CN112858054A - Device and method for testing rigidity fatigue of automobile parts with lateral force - Google Patents
Device and method for testing rigidity fatigue of automobile parts with lateral force Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 27
- 238000009661 fatigue test Methods 0.000 claims abstract description 21
- 238000006073 displacement reaction Methods 0.000 claims abstract description 17
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- 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
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
A test device for rigidity fatigue of automobile parts with lateral force comprises a loading device, a pressure rod, a pressure head connecting device, pressure heads and a sample piece fixing device, wherein the loading device is fixedly connected with the pressure rod, the pressure rod is fixedly connected with the geometric center of the pressure head connecting device, the number of the pressure heads is 2, the pressure heads are symmetrical about the geometric center of the pressure head connecting device, the pressure head connecting device is fixedly connected with the pressure head, a sample piece is arranged between the pressure head and the sample piece fixing device, the pressure head is in contact with the sample piece, and the sample piece is fixedly connected with the sample piece fixing device; a rigidity test method for automobile parts with lateral force comprises the steps of sample piece standing, sample piece installation, load application, load recording and the like, and a fatigue test comprises the steps of sample piece installation, test force or displacement loading, sample piece temperature regulation, test post-treatment, evaluation and the like.
Description
Technical Field
The invention relates to the field of automobile part testing, in particular to a device and a method for testing rigidity fatigue of an automobile part with a lateral force.
Background
At present, in the research and production of automobile parts at home and abroad, a plurality of parts need to be subjected to rigidity fatigue tests, a rigidity fatigue test method which is widely adopted adopts the rigidity fatigue test under vertical load, as shown in figure 1, and for the rigidity fatigue test of lateral loading and asymmetric parts as shown in figure 2-1 or figure 2-2, when a stress surface and a horizontal plane generate a certain angle, a certain lateral force can be generated for a pressure head, as shown in figure 3, the lateral force can be increased along with the increase of the angle. Due to the action of the lateral force, the acting force in the loading direction is changed, and the test precision cannot be ensured. Meanwhile, the existence of lateral force can cause the deformation of the pressure lever, so that the equipment is abraded and even damaged. Therefore, a device and a method for testing the rigidity fatigue of the automobile parts with lateral force are needed to solve the problems.
Disclosure of Invention
The invention aims to provide a device and a method for testing the rigidity fatigue of an automobile part with a lateral force, which aim to solve the problems in the prior art.
In order to achieve the purpose, the invention provides a device for testing the rigidity fatigue of automobile parts with lateral force, which comprises a loading device, a pressure rod connecting device, a pressure head and a sample piece fixing device, wherein the loading device is fixedly connected with the pressure rod, the pressure rod is fixedly connected with the geometric center of the pressure head connecting device, the number of the pressure heads is 2, the pressure heads are symmetrical about the geometric center of the pressure head connecting device, the pressure head connecting device is fixedly connected with the pressure head, a sample piece is arranged between the pressure head and the sample piece fixing device, the pressure head is in contact with the sample piece, and the sample piece is fixedly connected with the sample piece fixing device.
Further, loading attachment is motor drive's tension and compression testing machine, pressure head axle center direction is 45 contained angles with sample fixing device bottom, the pressure head cross-section is isosceles triangle, the sample passes through the bolt fastening on sample fixing device, and isosceles triangle pressure head symmetric design can keep equal to elastomer side direction component loading power, and the opposite direction eliminates the influence of side direction power.
Further, loading device is hydraulic pressure servo actuator, pressure head axle center direction is 180 contained angles with sample fixing device bottom, pressure head connecting device and pressure head body coupling, sample fixing device cross-section is the U type.
A method for testing the rigidity fatigue of an automobile part with a lateral force comprises the following steps:
s1: standing a sample piece: before test and measurement, standing the sample piece for 24 hours at room temperature of 18-28 ℃;
s2: installing a sample piece: installing a sample piece on a sample piece fixing device, wherein the load is 1000N-50000N;
s3: applying positive and negative direction loads: loading the sample piece for 3 times according to the loading speed required by the test working condition, wherein the loading force ranges from P1min to P1 max;
s4: recording the test load: recording a test load P2 min-P2 max, wherein the test load is 1000N-50000N;
s5: and (3) calculating a rigidity test result: rigidity MN/mm ═ Δ F/2 Δ L;
wherein, DeltaF is the applied load, and DeltaL is the displacement of the sample piece;
further, in step S2, the rigidity of the test fixture is at least 3-5 times of the rigidity of the sample.
Further, in the step S4, the test load is 1000N to 50000N.
Further, in the rigidity test method, in step S3, the loading device needs to apply a preload to the sample before applying the load in the positive and negative directions to the sample, where the preload is 20N.
Further, in the rigidity test method, in step S3, a recovery time of 30 seconds is set for the sample before and after the positive and negative direction loads are applied to the sample.
Further, the fatigue test method comprises the following steps:
a1: installing a sample piece: installing a sample piece on the sample piece fixing device;
a2: load test force or displacement: loading lateral or radial test force or displacement according to the test requirements of the sample piece, and recording the test loading times and the loading force or displacement value;
a3: regulating and controlling the temperature of the sample piece: measuring the temperature of a sample piece through infrared temperature measuring equipment, and adjusting the temperature of the sample piece by means of an axial flow variable frequency fan, wherein the temperature of the sample piece is less than or equal to 50 ℃;
a4: and (3) post-treatment of the test: after the test is finished, standing the sample piece for 24 hours in an environment of 18-24 ℃, and measuring the rigidity performance along the loading direction of the fatigue test;
a5: and (3) evaluating the state of the test piece: and observing the state of the sample piece, and finishing the test on the fatigue performance of the sample piece if the sample piece cracks and is damaged.
Furthermore, in the step A2, the test force is 1000-50000N, the loading times is 1000000, and the test frequency is 0.9-1.1 Hz.
Compared with the prior art, the invention has the beneficial effects that:
according to the rigidity (fatigue) test method and the test device for the automobile parts, provided by the invention, the elimination of the lateral force in the test process is realized through the synchronous test of the two groups of samples, so that the damage of the test machine caused by the action of the lateral force in the test process is avoided, and the test precision is improved. In addition, the invention also provides reference for other related problems in the same field, and has stronger applicability and wide application prospect.
Drawings
FIG. 1 is a schematic diagram of a prior art stiffness fatigue test under vertical loading;
FIG. 2-1 is a schematic view of a stiffness fatigue test under side loading;
FIG. 2-2 is a schematic diagram of a stiffness fatigue test of an asymmetric sample;
FIG. 3 is a schematic view of analysis of loading force of a lateral loading and a rigid fatigue test of an asymmetric component in a rigid fatigue test;
FIG. 4 is a loading force analysis diagram of a testing device for rigidity fatigue of automobile parts with lateral force;
FIG. 5 is a schematic view of an embodiment 1 of a device for testing the rigidity fatigue of an automobile part with a lateral force;
FIG. 6-1 is a schematic view of a stiffness fatigue test under side load;
FIG. 6-2 is a schematic view of an embodiment 2 of a device for testing the rigidity fatigue of an automobile part with a lateral force;
FIG. 7-1 is a schematic view of an initial state of example 3 of a test apparatus for rigidity fatigue of an automobile part with a lateral force;
FIG. 7-2 is a schematic view of the device for testing the rigidity fatigue of the automobile parts with lateral force after applying a loading force;
7-3 are schematic diagrams of an embodiment 3 of the testing device for rigidity fatigue of the automobile parts with lateral force;
FIG. 8 is a loading force waveform diagram of a method for testing the stiffness fatigue of an automobile part with a lateral force.
In the figure: 1. the device comprises a loading device, 2, a pressure rod, 3, a pressure head connecting device, 4, a pressure head, 5, a sample piece, 6, a sample piece fixing device, 7 and a bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1: a pair of same sample pieces are selected, one sample piece is installed on a base of a sample piece fixing device 6 according to test requirements, the other sample piece is installed at a symmetrical position, the upper ends of the two sample pieces are connected through a pressure head 4, and the sample piece fixing device 6 and the base can be integrated or detachably connected.
As shown in fig. 5, the device for testing the rigidity fatigue of the automobile part with the lateral force comprises a loading device 1, a pressure rod 2, a pressure head connecting device 3, a pressure head 4 and a sample piece fixing device 6, wherein the loading device 1 is fixedly connected with the pressure rod 2, the pressure rod 2 is fixedly connected with the geometric center of the pressure head connecting device 3, the pressure heads 4 are provided with 2 pressure heads and are symmetrical about the geometric center of the pressure head connecting device 3, the pressure head connecting device 3 is fixedly connected with the pressure head 4, a sample piece 5 is arranged between the pressure head 4 and the sample piece fixing device 6, the pressure head 4 is in contact with the sample piece 5, and the sample piece 5 is fixedly connected with the sample piece fixing device 6;
a method for testing the rigidity fatigue of an automobile part with a lateral force comprises the following steps:
s1: standing a sample piece: before test and measurement, the sample piece is kept stand for 24 hours at the room temperature of 18-28 ℃, and the performance of the automobile parts of the rubber body is most stable at the pretreatment temperature;
s2: installing a sample piece: installing the sample 2 on the sample fixing device 6, wherein the load is 1000N-50000N;
s3: applying positive and negative direction loads: loading the sample piece for 3 times according to the loading speed required by the test working condition, wherein the loading force ranges from P1min to P1 max;
s4: recording the test load: recording a test load P2 min-P2 max, wherein the test load is 1000N-50000N;
s5: and (3) calculating a rigidity test result: rigidity MN/mm ═ Δ F/2 Δ L.
In the step S2, the rigidity of the test fixture is at least 3-5 times of the rigidity of the sample piece 2, so that the fixture deformation can be avoided, and the detection result error can be avoided.
In step S4, the test load is 1000N to 50000N.
In the rigidity test method, in step S3, before applying the positive and negative direction loads to the sample 2, the loading device 1 needs to apply a preload to the sample, the preload is 20N, the loading idle stroke is eliminated, and the test accuracy is improved.
The rigidity test method, in step S3, a 30-second recovery time was set for the sample 2 before and after the application of the positive and negative direction loads to the sample 2, so that the hysteresis of the load and deformation of the elastic body could be eliminated.
As shown in fig. 4, the fatigue test method includes the steps of:
a1: installing a sample piece: installing the sample 2 on the sample fixing device 6;
a2: load test force or displacement: loading lateral or radial test force or displacement according to the test requirements of the sample piece, and recording the test loading times and the loading force or displacement value;
a3: regulating and controlling the temperature of the sample piece: measuring the temperature of the sample piece by infrared temperature measuring equipment, and adjusting the temperature of the sample piece 2 by means of an axial flow variable frequency fan, wherein the temperature of the sample piece is less than or equal to 50 ℃, and when the temperature is too high, the test sample piece is sticky when being an elastomer, so that the test result is influenced;
a4: and (3) post-treatment of the test: after the test is finished, the sample piece is kept stand for 24 hours at the temperature of 18-24 ℃ to stabilize the internal temperature of the rubber elastic body, eliminate the waxy change influence of the temperature on the rubber body and measure the rigidity performance along the loading direction of the fatigue test;
a5: and (3) evaluating the state of the test piece: and (4) observing the state of the sample piece 2, judging whether cracking and damage phenomena exist or not, and finishing the test on the fatigue performance of the sample piece, wherein the permanent deformation of the sample piece cannot exceed 7% of the initial length before the test.
In the step A2, the test force is 1000-50000N, the loading times are 1000000, and the test frequency is 0.9-1.1 Hz.
Example 2: a pair of same sample pieces are selected, one sample piece is installed on a base of a sample piece fixing device 6 according to test requirements, the other sample piece is installed at a symmetrical position, the upper ends of the two sample pieces are connected through a pressure head 4, and the sample piece fixing device 6 and the base can be integrated or detachably connected.
As shown in fig. 6-2, a test device for rigidity fatigue of automobile parts with a lateral force, comprises a loading device 1, a pressure rod 2, a pressure head connecting device 3, a pressure head 4 and a sample fixing device 6, wherein the loading device 1 is a motor-driven tension and compression testing machine, the loading device 1 is fixedly connected with the pressure rod 2, the pressure rod 2 is fixedly connected with the geometric center of the pressure head connecting device 3, the cross section of the pressure head 4 is isosceles triangle, the pressure head 4 is provided with 2 pressure heads and is symmetrical about the geometric center of the pressure head connecting device 3, the pressure head connecting device 3 is fixedly connected with the pressure head 4, the axial direction of the pressure head 4 forms an included angle of 45 degrees with the bottom of the sample fixing device 6, a sample 5 is arranged between the pressure head 4 and the sample fixing device 6, the pressure head 4 is in contact with the sample 5, and the sample 5 is fixed on the.
As shown in FIG. 6-1, the test was conducted as shown, which resulted in a large lateral force on the compression bar. In the figure 6-2, a cylindrical sample piece 5 is fixed on a sample piece fixing device 6 through a bolt 7 of a sample, an isosceles triangle pressure head 4 with a shape required by a test is connected to a pressure head connecting device 3 through a bolt, a metal block pressure head connecting device 3 is connected to a compression testing machine compression bar 2 of a tension and compression test, a testing machine loading device 1 applies load to the compression bar 2, and lateral forces generated by two groups of samples in the test are mutually offset.
A method for testing the rigidity fatigue of an automobile part with a lateral force comprises the following steps:
s1: standing a sample piece: before test and measurement, the sample piece is kept stand for 24 hours at the room temperature of 18-28 ℃, and the performance of the automobile parts of the rubber body is most stable at the pretreatment temperature;
s2: installing a sample piece: installing the sample 2 on the sample fixing device 6, wherein the load is 1000N-50000N;
s3: applying positive and negative direction loads: loading the sample piece for 3 times according to the loading speed required by the test working condition, wherein the loading force ranges from P1min to P1 max;
s4: recording the test load: recording a test load P2 min-P2 max, wherein the test load is 1000N-50000N;
s5: and (3) calculating a rigidity test result: rigidity MN/mm ═ Δ F/2 Δ L.
In the step S2, the rigidity of the test fixture is at least 3-5 times of the rigidity of the sample piece 2, so that the fixture deformation can be avoided, and the detection result error can be avoided.
In step S4, the test load is 1000N to 50000N.
In the rigidity test method, in step S3, before applying the positive and negative direction loads to the sample 2, the loading device 1 needs to apply a preload to the sample, the preload is 20N, the loading idle stroke is eliminated, and the test accuracy is improved.
The rigidity test method, in step S3, a 30-second recovery time was set for the sample 2 before and after the application of the positive and negative direction loads to the sample 2, so that the hysteresis of the load and deformation of the elastic body could be eliminated.
As shown in fig. 4, the fatigue test method includes the steps of:
a1: installing a sample piece: installing the sample 2 on the sample fixing device 6;
a2: load test force or displacement: loading lateral or radial test force or displacement according to the test requirements of the sample piece, and recording the test loading times and the loading force or displacement value;
a3: regulating and controlling the temperature of the sample piece: measuring the temperature of the sample piece by infrared temperature measuring equipment, and adjusting the temperature of the sample piece 2 by means of an axial flow variable frequency fan, wherein the temperature of the sample piece is less than or equal to 50 ℃, and when the temperature is too high, the test sample piece is sticky when being an elastomer, so that the test result is influenced;
a4: and (3) post-treatment of the test: after the test is finished, the sample piece is kept stand for 24 hours at the temperature of 18-24 ℃ to stabilize the internal temperature of the rubber elastic body, eliminate the waxy change influence of the temperature on the rubber body and measure the rigidity performance along the loading direction of the fatigue test;
a5: and (3) evaluating the state of the test piece: and (4) observing the state of the sample piece 2, judging whether cracking and damage phenomena exist or not, and finishing the test on the fatigue performance of the sample piece, wherein the permanent deformation of the sample piece cannot exceed 7% of the initial length before the test.
In the step A2, the test force is 1000-50000N, the loading times are 1000000, and the test frequency is 0.9-1.1 Hz.
Example 3: a pair of same sample pieces are selected, one sample piece is installed on a base of a sample piece fixing device 6 according to test requirements, the other sample piece is installed at a symmetrical position, the upper ends of the two sample pieces are connected through a pressure head 4, and the sample piece fixing device 6 and the base can be integrated or detachably connected.
As shown in fig. 7-3, a test device for rigidity fatigue of automobile parts with a lateral force, comprises a loading device 1, a pressure rod 2, a pressure head connecting device 3, a pressure head 4 and a sample fixing device 6, wherein the loading device 1 is a hydraulic servo actuator, the loading device 1 is fixedly connected with the pressure rod 2, the pressure rod 2 is fixedly connected with the geometric center of the pressure head connecting device 3, the pressure head 4 is provided with 2 pressure heads and is symmetrical about the geometric center of the pressure head connecting device 3, the pressure head connecting device 3 is integrally connected with the pressure head 4, the axial direction of the pressure head 4 forms an included angle of 180 degrees with the bottom of the sample fixing device 6, the cross section of the sample fixing device 6 is U-shaped, a sample 5 is arranged between the pressure head 4 and the sample fixing device 6, the pressure head 4 is in contact with the sample 5, and the sample 5 is fixedly connected with the.
When the test is started, as shown in fig. 7-1, the compression bar 2 and the sample piece 5 are in a vertical position without lateral force; when the sample is deformed due to the increase in pressure, as shown in fig. 7-2, the sample 5 is not perpendicular to the plunger 2, and the sample 5 will generate a lateral force on the plunger 2. In fig. 7-3, the sample 5 is fixed to a U-shaped sample holder 6 welded with metal, the indenter and the connecting device required for the test are designed as an integral indenter 4, and the integral indenter 4 is connected to a plunger 2 whose loading device is a hydraulic servo actuator. The lateral forces generated by the two groups of sample pieces are mutually offset in the test process.
A method for testing the rigidity fatigue of an automobile part with a lateral force comprises the following steps:
s1: standing a sample piece: before test and measurement, the sample piece is kept stand for 24 hours at the room temperature of 18-28 ℃, and the performance of the automobile parts of the rubber body is most stable at the pretreatment temperature;
s2: installing a sample piece: installing the sample 2 on the sample fixing device 6, wherein the load is 1000N-50000N;
s3: applying positive and negative direction loads: as shown in fig. 8, the sample is loaded for 3 times according to the loading speed required by the test condition, the loading force ranges from P1min to P1max, and the test force borne by the sample ranges from P2min to P2 max;
s4: recording the test load: recording a test load P2 min-P2 max, wherein the test load is 1000N-50000N;
s5: and (3) calculating a rigidity test result: rigidity MN/mm ═ Δ F/2 Δ L.
In the step S2, the rigidity of the test fixture is at least 3-5 times of the rigidity of the sample piece 2, so that the fixture deformation can be avoided, and the detection result error can be avoided.
In step S4, the test load is 1000N to 50000N.
In the rigidity test method, in step S3, before applying the positive and negative direction loads to the sample 2, the loading device 1 needs to apply a preload to the sample, the preload is 20N, the loading idle stroke is eliminated, and the test accuracy is improved.
The rigidity test method, in step S3, a 30-second recovery time was set for the sample 2 before and after the application of the positive and negative direction loads to the sample 2, so that the hysteresis of the load and deformation of the elastic body could be eliminated.
As shown in fig. 4, the fatigue test method includes the steps of:
a1: installing a sample piece: installing the sample 2 on the sample fixing device 6;
a2: load test force or displacement: loading lateral or radial test force or displacement according to the test requirements of the sample piece, and recording the test loading times and the loading force or displacement value;
a3: regulating and controlling the temperature of the sample piece: measuring the temperature of the sample piece by infrared temperature measuring equipment, and adjusting the temperature of the sample piece 2 by means of an axial flow variable frequency fan, wherein the temperature of the sample piece is less than or equal to 50 ℃, and when the temperature is too high, the test sample piece is sticky when being an elastomer, so that the test result is influenced;
a4: and (3) post-treatment of the test: after the test is finished, the sample piece is kept stand for 24 hours at the temperature of 18-24 ℃ to stabilize the internal temperature of the rubber elastic body, eliminate the waxy change influence of the temperature on the rubber body and measure the rigidity performance along the loading direction of the fatigue test;
a5: and (3) evaluating the state of the test piece: and (4) observing the state of the sample piece 2, judging whether cracking and damage phenomena exist or not, and finishing the test on the fatigue performance of the sample piece, wherein the permanent deformation of the sample piece cannot exceed 7% of the initial length before the test.
In the step A2, the test force is 1000-50000N, the loading times are 1000000, and the test frequency is 0.9-1.1 Hz.
Such a sample would generate a large lateral force if tested using a conventional (e.g., fig. 2) test method, which performs a test-accompanying test (e.g., fig. 4) by selecting a set of identical samples to mount in a mirror-like fashion.
In the test process, the lateral forces of the two groups of test samples are equal in magnitude and opposite in direction, and are mutually offset, so that the influence of the lateral forces on the test is eliminated.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a test device of automobile parts rigidity fatigue with yawing force, its characterized in that, including loading device (1), depression bar (2), pressure head connecting device (3), pressure head (4), appearance fixing device (6), loading device (1) and depression bar (2) fixed connection, depression bar (2) and pressure head connecting device (3) geometric centre fixed connection, pressure head (4) are provided with 2 and about pressure head connecting device (3) geometric centre symmetry, pressure head connecting device (3) and pressure head (4) fixed connection, be provided with appearance (5) between pressure head (4) and appearance fixing device (6), pressure head (4) touch with appearance (5) and connect, appearance (5) and appearance fixing device (6) fixed connection.
2. The device for testing the rigidity fatigue of the automobile part with the lateral force according to claim 1, wherein the loading device (1) is a motor-driven tension and compression testing machine, the axial direction of the pressure head (4) forms an included angle of 45 degrees with the bottom surface of the sample fixing device (6), the section of the pressure head (4) is in an isosceles triangle shape, and the sample (5) is fixed on the sample fixing device (6) through a bolt (7).
3. The device for testing the rigidity fatigue of the automobile part with the lateral force according to claim 1, wherein the loading device (1) is a hydraulic servo actuator, the axial direction of the pressure head (4) forms an included angle of 180 degrees with the bottom surface of the sample fixing device (6), the pressure head connecting device (3) is integrally connected with the pressure head (4), and the cross section of the sample fixing device (6) is U-shaped.
4. A method for testing the rigidity fatigue of an automobile part with a lateral force is characterized by comprising the following steps:
s1: standing a sample piece: before test measurement, standing the sample piece for 24 hours at the room temperature of 18-28 ℃;
s2: installing a sample piece: installing the sample piece (2) on a sample piece fixing device (6) under the load of 1000N-50000N;
s3: applying positive and negative direction loads: loading the sample piece for 3 times, wherein the loading force ranges from P1min to P1 max;
s4: recording the test load: recording a test load P2 min-P2 max, wherein the test load is 1000N-50000N;
s5: and (3) calculating a rigidity test result: rigidity M (N/mm) =. DELTA.F/2. DELTA.L.
5. The method for testing the rigidity fatigue of the automobile part with the lateral force as recited in claim 4, wherein in the step S2, the rigidity of the test fixture is at least 3-5 times of the rigidity of the sample.
6. The method for testing the rigidity fatigue of the automobile part with the lateral force as recited in claim 4, wherein in the step S4, the test load is 1000N-50000N.
7. The method for testing the rigidity fatigue of the automobile part with the lateral force according to claim 4, wherein in the rigidity testing method, step S3, before applying the positive and negative directional loads to the sample, the loading device (1) applies a preload to the sample, and the preload is 20N.
8. The method of claim 4, wherein the step S3 is a step of setting a recovery time for the sample to 30 seconds before and after applying the positive and negative directional loads to the sample.
9. The method for testing the rigidity fatigue of the automobile part with the lateral force according to claim 4, wherein the fatigue testing method comprises the following steps:
a1: installing a sample piece: installing the sample piece (2) on a sample piece fixing device (6);
a2: load test force or displacement: loading lateral or radial test force or displacement according to the test requirements of the sample piece, and recording the test loading times and the loading force or displacement value;
a3: regulating and controlling the temperature of the sample piece: measuring the temperature of a sample piece through infrared temperature measuring equipment, and adjusting the temperature of the sample piece by means of a Saturday variable frequency fan, wherein the temperature of the sample piece is less than or equal to 50 ℃;
a4: and (3) post-treatment of the test: after the test is finished, standing the sample piece for 24 hours at the temperature of 18-24 ℃, and measuring the rigidity performance along the loading direction of the fatigue test;
a5: and (3) evaluating the state of the test piece: and observing the state of the sample piece, and finishing the test on the fatigue performance of the sample piece if the sample piece cracks and is damaged.
10. The method for testing the rigidity fatigue of the automobile part with the lateral force as recited in claim 9, wherein in the step A2, the test force is 1000-50000N, the loading times are 1000000, and the test frequency is 0.9-1.1 Hz.
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