet pipe, is provided with a first switch valve and a pressurizing device and extends to the top of the seawater tank, and the end part of the water inlet pipe is provided with a rotatable pressure water nozzle, and the corrosive solution is pressurized by the pressurizing device and is sprayed on the test piece through the rotatable pressure water nozzle to simulate the spray splash impact corrosion action of the ocean engineering structures in the splash zone.
4. The large-scale model corrosion fatigue test system for ocean engineering structures according to claim 2, wherein one end of the water outlet pipe is communicated with the water storage container, and the other end of the water outlet pipe is communicated with a first overflow pipe arranged in the seawater tank and forms a closed loop with the water inlet pipe;
a second water outlet pipeline is arranged on the water outlet pipe, one end of the second water outlet pipeline is communicated with the water outlet pipe through a fourth switch valve, and the other end of the second water outlet pipeline is communicated with a second overflow pipe arranged in the seawater tank;
the bottom of the seawater tank is provided with a third water outlet pipeline which is communicated with the water outlet pipe through a third switch valve;
the water outlet pipe and the second water outlet pipeline can dynamically adjust the liquid level height in the seawater tank, so that the simulation of marine corrosion environments in a splashing area, a tidal range area and a full immersion area can be realized.
5. The large-scale model corrosion fatigue test system for oceanographic engineering structures according to any one of claims 2-4, wherein the oceanographic atmosphere simulation device comprises:
locate the outside salt solution tank of environment case locates the inside salt solution atomizing pump of this salt solution tank, this salt solution tank pass through salt fog pipeline with locate the salt fog shower nozzle UNICOM on the environment roof.
6. The large scale model corrosion fatigue test system for oceanographic engineering structures of claim 5, wherein the oceanographic atmosphere simulation device comprises:
the at least one group of simulated sunlight ultraviolet lamp rows are arranged on the top plate of the environment box and used for simulating the illumination environment in the ocean atmosphere;
and the at least one group of humidifying and dehumidifying devices are arranged on the top plate of the environment box and used for controlling the humidity in the environment box and simulating a high-humidity marine atmospheric environment.
7. The large-scale model corrosion fatigue test system for marine engineering structures according to any one of claims 1-6, wherein the marine corrosion environment simulation unit comprises:
the seawater dissolved oxygen content adjusting device comprises an air bottle or an oxygen bottle, wherein the air bottle or the oxygen bottle is communicated with a seawater tank through an aeration pipeline, and the aeration pipeline is provided with a control valve.
8. The large-scale model corrosion fatigue test system for oceanographic engineering structures according to any one of claims 1-6, wherein the fatigue load loading unit comprises:
door-type fatigue load loading device, butt joint ring flange and actuator loading pole.
9. A large-scale model corrosion fatigue test method of an ocean engineering structure is characterized by comprising the following steps:
s100: a sample penetrates through a seawater tank, a perforated hole is sealed and then is installed on a sample clamp, a gate type fatigue load loading device is controlled to move to the position above the sample, and an actuator loading rod and a butt joint flange plate are installed;
s200: injecting corrosive liquid into the seawater tank by adjusting a second switch valve, opening a salt spray nozzle to spray salt spray into the environment tank until the salt spray sedimentation amount is required, opening the environment tank heating device and the humidifying and dehumidifying device until the temperature and humidity required by the test are reached, opening the simulated sunlight ultraviolet lamp array to simulate ocean illumination parameters, providing humidity, temperature, illumination, salt spray, seawater oxygen content and pH value corrosion environment condition parameters for the test piece, and dynamically adjusting the environment condition parameters in real time according to the test requirement;
s300: the fatigue testing machine is opened to be matched with the fatigue load loading unit to realize the real-time coupling of the corrosion environment and the fatigue load, the test data acquisition is realized through the test data measuring unit, and the corrosion fatigue test of the large-scale model of the marine structure in different marine zones is completed.
10. The method for testing corrosion fatigue of large-scale model of marine engineering structure according to claim 9, wherein the corrosion fatigue test of different marine bands comprises:
s201: injecting corrosive liquid into the seawater tank by adjusting the second switch valve until the liquid level reaches the vicinity of the second liquid level, wherein the T-shaped welding area of the large-scale model of the ocean engineering structure is in a simulated ocean atmosphere environment, so that the corrosion fatigue test of the structure in the ocean atmosphere area is completed;
s202: closing the second switch valve, opening the first switch valve and the supercharging device, spraying corrosive liquid to a T-shaped welding area of the large-scale model of the ocean engineering structure through the rotatable pressure water spray head, simulating the splash impact corrosion effect, and completing the corrosion fatigue test of the structure in the splash area;
s203: the dynamic adjustment between the first liquid level and the second liquid level is realized by opening or closing the second switch valve, the fourth switch valve and the fifth switch valve, and the corrosion fatigue test of the large-scale model of the ocean engineering structure in the tidal range area is simulated;
s204: and continuously injecting corrosive liquid into the seawater tank to a first liquid level, and completely immersing the T-shaped welding area of the large-scale model of the ocean engineering structure into the seawater environment to finish the corrosion fatigue test of the structure in the full immersion area.
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