CN110849703A - Mechanical property testing device, equipment and method - Google Patents
Mechanical property testing device, equipment and method Download PDFInfo
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- CN110849703A CN110849703A CN201911337469.3A CN201911337469A CN110849703A CN 110849703 A CN110849703 A CN 110849703A CN 201911337469 A CN201911337469 A CN 201911337469A CN 110849703 A CN110849703 A CN 110849703A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 23
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- 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
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- 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
- G01N3/02—Details
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- 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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- 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
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- 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
- G01N2203/0075—Strain-stress relations or elastic constants
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- 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
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- G01N2203/0222—Temperature
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Abstract
The invention discloses a mechanical property testing device, equipment and a method, wherein the testing device comprises an upper beam and a lower beam; the testing device also comprises two guide posts and a sliding block; the two guide columns are arranged on the lower beam and can be connected with the upper beam in a sliding fit manner; the guide column is made of a carbon fiber reinforced polyimide composite material; the two sliding blocks can be arranged at the upper end of the lower beam in a relatively sliding manner, and a lower pressing roller in rotating fit with the sliding blocks is arranged on the sliding blocks; the lower end of the middle part of the upper beam is detachably provided with an upper pressing block, and the lower end of the upper pressing block is provided with an upper pressing roller which is in running fit with the upper pressing block. Under the action of the guide column made of the carbon fiber reinforced polyimide composite material, the problem of reduced testing precision caused by sliding blockage due to thermal expansion of the traditional metal guide column is effectively solved.
Description
Technical Field
The invention relates to the technical field of mechanical property testing of high-temperature-resistant resin matrix composite materials, in particular to a mechanical property testing device, equipment and method.
Background
The fiber reinforced resin matrix composite material system has high specific strength, high specific modulus and excellent fatigue resistance, and is widely applied to the fields of aviation, aerospace, automobiles and the like. However, as flight speeds continue to increase, the aircraft surface temperature also increases. In supersonic and hypersonic aircraft (Ma >3), aircraft surface temperatures can reach 400 ℃ and even higher. The traditional epoxy resin-based composite material cannot meet the design requirement, and more high-temperature-resistant resin-based composite materials are used in aerospace bearing structures. In the design process of an aircraft structure, the testing and characterization of the mechanical property of the material are necessary conditions for the optimization and strength check of the structure design.
In order to further expand the application of the high-temperature-resistant resin matrix composite system, the mechanical property test and characterization under the normal-temperature and high-temperature environments are necessary links. However, at present, no reliable mechanical property experimental equipment for the high-temperature resin matrix composite material exists in a high-temperature environment. If adopt traditional experimental facilities to be used for testing the mechanical properties of material under the high temperature condition, the guide post in the experimental facilities is because thermal expansion, and shaft hole clearance fit diminishes, and the effect of direction can not effectively be played in the slip jam, and thermal expansion produces frictional force and greatly influences the experiment precision. In addition, the rigidity and strength of the guide column made of the traditional stainless steel material are obviously reduced under the influence of high temperature of the environment, and the guide column cannot play a role in positioning, guiding and rigidity enhancing. In a damp and hot environment, the guide column rusts due to the existence of water vapor, and the condition that the experimental equipment is damaged seriously often happens.
Disclosure of Invention
The invention provides a mechanical property testing device, equipment and a method, which make up the blank of high-temperature mechanical property testing of a high-temperature resistant resin matrix composite material, solve the difficulty of using a normal-temperature experimental device under a high-temperature condition, greatly improve the precision and reliability of a high-temperature experiment, and provide necessary support for the application of the high-temperature resin matrix structural composite material.
In order to achieve the purpose, the invention adopts the following technical scheme: a mechanical property testing device comprises an upper beam and a lower beam; the test device further comprises:
the two guide columns are arranged on the lower beam and are connected with the upper beam in a sliding fit manner; the guide column is made of a carbon fiber reinforced polyimide composite material;
the two sliding blocks can be arranged at the upper end of the lower beam in a relatively sliding manner, and a lower pressing roller in rotating fit with the sliding blocks is arranged on the sliding blocks;
the lower end of the middle part of the upper beam is detachably provided with an upper pressing block, and the lower end of the upper pressing block is provided with an upper pressing roller which is in running fit with the upper pressing block.
As a further description of the above technical solution:
the carbon fiber reinforced polyimide guide column is formed by winding, curing and molding carbon fiber monofilaments after the carbon fiber monofilaments are immersed in polyimide resin; the carbon fiber monofilaments are T700, T800, T1000, M40J or M55J carbon fiber monofilaments; the polyimide resin is a thermosetting polyimide resin with a glass transition temperature of more than 450 ℃.
As a further description of the above technical solution:
and the carbon fiber reinforced polyimide guide column is sprayed with a ceramic nano coating of 0.5 mm.
As a further description of the above technical solution:
the lower beam is provided with sliding grooves, and the two sliding blocks are provided with first bolts which penetrate through the sliding grooves to be locked on the lower beam.
As a further description of the above technical solution:
the upper part of the sliding block is provided with a semicircular groove matched with the lower compression roller, and the lower compression roller is rotatably fixed on the sliding block through a bracket; the side of slider is equipped with the locating plate, the locating plate is higher than the slider, it has the slot hole to open on the locating plate, the locating plate with the slider passes slot hole slidable connection through the second screw.
As a further description of the above technical solution:
the lower part of the upper pressing block is provided with a semicircular groove matched with the upper pressing roller, the upper pressing roller is rotatably fixed on the upper pressing block through a mounting frame, and the radius R of the upper pressing roller is 3mm, 25mm and 50mm respectively; the upper end of the upper beam is detachably provided with a conversion section.
As a further description of the above technical solution:
the upper end of the guide post is provided with a stop block for preventing the upper beam from sliding out of the guide post, and the stop block is a bolt.
A mechanical property testing device comprises an experiment machine and the mechanical property testing device.
As a further description of the above technical solution: the experimental machine comprises a lower push pier, a temperature control box, a controller and a centering rotation prevention device.
A test method of the mechanical property test equipment comprises the following steps:
in the first step, the sample size, the span between the two lower press rolls and the diameter of the upper press roll are selected according to experimental requirements.
And secondly, placing the test sample in the mechanical property testing device, placing the whole testing device on the experiment machine, and adjusting the testing device to ensure the base to be horizontal.
And thirdly, mounting the centering rotation preventer on the lower push pier, and then centering and adjusting the test sample to realize centering of the test device on the test machine.
And fourthly, operating the controller to carry out mechanical property test experiment preparation work.
And fifthly, operating the temperature control box, and setting a temperature rise curve, a temperature rise rate and heat preservation time according to requirements.
And sixthly, starting the experiment machine to start loading after the environmental temperature reaches the preset requirement, starting displacement control, and recording loading time, displacement and force values.
And seventhly, operating the temperature control box after the loading is finished, taking out the testing device after the temperature is reduced to the room temperature, recording the damage condition of the sample and finishing data processing.
The invention has the following beneficial effects:
(1) under the action of the guide column made of the carbon fiber reinforced polyimide composite material, the problem of reduced testing precision caused by sliding blockage due to thermal expansion of the traditional metal guide column is effectively solved.
(2) The invention can be used for developing high-temperature three-point bending experiments, high-temperature short beam shearing experiments, damp-heat three-point bending experiments and damp-heat short beam shearing experiments of different materials and different temperatures, and is matched with different experiment machines to complete various mechanical experiments, thereby integrating multiple functions into one experiment device.
(3) The invention can realize the adjustment of the radius of the upper press roll by replacing the upper press block, can realize the adjustment of the span between the two lower press rolls by sliding the two slide blocks, and can select proper radius and span according to different material characteristics, thereby reducing the influence of an experimental device on the experimental precision and effectively acquiring the failure behavior of the material.
(4) The parts of the invention can be disassembled and replaced, the heating equipment adopts the temperature control box for heating, the equipment investment is less, and the manufacturing cost is low.
Drawings
FIG. 1 is a schematic structural diagram of a mechanical property testing device;
FIG. 2 is a schematic view of a positioning plate;
FIG. 3 is a schematic structural diagram of a mechanical property testing device;
FIG. 4 is a partial enlarged view of the mechanical property testing apparatus;
FIG. 5 is a working schematic diagram of mechanical property testing;
FIG. 6 is a view showing centering adjustment in the sample span direction;
fig. 7 is a view showing centering adjustment in the thickness direction of the sample.
In the figure: 1-a lower beam; 2-a second screw; 3-a scaffold; 4-pressing the roller; 5-upper press roll; 6-upper beam; 7-a mounting frame; 8-pressing the blocks; 9-a conversion section; 10-long holes; 11-a stop block; 13-a guide post; 14-sample; 15-positioning a plate; 16-a slide block; 17-a first bolt; 30-an experimental machine; 31-pushing down the pier; 32-a middle anti-rotation device; 33-temperature control box.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-2, one embodiment of the present invention is provided: a mechanical property testing device comprises an upper beam 6 and a lower beam 1; the testing device also comprises two guide posts 13 which are arranged on the lower beam 1 and can be in sliding fit connection with the upper beam 6; preferably, the blind ditch of the lower beam 1 faces downwards, the upper end of the lower beam 1 is provided with two positioning holes, the guide column 13 with the belt tightness of 0.01mm-0.039mm is pressed into the positioning hole of the lower beam 1 at the left and right sides, and is punched at four points around the positioning hole to avoid looseness; then, the upper beam 6 is provided with two guide holes, the guide holes are aligned to the two guide posts 13 assembled on the lower beam 1, and the guide posts 13 are sleeved on the upper beam from top to bottom to form a square frame structure, so that the rigidity is greatly increased. In order to prevent the upper beam 6 from sliding down from the guide column 13, a stop 11 is arranged at the upper end of the guide column 13, the stop 11 is a bolt, specifically, a threaded hole is arranged at the upper end of the guide column 13, and the bolt 11 is fixed on the threaded hole at the upper end of the guide column 13.
The guide post 13 integrates positioning, guiding and rigidity enhancing functions. Therefore, the three-point bending test device is necessary and necessary to be provided with a double-shaft guide structure.
The upper beam 6 and the lower beam 1 are relatively wide and thick, so that enough rigidity is ensured, and the torsional deformation can be avoided during loading.
In some embodiments, the present invention is to solve the problem that the guiding column 13 loses guiding and supporting functions due to the expansion of the metal guiding column caused by heat. The guide post 13 is prepared using a carbon fiber reinforced polyimide composite material. The carbon fiber reinforced polyimide guide column 13 is formed by winding and curing carbon fiber monofilaments immersed in polyimide resin, the selected polyimide resin has high glass transition temperature and low strength and modulus loss rate below 500 ℃, and can effectively provide a supporting effect for a testing device. The outer surface of the guide post 13 after the solidification is sprayed with a layer of ceramic nano coating with the thickness of about 0.5mm, so that the heat insulation effect can be effectively achieved, the thermal expansion coefficient of the guide post 13 can be greatly reduced, and the problem that the guide post cannot be guided and blocked due to thermal expansion is effectively solved. The composite material has good wet heat property, and the surface nano coating can effectively block water vapor, so that the service life of the guide column is greatly prolonged.
In some embodiments, carbon fibers with moderate strength and modulus are selected as the reinforcing material for the present invention to improve the stiffness of the guidepost 13 at high temperatures. T700, T800, T1000, M40J, M55J carbon fibers and the like can be selected according to different rigidity and strength requirements. Under the same conditions, M40J carbon fibers are preferred as the reinforcing material. The T1000 carbon fiber guide post has the highest strength, the M55J carbon fiber has the best rigidity, but the cost is higher, the performance improvement is not large compared with that of a composite material made of the M40J carbon fiber, the bonding force of the M40J fiber and resin is strong, and the composite material is simple to form.
In some embodiments, the present invention has no particular requirement on the polyimide resin selected, but in order to maintain better material properties at high temperatures, thermoset polyimide resins with glass transition temperatures above 450 ℃ are preferred. The thermal shock test under a long-time high-temperature environment cannot be met when the temperature is lower than 450 ℃, and the service life of the guide column is greatly reduced.
In some embodiments, in order to improve the corrosion resistance and the heat insulation performance of the guide post 13, a ceramic nano coating of 0.5mm is sprayed on the surface of the guide post 13. Experiments show that when the thickness of the coating is less than 0.5mm, the heat insulation performance is not enough, and the guide column 13 is easy to be bent due to thermal shock. When the thickness of the coating is more than 0.5mm, the straightness and the coaxiality of the guide post cannot be met, and the guide post is in fit with the hole. Preferably, a coating thickness of 0.5mm is optimal.
In some embodiments, in order to reduce the thermal expansion problem of the guide post 13 at high temperature, the fiber angle is (+45/0/-45/90)2s, and the test examination proves that the thermal expansion rate of the winding angle is the lowest.
The testing device also comprises two sliding blocks 16, the two sliding blocks 16 can be arranged at the upper end of the lower beam 1 in a relatively sliding manner, and the sliding blocks 16 are provided with lower pressure rollers 4 which are in running fit with the sliding blocks. The lower end of the middle part of the upper beam 6 is detachably provided with an upper pressing block 8, and the lower end of the upper pressing block 8 is provided with an upper pressing roller 5 which is in running fit with the upper pressing block. The lower part of the upper pressing block 8 is provided with a semicircular groove matched with the upper pressing roller 5. The upper part of the slide block 16 is provided with a semicircular groove matched with the lower pressure roller 4.
The small end of the upper pressing block 8 faces downwards, the upper pressing block is installed in a groove in the middle below the upper beam through a bolt, the deviation of the left position and the right position of the groove is +/-0.025 mm, centering performance is guaranteed, and the upper pressing roll 5 subjected to quenching treatment is fixed in a semicircular groove in the bottom of the upper pressing block 8 through the mounting frame 7 through a screw. The radius R of the upper press roll 5 is 3mm, is relatively small, is only suitable for the three-point bending test of small samples, and the upper press roll 5 with the radius R of 25mm or the radius R of 50mm can be replaced for large samples.
The small head of the sliding block 16 is upward and is arranged on the lower beam 1 through a first bolt 17, wherein the bolt is arranged in a blind ditch below the lower beam 1 in order to prevent the bolt from protruding out of the surface of the lower beam 1; the two sliding blocks 16 are respectively provided with a first bolt 17 which penetrates through the sliding groove to be locked on the lower beam 1, so that the first bolts 17 can drive the sliding blocks 16 to move left and right along the blind ditch to meet the requirements of different lengths of samples, and the test span can be freely adjusted between 10mm and 76 mm.
The lower pressing roller 4 is fixed in a semicircular groove at the upper end of the sliding block 16 through the bracket 3 by using a screw, a positioning plate 15 is arranged on the side surface of the sliding block 16, the positioning plate 15 is higher than the sliding block 16, a long hole 10 is formed in the positioning plate 15, and the positioning plate 15 and the sliding block 16 are in slidable connection through the second screw 2 passing through the long hole. The second screw 2 can slide along with the long hole 10, so that the second screw 2 is fixed after the sample 14 to be selected is aligned to the middle position, and the experimental results of the samples 14 in the same batch are not affected by the alignment inconsistency. And finally, fixing the conversion section 9 on the middle part of the upper beam 6 through bolts to prevent the guide column from being crushed during the test.
The radius R of the upper compression roller 5 is divided into three groups, namely 3mm, 25mm and 50mm, and the upper compression roller can be assembled according to actual needs during tests.
Experimental setup working principle (as shown in fig. 5): p is the bending force applied by the upper ram of the test apparatus and L is the span. Calculation of the flexural Strength σ by recording the value of P during the experiment with a force sensorf(i.e. the maximum stress of the outer surface corresponding to the maximum load):
in the formula:
σf-flexural strength in mpa;
Pmax-the sample is subjected to a maximum load in newtons;
l-span, in millimeters:
h-sample thickness in millimeters;
omega-sample width in millimeters.
In another embodiment, shown in fig. 3-4, a mechanical property testing apparatus comprises an experimental machine 30 and a mechanical property testing device as described in the previous embodiment; the testing machine 30 comprises a lower push pier 31, a temperature control box 33, a force sensor, a controller and a centering rotation prevention device 32. When the fatigue test is carried out, as the vibration frequency is high, the amplitude is large, and lateral force can be generated in the fatigue test process, the lower push pier 31 is caused to rotate, and after the centering rotation preventer 32 is arranged on the lower push pier 31, the torque generated by vibration can be counteracted, and the precision and the reliability of the fatigue test are greatly improved. Before the three-point bending experiment is carried out, a sample is stably placed on the testing device, the angle of the sample 14 is adjusted by the positioning plate 15, and the centering performance of the sample 14 and the testing device is guaranteed to be consistent. The entire experimental setup was then placed on the lower push pier 31 and the test setup was adjusted to ensure the base was level. And (3) mounting the centering rotation preventer 32 on the lower push pier 31, then adjusting the centering again to realize the centering of the testing device on the testing machine 30, and starting the experiment after the adjustment is finished.
A testing method of the mechanical property testing equipment in the embodiment comprises the following steps:
in a first step, the dimensions of the test specimen 14, the span between the two lower rolls 4 and the diameter of the upper roll 5 are selected according to the experimental requirements.
In the second step, the test sample 14 is placed in the mechanical property testing device, and the whole testing device is placed on the testing machine 30, and the testing device is adjusted to ensure the base to be horizontal.
Thirdly, the centering rotation preventer 32 is mounted on the lower push pier 31, and then the test sample 14 is centered and adjusted, so as to realize the centering of the test device on the testing machine 30.
To meet different span requirements of the samples, centering adjustment needs to be carried out on each batch of sample tests, as shown in fig. 6-7, the samples are centered and adjusted in the span direction firstly, according to the formula: a is 180/2-L/2-13 is B. Where L is the deviation of the values of the sample spans A and B. + -. 0.05mm, and then the first bolt 17 is fixed.
And secondly, centering and adjusting the sample in the thickness direction, wherein the formula is C-64/2-D/2, and D is the thickness of the sample. The deviation of the C value is + -0.05 mm, and then the second screw 2 is fixed.
And finally, centering and adjusting with the experimental machine. To ensure that the three point bend clamp is centered well on the MTS machine, a centering anti-rotation device 32 must be added as shown in fig. 3. Specifically, the centering rotation-preventing device 32 is installed on the lower push pier 31 of the MTS machine with the inner diameter facing downward, the sample is centered and adjusted to be three-point bent, and the lower beam 1 is installed in a groove (shown in fig. 4) formed in the centering rotation-preventing device 32, so that the centering of the three-point bending clamp on the testing machine is realized.
And fourthly, operating the controller to carry out mechanical property test experiment preparation work.
And fifthly, operating the temperature control box 33, and setting a temperature rise curve, a temperature rise rate and a heat preservation time according to requirements.
And sixthly, starting the experiment machine to start loading after the environmental temperature reaches the preset requirement, starting displacement control, and recording loading time, displacement and force values.
And seventhly, after the loading is finished, operating the temperature control box 33, taking out the testing device after the temperature is reduced to the room temperature, recording the damage condition of the sample and finishing data processing.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A mechanical property testing device comprises an upper beam and a lower beam; characterized in that, the testing device further comprises:
the two guide columns are arranged on the lower beam and are connected with the upper beam in a sliding fit manner; the guide column is made of a carbon fiber reinforced polyimide composite material;
the two sliding blocks can be arranged at the upper end of the lower beam in a relatively sliding manner, and a lower pressing roller in rotating fit with the sliding blocks is arranged on the sliding blocks;
the lower end of the middle part of the upper beam is detachably provided with an upper pressing block, and the lower end of the upper pressing block is provided with an upper pressing roller which is in running fit with the upper pressing block.
2. The mechanical property testing device of claim 1, wherein: the carbon fiber reinforced polyimide guide column is formed by winding, curing and molding carbon fiber monofilaments after the carbon fiber monofilaments are immersed in polyimide resin; the carbon fiber monofilaments are T700, T800, T1000, M40J or M55J carbon fiber monofilaments; the polyimide resin is a thermosetting polyimide resin with a glass transition temperature of more than 450 ℃.
3. The mechanical property testing device of claim 2, wherein: and the carbon fiber reinforced polyimide guide column is sprayed with a ceramic nano coating of 0.5 mm.
4. The mechanical property testing device of claim 1, wherein: the lower beam is provided with sliding grooves, and the two sliding blocks are provided with first bolts which penetrate through the sliding grooves to be locked on the lower beam.
5. The mechanical property testing device of claim 5, wherein: the upper part of the sliding block is provided with a semicircular groove matched with the lower compression roller, and the lower compression roller is rotatably fixed on the sliding block through a bracket; the side of slider is equipped with the locating plate, the locating plate is higher than the slider, it has the slot hole to open on the locating plate, the locating plate with the slider passes slot hole slidable connection through the second screw.
6. The mechanical property testing device of claim 1, wherein: the lower part of the upper pressing block is provided with a semicircular groove matched with the upper pressing roller, the upper pressing roller is rotatably fixed on the upper pressing block through a mounting frame, and the radius R of the upper pressing roller is 3mm, 25mm and 50mm respectively; the upper end of the upper beam is detachably provided with a conversion section.
7. The mechanical property testing device of claim 1, wherein: the upper end of the guide post is provided with a stop block for preventing the upper beam from sliding out of the guide post, and the stop block is a bolt.
8. A mechanical property testing apparatus comprising a testing machine and a mechanical property testing device according to any one of claims 1 to 7.
9. The mechanical property testing apparatus of claim 8, wherein: the experimental machine comprises a lower push pier, a temperature control box, a controller and a centering rotation prevention device.
10. A method for testing a mechanical property testing device according to claim 9, comprising the steps of:
s1: the sample size, the span between the two lower rolls and the diameter of the upper roll are selected according to experimental requirements.
S2: and placing the sample in the mechanical property testing device, placing the whole testing device on the testing machine, and adjusting the testing device to ensure the base to be horizontal.
S3: and (3) mounting the centering rotation preventer on the lower push pier, and then centering and adjusting the test sample to realize the centering of the test device in the testing machine.
S4: and operating the controller to carry out mechanical property test experiment preparation work.
S5: and operating the temperature control box, and setting a temperature rise curve, a temperature rise rate and a heat preservation time according to requirements.
S6: and when the environmental temperature reaches a preset requirement, starting the experiment machine to start loading, starting displacement control, and recording loading time, displacement and a force value.
S7: and after the loading is finished, operating the temperature control box, taking out the testing device after the temperature is reduced to the room temperature, recording the damage condition of the sample and finishing data processing.
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