Method and device for testing high-speed tensile property of soft material and medium

Abstract

The invention discloses a method and a device for testing high-speed tensile property of a soft material and a medium, the method comprises the following steps: mounting a target soft material spline in a double-clamping-opening upper clamp of a high-speed testing machine, and setting a clamping distance to be not less than a preset distance; wherein a rigid material sample strip is fixed in the double-clamping-opening upper clamp; and performing high-speed tensile property test on the target soft material sample strip and the rigid material sample strip through a high-speed testing machine, and generating a stress-strain curve of the target soft material sample strip according to data obtained by the test. According to the method and device for testing the high-speed tensile property of the soft material and the medium, by controlling the center line of a rigid material spline to coincide with the center line of a high-speed testing machine, it can be ensured that mechanical conditions in the testing process are more consistent and controllable, testing deviation caused by improper positions of testing equipment or the spline can be eliminated, and the testing accuracy is improved. The problem that the high-speed tensile property test result of the material is not accurate due to the dead weight of equipment can be solved.

Description

Technical Field

[0001] The present invention relates to the field of image digital technology testing, and particularly to a testing method, device, and medium for the high-speed tensile performance of soft materials. Background Art

[0002] High-speed tensile performance testing is of utmost importance in engineering analysis. High-speed testing machines use a hydraulic servo system to control the strain rate or speed. During actual testing, since the external moving sleeve and the piston need to maintain an acceleration distance, the piston is in a suspended state at this time, and the piston and the connecting fixture directly apply their own weights to the specimen. The self-weight of the fixture has a greater impact on specimens of soft materials such as films and rubbers, easily leading to excessive initial prestress and affecting the testing accuracy. Currently, flat-type structure devices and vertical devices are often used to eliminate the influence of the fixture's self-weight. The flat-type structure device balances the self-weight of the fixture in the horizontal direction by horizontally placing the specimen and the fixture, thereby reducing the vertical offset or vibration caused by the self-weight. The remarkable feature of the vertical device is its vertical layout, that is, the main components of the device (such as the fixture, testing mechanism, etc.) are all vertically installed.

[0003] Although the flat-type structure device can theoretically eliminate the influence of the fixture's self-weight, such devices are relatively few and occupy a large area, which limits the wide application of the flat-type structure device. In contrast, due to its advantages such as a compact structure and a small footprint, the vertical device has been more widely used and accepted. However, it is difficult for the vertical device to effectively eliminate the self-weight of the lower fixture and the connecting piston rod, resulting in inaccurate testing results for the high-speed tensile performance of the material specimen. Summary of the Invention

[0004] The present invention provides a testing method, device, and medium for the high-speed tensile performance of soft materials to solve the problem of inaccurate testing results for the high-speed tensile performance of materials caused by the self-weight of the device.

[0005] To achieve the above object, the present invention provides a testing method for the high-speed tensile performance of soft materials, including:

[0006] Install a target soft material specimen to be tested in the double-jaw upper fixture of a high-speed testing machine, and set the clamping distance to be not less than a preset distance; wherein, a rigid material specimen is fixed in the double-jaw upper fixture, and the center line of the rigid material specimen coincides with the center line of the high-speed testing machine;

[0007] Perform high-speed tensile performance testing on the target soft material specimen and the rigid material specimen through the high-speed testing machine, and generate a stress-strain curve of the target soft material specimen according to the data obtained from the testing.

[0008] By setting the clamping distance to be not less than a preset distance, the present invention can ensure that there is sufficient space for deformation of the target soft material spline during the stretching process, avoiding stress concentration or limited deformation caused by over-tight clamping, thereby affecting the accuracy of the test results. By controlling the center line of the rigid material spline to coincide with the center line of the high-speed testing machine, this design enables the rigid material spline to provide a stable support and reference during the high-speed tensile performance test; due to the high strength and stiffness of the rigid material spline, it can better withstand and disperse the self-weight of the fixture and the connecting piston rod and other possible external interferences, making the force received by the target soft material spline during the test more uniform and consistent, reducing the potential interference of the fixture self-weight on the high-speed tensile performance test results. This method ensures that the test data is more pure, thus being able to more accurately reflect the mechanical properties of the target soft material spline.

[0009] Compared with the prior art, by controlling the center line of the rigid material spline to coincide with the center line of the high-speed testing machine, the present invention can ensure that the mechanical conditions during the test are more consistent and controllable, which helps to eliminate the test deviation caused by improper test equipment or spline position. Therefore, it can solve the problem of inaccurate high-speed tensile performance test results of materials caused by the self-weight of the equipment.

[0010] As a preferred solution, install the target soft material spline to be tested in the upper fixture of the double jaws of the high-speed testing machine, and set the clamping distance to be not less than a preset distance, specifically:

[0011] Pre-treat the target soft material spline and the rigid material spline;

[0012] Install the target soft material spline on the front side of the upper fixture of the double jaws of the high-speed testing machine, and make the lower fixture of the double jaws of the high-speed testing machine clamp the lower end of the target soft material spline;

[0013] Set the clamping distance at both ends of the target soft material spline to be not less than a preset distance; wherein, the preset distance is calculated according to the preset standard clamping distance and the displacement limit of the rigid material spline.

[0014] In this preferred solution, an appropriate clamping distance can ensure that the material spline is evenly stressed during the test, avoiding equipment damage caused by local stress concentration; by setting the clamping distance at both ends of the target soft material spline to be not less than a preset distance, the influence of the rigid material spline on the target soft material spline during the stretching process can be avoided.

[0015] As a preferred solution, pre-treat the target soft material spline and the rigid material spline, specifically:

[0016] Process the target soft material spline and the rigid material spline into the same preset standard size;

[0017] Perform speckle preparation on the target soft material spline to form uniformly distributed speckle points or paste marked points on the surface of the target soft material spline.

[0018] In this preferred solution, processing the two material splines into the same preset standard size can ensure that they have the same stress area and geometric shape during the test, thereby eliminating test errors caused by size differences. Speckle preparation or pasting marked points can enable more accurate tracking and calculation of the deformation of the material spline in subsequent image analysis or displacement measurement, improving the accuracy of test data.

[0019] As a preferred solution, the preset distance is calculated based on a preset standard clamping distance and the displacement limit of the rigid material spline, specifically:

[0020] Conduct a tensile property test on the rigid material spline to obtain the maximum force value and the displacement limit of the rigid material spline; wherein, the maximum force value is greater than the self-weight of the double-jaw fixture and the connecting piston rod in the high-speed testing machine, the double-jaw fixture includes the upper double-jaw fixture and the lower double-jaw fixture, and the displacement limit is less than a preset minimum value;

[0021] Calculate the preset distance based on the standard clamping distance and the displacement limit of the rigid material spline.

[0022] In this preferred solution, through the tensile property test, the maximum force value and the displacement limit of the rigid material spline can be understood. Calculating the preset distance based on the displacement limit and the standard clamping distance of the rigid material spline can ensure that during the test, the material spline can be fully deformed without affecting the test results due to over-tight or over-loose clamping.

[0023] As a preferred solution, a rigid material spline is fixed in the upper double-jaw fixture, and the center line of the rigid material spline coincides with the center line of the high-speed testing machine, specifically:

[0024] Fix the rigid material spline at the rear side of the upper double-jaw fixture, and control the lower double-jaw fixture of the high-speed testing machine to clamp the lower end of the rigid material spline;

[0025] Set the clamping distance at both ends of the rigid material spline to be not less than the preset standard clamping distance, and control the center line of the rigid material spline to coincide with the center line of the high-speed testing machine.

[0026] In this preferred solution, by controlling the center line of the rigid material spline to coincide with the center line of the high-speed testing machine, the self-weights of the fixture and the connecting piston rod are entirely borne by the rigid material, thereby achieving the purpose of offsetting the self-weights of the fixture and the piston connecting rod. This method eliminates the potential interference of the self-weights of these components on the test results of the high-speed tensile performance of the target soft material spline, ensuring that the test data is more pure, and thus can more accurately reflect the mechanical properties of the target soft material spline.

[0027] As a preferred solution, the high-speed tensile performance of the target soft material spline and the rigid material spline is tested by the high-speed testing machine, and the stress-strain curve of the target soft material spline is generated according to the data obtained from the test. Specifically:

[0028] Adjust the parameters of the high-speed testing machine and the camera;

[0029] The high-speed tensile performance of the target soft material spline and the rigid material spline is tested by the high-speed testing machine to obtain the stress value data of the testing machine and the camera image data;

[0030] The stress calculation and strain calculation are respectively carried out on the stress value data of the testing machine and the camera image data to obtain the engineering stress data and the engineering strain data;

[0031] The engineering stress data and the engineering strain data are combined, and the stress-strain curve of the target soft material spline is drawn according to the combined data.

[0032] In this preferred solution, by adjusting the parameters of the high-speed testing machine and the camera, it can be ensured that their performance and accuracy reach the best state during the test, thereby minimizing errors and uncertainties. By combining the engineering stress data and the engineering strain data and drawing the stress-strain curve, the process of processing and analyzing the test data can be simplified, and the test efficiency can be improved.

[0033] As a preferred solution, the stress calculation and strain calculation are respectively carried out on the stress value data of the testing machine and the camera image data to obtain the engineering stress data and the engineering strain data. Specifically:

[0034] Extract the data in the preset time period from the stress value data of the testing machine to obtain the stress value data;

[0035] According to the stress value data and the cross-sectional area of the target soft material spline, the engineering stress data is calculated;

[0036] Calibrate the camera image data, and establish a virtual extensometer on the calibrated image to obtain the virtual extensometer measurement specimen;

[0037] The engineering strain data is calculated based on the length change of the specimen during deformation measured by the virtual extensometer and the original length of the target soft material spline.

[0038] In this preferred solution, by extracting the stress value data within a preset time period, unstable data at the initial stage of the test can be excluded, improving the accuracy and representativeness of the data. Using a virtual extensometer to process the camera image data can avoid errors that may occur due to the contact between the traditional physical extensometer and the test piece, thereby improving the accuracy of strain measurement.

[0039] As a preferred solution, the high-speed testing machine is composed of a connecting piston rod, a force value sensor, and a double-jaw fixture including a double-jaw lower fixture and a double-jaw upper fixture;

[0040] Among them, when the high-speed testing machine grips the rigid material spline, it is controlled that the self-weights of the double-jaw fixture and the connecting piston rod are all borne.

[0041] In this preferred solution, when the self-weights of the fixture and the connecting piston rod are borne by the rigid material spline, the potential influence of the self-weights of these components on the test results can be eliminated. This can ensure that the test data is more accurate and can more truly reflect the mechanical properties of the material.

[0042] As a preferred solution, the installation positions of the target soft material spline and the rigid material spline are determined according to the orientation of the camera, specifically:

[0043] If the camera is in front of the double-jaw upper fixture, the target soft material spline is installed on the front side of the double-jaw upper fixture, and the rigid material spline is fixed on the rear side of the double-jaw upper fixture;

[0044] If the camera is behind the double-jaw upper fixture, the target soft material spline is installed on the rear side of the double-jaw upper fixture, and the rigid material spline is fixed on the front side of the double-jaw upper fixture.

[0045] This preferred solution adjusts the positions of the splines according to the orientation of the camera, which can minimize the influence of light, shadow or perspective problems on the shooting quality, thereby ensuring that high-definition and accurate image records of the target soft material spline can be obtained during the shooting process.

[0046] This application also provides a testing device for the high-speed tensile performance of soft materials, including an installation module and a testing module;

[0047] Among them, the installation module is used to install the target soft material spline to be measured in the upper fixture of the double jaws of the high-speed testing machine, and set the clamping distance to be not less than the preset distance; among them, a rigid material spline is fixed in the upper fixture of the double jaws, and the center line of the rigid material spline coincides with the center line of the high-speed testing machine;

[0048] The testing module is used to perform high-speed tensile property tests on the target soft material spline and the rigid material spline through the high-speed testing machine, and generate the stress-strain curve of the target soft material spline according to the test data obtained.

[0049] As a preferred solution, the installation module includes a processing unit, a clamping unit, and a setting unit;

[0050] Among them, the processing unit is used to preprocess the target soft material spline and the rigid material spline;

[0051] The clamping unit is used to install the target soft material spline on the front side of the upper fixture of the double jaws of the high-speed testing machine, and make the lower fixture of the double jaws of the high-speed testing machine clamp the lower end of the target soft material spline;

[0052] The setting unit is used to set the clamping distance between the two ends of the target soft material spline to be not less than the preset distance; among them, the preset distance is calculated according to the preset standard clamping distance and the displacement limit of the rigid material spline.

[0053] As a preferred solution, the processing unit includes a dimension sub-unit and a speckle sub-unit;

[0054] Among them, the dimension sub-unit is used to process the target soft material spline and the rigid material spline into the same preset standard dimensions;

[0055] The speckle sub-unit is used to make speckles on the target soft material spline, so that uniformly distributed speckle points or paste marking points are formed on the surface of the target soft material spline.

[0056] As a preferred solution, the setting unit includes a stretching sub-unit and a calculating sub-unit;

[0057] Among them, the stretching sub-unit is used to perform tensile property tests on the rigid material spline to obtain the maximum force value and the displacement limit of the rigid material spline; among them, the maximum force value is greater than the self-weight of the double-jaw fixture and the connecting piston rod in the high-speed testing machine, the double-jaw fixture includes the upper fixture of the double jaws and the lower fixture of the double jaws, and the displacement limit is less than the preset minimum value;

[0058] The calculation subunit is configured to calculate the preset distance according to the standard clamping distance and the displacement limit of the rigid material spline.

[0059] As a preferred solution, the installation module includes a fixing unit and a spacing unit;

[0060] Wherein, the fixing unit is configured to fix the rigid material spline at the rear side of the upper fixture of the double clamping jaws, and control the lower fixture of the double clamping jaws of the high-speed testing machine to clamp the lower end of the rigid material spline;

[0061] The spacing unit is configured to set the clamping distance between the two ends of the rigid material spline to be not less than a preset standard clamping distance, and control the center line of the rigid material spline to coincide with the center line of the high-speed testing machine.

[0062] As a preferred solution, the testing module includes an adjustment unit, a testing unit, a data unit and a curve unit;

[0063] Wherein, the adjustment unit is configured to adjust the parameters of the high-speed testing machine and the camera;

[0064] The testing unit is configured to perform high-speed tensile property tests on the target soft material spline and the rigid material spline through the high-speed testing machine to obtain testing machine stress value data and camera image data;

[0065] The data unit is configured to perform stress calculation and strain calculation on the testing machine stress value data and the camera image data respectively to obtain engineering stress data and engineering strain data;

[0066] The curve unit is configured to merge the engineering stress data and the engineering strain data, and draw a stress-strain curve of the target soft material spline according to the merged data.

[0067] As a preferred solution, the data unit includes an extraction subunit, a stress subunit, a calibration subunit and a strain subunit;

[0068] Wherein, the extraction subunit is configured to extract the data within a preset time period from the testing machine stress value data to obtain stress value data;

[0069] The stress subunit is configured to calculate the engineering stress data according to the stress value data and the cross-sectional area of the target soft material spline;

[0070] The calibration subunit is configured to calibrate the camera image data, and establish a virtual extensometer on the calibrated image to obtain a virtual extensometer measurement specimen;

[0071] The strain sub-unit is configured to calculate the engineering strain data based on the length change of the specimen during deformation measured by the virtual extensometer and the original length of the target soft material spline.

[0072] As a preferred solution, the high-speed testing machine is composed of a connecting piston rod, a force sensor, and a double-jaw fixture including a double-jaw lower fixture and a double-jaw upper fixture.

[0073] Wherein, when the high-speed testing machine grips the rigid material spline, it is controlled that the self-weights of the double-jaw fixture and the connecting piston rod are all borne.

[0074] As a preferred solution, the installation positions of the target soft material spline and the rigid material spline are determined according to the orientation of the camera. Specifically:

[0075] If the camera is in front of the double-jaw upper fixture, the target soft material spline is installed on the front side of the double-jaw upper fixture, and the rigid material spline is fixed on the rear side of the double-jaw upper fixture.

[0076] If the camera is behind the double-jaw upper fixture, the target soft material spline is installed on the rear side of the double-jaw upper fixture, and the rigid material spline is fixed on the front side of the double-jaw upper fixture.

[0077] The present application also provides a storage medium, on which a computer program is stored. The computer program is called and executed by a computer to implement the above-mentioned method for testing the high-speed tensile performance of a soft material. Description of the Drawings

[0078] Figure 1 is a schematic flowchart of a method for testing the high-speed tensile performance of a soft material provided by an embodiment of the present application;

[0079] Figure 2 is a force-displacement curve graph of the double-jaw fixture pre-independently testing the auxiliary rigid material provided by an embodiment of the present application;

[0080] Figure 3 is a schematic diagram of the clamping distance control when the double-jaw fixture clamps the sample provided by an embodiment of the present application;

[0081] Figure 4 is a force-test time curve graph of the double-jaw fixture clamping the auxiliary rigid material and the soft material to be tested provided by an embodiment of the present application;

[0082] Figure 5 is a schematic diagram of the high-speed tensile equipment configured with a double-jaw fixture device provided by an embodiment of the present application;

[0083] Figure 6 It is a schematic installation structure diagram of the double-jaw fixture device provided by an embodiment of the present application;

[0084] Figure 7 It is a front view of the piston structure of the double-jaw fixture device provided by an embodiment of the present application;

[0085] Figure 8 It is an engineering strain - test time curve graph of the soft material to be measured for CCD camera DIC analysis provided by an embodiment of the present application;

[0086] Figure 9 It is an engineering stress - engineering strain curve graph of the soft material to be measured provided by an embodiment of the present application;

[0087] Figure 10 It is a test flow chart provided by an embodiment of the present application;

[0088] Figure 11 It is a schematic structure diagram of a test device for the high-speed tensile performance of a soft material provided by an embodiment of the present application. Specific embodiments

[0089] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0090] In the description of the present application, unless otherwise specified, the meaning of "several" is two or more.

[0091] A test method for the high-speed tensile performance of a soft material provided by an embodiment of the present application is mainly applied to the situation where it is necessary to eliminate the self-weight of the lower fixture and the connecting piston rod of the vertical equipment to improve the accuracy of the test results of the high-speed tensile performance of the material.

[0092] Embodiment 1:

[0093] Please refer to Figure 1 , an embodiment of the present application provides a test method for the high-speed tensile performance of a soft material, including S1 to S2, and the specific implementation steps are as follows:

[0094] S1. Install the target soft material sample strip to be measured in the double-jaw upper fixture of the high-speed testing machine, and set the clamping distance not less than the preset distance; wherein, a rigid material sample strip is fixed in the double-jaw upper fixture, and the center line of the rigid material sample strip coincides with the center line of the high-speed testing machine.

[0095] Step S1 of the embodiment of the present application includes S1.1 to S1.3, specifically:

[0096] S1.1. Obtain a target soft material spline and a rigid material spline; among them, the target soft material spline is a soft material and is the test object; the rigid material spline can be a weld mark spline formed during the injection molding process or a spline with a prefabricated notch, and the rigid material spline plays an auxiliary role and is mainly used for load bearing and support. It should be noted that the role of the rigid material spline is to provide a stable and strong enough support so as to accurately measure the performance of the target soft material spline during the test; however, if the displacement limit of the rigid material spline is too large, it may interfere with the test results of the target soft material spline; therefore, measures need to be taken to reduce its displacement limit. The role of the weld mark spline or the prefabricated notch is to reduce the displacement limit by reducing the strength of some areas while ensuring the strength of the rigid material spline, so as to more accurately measure the performance of the target soft material spline; if the conventional spline can meet the corresponding displacement limit, strength requirements and test accuracy standards, the conventional spline can also be used for load bearing and support.

[0097] Process the target soft material spline and the rigid material spline into dumbbell-shaped splines of the same preset standard size by injection molding or machining; place the target soft material spline and the rigid material spline under specific temperature and humidity conditions for a period of time to ensure that the splines reach a stable physical state and eliminate performance changes caused by environmental factors.

[0098] According to the test target, conduct a tensile property test on the rigid material spline to obtain the maximum force value F m and the displacement limit D m ; among them, the maximum force value F m is greater than the self-weight of the double-jaw fixture and the connecting piston rod in the high-speed testing machine, and the double-jaw fixture includes an upper double-jaw fixture and a lower double-jaw fixture, and the displacement limit D m is less than the preset minimum value; when the test target is to obtain roughly, a quasi-static high-speed tensile property test can be carried out, and when the test target is to obtain accurately, a high-speed tensile property test under the same conditions can be carried out;

[0099] According to the preset standard clamping distance L0 and the displacement limit D of the rigid material spline m calculate to obtain the preset distance L; where, L = L0 + 2D m .

[0100] For the application of the embodiment of the present application, please refer to Figure 2 , Figure 2It is the force-displacement curve diagram of the double-clamp fixture provided by the embodiment of the present application for pre-individually testing an auxiliary rigid material, which shows the relationship between the displacement (or deformation) and the external force during the force application process of the rigid material spline when performing a tensile property test.

[0101] In step S1.1 of this embodiment, the two material splines are processed into the same preset standard size, which can ensure that they have the same force-bearing area and geometric shape during the test, thereby eliminating the test error caused by size differences.

[0102] Through the tensile property test, the maximum force value and displacement limit of the rigid material spline can be understood. Calculating the preset distance based on the displacement limit of the rigid material spline and the standard clamping distance can ensure that during the test, the material spline can be fully deformed without affecting the test results due to over-tight or over-loose clamping.

[0103] In S1.2, the rigid material spline is fixed at the rear side of the upper fixture of the double clamp, and the lower fixture of the double clamp of the high-speed testing machine is controlled to clamp the lower end of the rigid material spline.

[0104] The clamping distance at both ends of the rigid material spline is set to be not less than the standard clamping distance L0, and the center line of the rigid material spline is controlled to coincide with the center line of the high-speed testing machine. At this time, the self-weights of the lower clamp of the double clamp and the connecting piston rod are all applied to the auxiliary rigid material spline, thereby realizing the full bearing of the self-weights of the double-clamp fixture and the connecting piston rod.

[0105] In step S1.2 of this embodiment, by controlling the center line of the rigid material spline to coincide with the center line of the high-speed testing machine, the self-weights of the fixture and the connecting piston rod are all borne by the rigid material, so as to achieve the purpose of offsetting the self-weights of the fixture and the piston connecting rod. This method eliminates the potential interference of the self-weights of these components on the test results of the high-speed tensile properties of the target soft material spline, ensures that the test data is purer, and thus can more accurately reflect the mechanical properties of the target soft material spline.

[0106] In S1.3, the target soft material spline is sprayed with speckles or marked, so that evenly distributed speckle points or pasted marking points are formed on the surface of the target soft material spline for the CCD camera and the image analysis system using digital image technology to identify and obtain image information; among them, the "CCD camera", the full name is Charge-Coupled Device camera, that is, a charge-coupled device camera, which is a camera using a CCD (charge-coupled device) as an image sensor.

[0107] Install the processed target soft material spline on the front side of the upper fixture of the double-jaw on the high-speed testing machine, and make the lower fixture of the double-jaw of the high-speed testing machine clamp the lower end of the target soft material spline; wherein, the installation positions of the target soft material spline and the rigid material spline are determined according to the orientation of the CCD camera. Specifically: if the CCD camera is in front of the upper fixture of the double-jaw, install the target soft material spline on the front side of the upper fixture of the double-jaw, and fix the rigid material spline on the rear side of the upper fixture of the double-jaw; if the CCD camera is behind the upper fixture of the double-jaw, install the target soft material spline on the rear side of the upper fixture of the double-jaw, and fix the rigid material spline on the front side of the upper fixture of the double-jaw;

[0108] Set the clamping distance between the two ends of the target soft material spline to be not less than the preset distance L.

[0109] For the application of the embodiments of the present application, please refer to Figure 3 , Figure 3 is a schematic diagram of clamping distance control when the double-jaw fixture provided by the embodiments of the present application clamps the sample, showing the specific clamping conditions of the target soft material spline and the rigid material spline;

[0110] As Figure 3 shown, "6" represents the target soft material spline, and "7" represents the rigid material spline; the clamping distance between the two ends of the high-speed testing machine clamping the target soft material spline is not less than the preset distance L, that is, greater than or equal to "L0 + 2D m "; the clamping distance between the two ends of the high-speed testing machine clamping the rigid material spline is not less than the standard clamping distance L0;

[0111] Therefore, when both the upper and lower fixtures clamp the two splines with double-jaw fixtures, the self-weight of the fixture and the connecting piston rod cannot be transmitted or applied to the soft material spline to be tested, and are all supported by the rigid material; in order to ensure that when the two materials are loaded simultaneously, their forces and deformations are separated in the time dimension, it is necessary to control the actual clamping distance in the above manner, which helps to accurately adjust the non-overlapping signal characteristics.

[0112] In this embodiment S1.3, the appropriate clamping distance can ensure that during the test process, the material spline can be uniformly stressed, avoiding equipment damage caused by local stress concentration; by setting the clamping distance between the two ends of the target soft material spline to be not less than the preset distance, the influence of the rigid material spline on the target soft material spline during the stretching process can be avoided;

[0113] Moreover, speckle generation or pasting of marker points enables more accurate tracking and calculation of the deformation of the material spline in subsequent image analysis or displacement measurement, improving the accuracy of test data. In addition, adjusting the position of the spline according to the orientation of the camera can minimize the influence of light, shadow or perspective problems on the shooting quality, thereby ensuring that high-definition and accurate image records of the target soft material spline can be obtained during the shooting process.

[0114] S2. Perform high-speed tensile property tests on the target soft material spline and the rigid material spline through a high-speed testing machine, and generate a stress-strain curve of the target soft material spline according to the test data obtained.

[0115] Step S2 of the embodiment of the present application includes S2.1 to S2.2, specifically:

[0116] S2.1. Set the spline test parameters of the high-speed testing machine, such as spacing, test rate, acquisition frequency, etc.; adjust the parameters of the CCD camera and the light source; obtain clear images or marker points of the spline on the high-speed testing machine, and keep the camera exposure frequency the same as that of the high-speed testing machine;

[0117] Start the high-speed tensile property test program of the testing machine, control the high-speed testing machine to perform high-speed tensile property tests (high-speed stress-strain tests) on the target soft material spline and the rigid material spline to obtain the stress value data of the testing machine; meanwhile, based on the DIC (Digital Image Correlation) testing technology, monitor the image information through the CCD camera to obtain the camera image data. And during the whole testing process, the target soft material spline to be tested will not be affected by the self-weight of the fixture, the force value sensed by the force value sensor is the actual load borne by the two splines, and there is the force information of the auxiliary rigid material first, and then the force information of the soft material; the deformation is collected and analyzed by the CCD camera, and the force value and deformation can be accurately matched through time nodes, thereby completing the high-speed stress-strain test of the target soft material spline.

[0118] For the application of the embodiment of the present application, please refer to Figure 4 , Figure 4 is the force - test time curve graph of the double-jaw fixture clamping the auxiliary rigid material and the soft material to be tested provided by the embodiment of the present application, indicating the response of the target soft material spline and the rigid material spline under the action of force within a certain test time.

[0119] In this embodiment, by adjusting the parameters of the high-speed testing machine and the camera in S2.1, it can ensure that their performance and accuracy reach the best state during the testing process, thereby minimizing errors and uncertainties. By combining the engineering stress data and the engineering strain data and plotting the stress-strain curve, the processing and analysis process of the test data can be simplified, and the test efficiency can be improved;

[0120] Moreover, by using the DIC testing technology, the deformation information of the spline throughout the test process is obtained, overcoming the requirements of traditional testing technology for the deformation amount of the spline and the spatial requirements for contacting the spline, and completely solving the testing of the stress-strain curve of soft materials at high strain rates.

[0121] S2.2. Extract the data of the second segment from the stress value data of the testing machine to obtain the stress value data.

[0122] According to the stress value data and the cross-sectional area of the target soft material spline, the engineering stress data is calculated.

[0123] Calibrate the camera image data through an image analysis system, establish a virtual extensometer on the calibrated image, and obtain the virtual extensometer measurement specimen.

[0124] According to the length change of the virtual extensometer measurement specimen during the deformation process and the original length of the target soft material spline, the engineering strain data is calculated.

[0125] Combine the engineering stress data and the engineering strain data, and draw the stress-strain curve of the target soft material spline based on the combined data.

[0126] Among them, the high-speed testing machine is composed of a connecting piston rod, a force value sensor, and a double-jaw fixture including a double-jaw lower fixture and a double-jaw upper fixture. The following combines Figures 5 - 7 Make a specific description of the high-speed testing machine.

[0127] For the application of the embodiments of the present application, please refer to Figures 5 - 7 , Figure 5 is a schematic diagram of the double-jaw fixture device configured for the high-speed tensile equipment provided by the embodiments of the present application, showing the specific structure of the high-speed testing machine in Embodiment 1 of the present application;

[0128] Figure 6 is a schematic diagram of the installation structure of the double-jaw fixture device provided by the embodiments of the present application, showing the specific installation structure of the double-jaw fixture device (high-speed testing machine) configured for the high-speed tensile equipment in Embodiment 1 of the present application;

[0129] Figure 7 is a front view of the piston structure of the double-jaw fixture device provided by the embodiments of the present application, showing the front view of the piston structure of the double-jaw fixture device configured for the high-speed tensile equipment in Embodiment 1 of the present application.

[0130] As Figure 5 and Figure 6As shown in the figure, the high-speed stretching device is configured with a double-jaw fixture device, which includes a hydraulic power system 1, a support guide rod 2, a moving sleeve 3, a connecting piston rod 4, a double-jaw fixture 5 (including a lower double-jaw fixture and an upper double-jaw fixture), a target soft material spline 6, a rigid material spline 7, a force value sensor 8, a CCD camera 9, an automatic control and acquisition system 10, a movable clip 11 of the double-jaw fixture, a central fixed clip 12 of the double-jaw fixture, a fastening screw 13 of the double-jaw fixture, etc.;

[0131] Among them, through the movable clip 11 and the central fixed clip 12 of the double-jaw fixture 5, the rigid material spline 7 can be clamped, and the self-weights of the double-jaw fixture 5 and the connecting piston rod 4 can be fully borne;

[0132] Then, through the movable clip 11 and the central fixed clip 12 of the double-jaw fixture 5, the soft target soft material spline 6 is clamped;

[0133] By controlling the clamping distance in this misalignment test method, the target soft material spline and the rigid material spline are successively stressed and deformed, so as to obtain the stress and deformation information of the target soft material spline to generate a stress-strain curve.

[0134] For the application of the embodiments of the present application, please refer to Figures 8 - 10 ;

[0135] Figure 8 is the engineering strain - test time curve graph of the soft material to be measured analyzed by the CCD camera DIC provided by the embodiments of the present application, indicating the change of the engineering strain of the target soft material spline with time during the test process;

[0136] Figure 9 is the engineering stress - engineering strain curve graph of the soft material to be measured provided by the embodiments of the present application, indicating the corresponding change of the engineering stress of the target soft material spline with the engineering strain during the test process;

[0137] Figure 10 is the test flow chart provided by the embodiments of the present application, indicating the general process of the embodiments for performing high-speed tensile performance tests on the target soft material spline and the rigid material spline, and then obtaining the stress-strain curve of the target soft material spline.

[0138] In this embodiment, in S2.2, by extracting the stress value data within a preset time period, the unstable data in the initial stage of the test can be excluded, and the accuracy and representativeness of the data can be improved. Using a virtual extensometer to process the camera image data can avoid the errors that may be caused by the traditional physical extensometer contacting the test piece, thereby improving the accuracy of strain measurement.

[0139] Overall, this embodiment has the following beneficial effects:

[0140] By setting the clamping distance to be not less than a preset distance, this application can ensure that there is enough space for the target soft material spline to deform during the stretching process, avoiding stress concentration or limited deformation caused by over-tight clamping, thus affecting the accuracy of test results. Controlling the center line of the rigid material spline to coincide with the center line of the high-speed testing machine, this design enables the rigid material spline to provide a stable support and reference during the high-speed tensile performance test; due to the high strength and stiffness of the rigid material spline, it can better withstand and disperse the self-weight of the fixture and the connecting piston rod as well as other possible external interferences, making the force received by the target soft material spline during the test more uniform and consistent, reducing the potential interference of the fixture self-weight on the high-speed tensile performance test results. This method ensures that the test data is more pure, thus being able to more accurately reflect the mechanical properties of the target soft material spline;

[0141] In summary, this application uses a double-jaw fixture supplemented by a rigid material support to achieve the purpose of offsetting the self-weight of the fixture and the piston connecting rod, making the control results more accurate, scientific, and stable; and, by utilizing the characteristic of signal data staggering and through reasonable design, it realizes the segmented distributed loading of materials and can obtain real and effective performance data; in addition, this application uses the double-jaw fixture device and the testing method to solve the technical problem that soft materials such as thin films, rubbers, and plastics are easily affected by the self-weight of the fixture during testing, greatly improving the result accuracy and the overall detection ability range.

[0142] Embodiment 2:

[0143] Please refer to Figure 11 , an embodiment of this application provides a testing device for the high-speed tensile performance of soft materials, including an installation module 10 and a testing module 20;

[0144] Among them, the installation module 10 is used to install the target soft material spline to be tested in the double-jaw upper fixture of the high-speed testing machine and set the clamping distance to be not less than a preset distance; among them, a rigid material spline is fixed in the double-jaw upper fixture, and the center line of the rigid material spline coincides with the center line of the high-speed testing machine;

[0145] The testing module 20 is used to perform high-speed tensile performance tests on the target soft material spline and the rigid material spline through the high-speed testing machine and generate a stress-strain curve of the target soft material spline according to the test data obtained.

[0146] In one embodiment, the installation module 10 includes a size sub-unit, a stretching sub-unit, a calculation sub-unit, a fixing unit, a spacing unit, a speckle sub-unit, a clamping unit, and a setting unit, specifically:

[0147] A dimension sub-unit, configured to obtain a target soft material spline and a rigid material spline; wherein, the target soft material spline is a soft material and is the test object; the rigid material spline can be a weld mark spline formed during the injection molding process or a spline with a prefabricated notch, and the rigid material spline plays an auxiliary role and is mainly used for load bearing and support. It should be noted that the role of the rigid material spline is to provide a stable and strong enough support so as to accurately measure the performance of the target soft material spline during the test; however, if the displacement limit of the rigid material spline is too large, it may interfere with the test results of the target soft material spline; therefore, measures need to be taken to reduce its displacement limit. The role of the weld mark spline or the prefabricated notch is to reduce the displacement limit by reducing the strength of certain areas while ensuring the strength of the rigid material spline, so as to more accurately measure the performance of the target soft material spline; if a conventional spline can meet the corresponding displacement limit, strength requirements and test accuracy standards, a conventional spline can also be used for load bearing and support.

[0148] The dimension sub-unit is further configured to process the target soft material spline and the rigid material spline into dumbbell-shaped splines with the same preset standard size by injection molding or machining; place the target soft material spline and the rigid material spline under specific temperature and humidity conditions for a period of time to ensure that the splines reach a stable physical state and eliminate performance changes caused by environmental factors.

[0149] A tensile sub-unit, configured to perform a tensile property test on the rigid material spline according to the test target, and obtain the maximum force value F of the rigid material spline m and the displacement limit D m ; wherein, the maximum force value F m is greater than the self-weight of the double-jaw fixture and the connecting piston rod in the high-speed testing machine, and the double-jaw fixture includes an upper double-jaw fixture and a lower double-jaw fixture, and the displacement limit D m is less than the preset minimum value; when the test target is to obtain roughly, a quasi-static high-speed tensile property test can be performed, and when the test target is to obtain precisely, a high-speed tensile property test under the same conditions can be performed;

[0150] A calculation sub-unit, configured to calculate a preset distance L according to the preset standard clamping distance L0 and the displacement limit D of the rigid material spline m ; where L = L0 + 2D m .

[0151] For the application of the embodiments of the present application, please refer to Figure 2 , Figure 2 is the force-displacement curve diagram of the double-jaw fixture provided by the embodiments of the present application for pre-individually testing the auxiliary rigid material, which represents the relationship between the displacement (or deformation) and the external force during the force application process of the rigid material spline during the tensile property test.

[0152] In this embodiment, the dimension sub-unit, the stretching sub-unit, and the calculation sub-unit process two material splines into the same preset standard dimensions, which can ensure that they have the same stress area and geometric shape during the test, thus eliminating the test errors caused by dimensional differences.

[0153] Through the tensile property test, the maximum force value and displacement limit of the rigid material spline can be understood. Calculating the preset distance based on the displacement limit of the rigid material spline and the standard clamping distance can ensure that during the test, the material spline can be fully deformed without affecting the test results due to over-tight or over-loose clamping.

[0154] The fixing unit is used to fix the rigid material spline at the rear side of the upper fixture of the double clamping jaws and control the lower fixture of the double clamping jaws of the high-speed testing machine to clamp the lower end of the rigid material spline.

[0155] The spacing unit is used to set the clamping distance at both ends of the rigid material spline to be not less than the standard clamping distance L0 and control the center line of the rigid material spline to coincide with the center line of the high-speed testing machine. At this time, the self-weights of the lower clamp of the double clamping jaws and the connecting piston rod are all applied to the auxiliary rigid material spline, so as to achieve the full bearing of the self-weights of the double clamping jaw fixture and the connecting piston rod.

[0156] In this embodiment, the fixing unit and the spacing unit control the center line of the rigid material spline to coincide with the center line of the high-speed testing machine, so that the self-weights of the fixture and the connecting piston rod are all borne by the rigid material, thereby achieving the purpose of offsetting the self-weights of the fixture and the piston connecting rod. This method eliminates the potential interference of the self-weights of these components on the high-speed tensile property test results of the target soft material spline, ensures that the test data is purer, and thus can more accurately reflect the mechanical properties of the target soft material spline.

[0157] The speckle sub-unit is used to spray speckles or mark the target soft material spline, so that evenly distributed speckle points or pasted marking points are formed on the surface of the target soft material spline for the CCD camera and the image analysis system using digital image technology to identify and obtain image information; among them, the "CCD camera", the full name is Charge-Coupled Device camera, that is, a charge-coupled device camera, which is a camera using a CCD (charge-coupled device) as an image sensor.

[0158] A clamping unit is used to install the processed target soft material spline on the front side of the upper fixture of the double clamping jaws in a high-speed testing machine, and enable the lower fixture of the double clamping jaws of the high-speed testing machine to clamp the lower end of the target soft material spline. Among them, the installation positions of the target soft material spline and the rigid material spline are determined according to the orientation of the CCD camera. Specifically, if the CCD camera is in front of the upper fixture of the double clamping jaws, the target soft material spline is installed on the front side of the upper fixture of the double clamping jaws, and the rigid material spline is fixed on the rear side of the upper fixture of the double clamping jaws; if the CCD camera is behind the upper fixture of the double clamping jaws, the target soft material spline is installed on the rear side of the upper fixture of the double clamping jaws, and the rigid material spline is fixed on the front side of the upper fixture of the double clamping jaws.

[0159] A setting unit is used to set the clamping distance between the two ends of the target soft material spline to be not less than a preset distance L.

[0160] For applying the embodiments of the present application, please refer to Figure 3 , Figure 3 is a schematic diagram of clamping distance control when the double clamping jaw fixture provided by the embodiment of the present application clamps a sample, showing the specific clamping conditions of the target soft material spline and the rigid material spline;

[0161] As Figure 3 shown, "6" represents the target soft material spline, and "7" represents the rigid material spline; the clamping distance between the two ends of the target soft material spline clamped by the high-speed testing machine is not less than the preset distance L, that is, greater than or equal to "L0 + 2D m "; the clamping distance between the two ends of the rigid material spline clamped by the high-speed testing machine is not less than the standard clamping distance L0;

[0162] Therefore, when both the upper and lower fixtures clamp the two splines with double clamping jaw fixtures, the self-weight of the fixture and the connecting piston rod cannot be transmitted or applied to the soft material spline to be tested, and are all supported by the rigid material. In order to ensure that when the two materials are loaded simultaneously, their forces and deformations are separated in the time dimension, it is necessary to control the actual clamping distance in the above manner, which helps to accurately adjust the non-overlapping signal characteristics.

[0163] In the speckle sub-unit, clamping unit and setting unit of this embodiment, an appropriate clamping distance can ensure that the material spline is evenly stressed during the test, and avoid equipment damage caused by local stress concentration; by setting the clamping distance between the two ends of the target soft material spline to be not less than the preset distance, the influence of the rigid material spline on the target soft material spline during the stretching process can be avoided;

[0164] Moreover, making or pasting speckle markers can enable more accurate tracking and calculation of the deformation of the material spline in subsequent image analysis or displacement measurement, improving the accuracy of test data. In addition, adjusting the position of the spline according to the orientation of the camera can minimize the influence of light, shadow or perspective problems on the shooting quality, thereby ensuring that high-definition and accurate image records of the target soft material spline can be obtained during the shooting process.

[0165] In one embodiment, the test module 20 includes an adjustment unit, a test unit, a picking sub-unit, a stress sub-unit, a calibration sub-unit, a strain sub-unit and a curve unit, specifically:

[0166] The adjustment unit is used to set the spline test parameters of the high-speed testing machine, such as spacing, test rate and acquisition frequency, etc.; adjust the parameters of the CCD camera and the light source; obtain clear images or markers of the spline on the high-speed testing machine, and keep the camera exposure frequency the same as that of the high-speed testing machine;

[0167] The test unit is used to start the high-speed tensile performance test program of the testing machine, control the high-speed testing machine to perform high-speed tensile performance tests (high-speed stress-strain tests) on the target soft material spline and the rigid material spline, and obtain the stress value data of the testing machine. At the same time, based on the DIC (Digital Image Correlation) testing technology, monitor the image information through the CCD camera to obtain the camera image data. And during the whole test process, the target soft material spline to be tested will not be affected by the self-weight of the fixture, the force value sensed by the force sensor is the actual load borne by the two splines, and there is the force information of the auxiliary rigid material first, and then the force information of the soft material. The deformation is collected and analyzed by the CCD camera, and the force value and deformation can be accurately matched through time nodes, so as to complete the high-speed stress-strain test of the target soft material spline.

[0168] For applying the embodiments of the present application, please refer to Figure 4 , Figure 4 is the force-testing time curve graph of the double-jaw fixture clamping the auxiliary rigid material and the soft material to be tested provided by the embodiments of the present application, indicating the response of the target soft material spline and the rigid material spline under the action of force within a certain test time.

[0169] In this embodiment, the adjustment unit and the test unit can ensure that their performance and accuracy reach the best state during the test process by adjusting the parameters of the high-speed testing machine and the camera, thereby minimizing errors and uncertainties to the greatest extent. By combining the engineering stress data and the engineering strain data and plotting the stress-strain curve, the processing and analysis process of the test data can be simplified and the test efficiency can be improved;

[0170] Moreover, using the DIC testing technique to obtain the deformation information of the spline throughout the test process overcomes the requirements of traditional testing techniques for the deformation amount of the spline and the spatial requirements for contacting the spline, and completely solves the testing of the stress-strain curve of soft materials at high strain rates.

[0171] The extraction subunit is used to extract the data of the second segment from the stress value data of the testing machine to obtain the stress value data.

[0172] The stress subunit is used to calculate the engineering stress data based on the stress value data and the cross-sectional area of the target soft material spline.

[0173] The calibration subunit is used to calibrate the camera image data through the image analysis system, and establish a virtual extensometer on the calibrated image to obtain the virtual extensometer measurement specimen.

[0174] The strain subunit is used to calculate the engineering strain data based on the length change of the virtual extensometer measurement specimen during the deformation process and the original length of the target soft material spline.

[0175] The curve subunit is used to merge the engineering stress data and the engineering strain data, and draw the stress-strain curve of the target soft material spline based on the merged data.

[0176] Among them, the high-speed testing machine is composed of a connecting piston rod, a force value sensor, and a double-jaw fixture including a double-jaw lower fixture and a double-jaw upper fixture. The following combines Figures 5 - 7 to make a specific description of the high-speed testing machine.

[0177] For the application of the embodiments of the present application, please refer to Figures 5 - 7 , Figure 5 is a schematic diagram of the double-jaw fixture device configured for the high-speed tensile equipment provided by the embodiments of the present application, showing the specific structure of the high-speed testing machine in the second embodiment;

[0178] Figure 6 is an installation structure schematic diagram of the double-jaw fixture device provided by the embodiments of the present application, showing the specific installation structure of the double-jaw fixture device (high-speed testing machine) configured for the high-speed tensile equipment in the second embodiment;

[0179] Figure 7 is a front view of the piston structure of the double-jaw fixture device provided by the embodiments of the present application, showing the front view of the piston structure of the double-jaw fixture device configured for the high-speed tensile equipment in the second embodiment.

[0180] As Figure 5 and Figure 6As shown in the figure, the high-speed stretching device is configured with a double-jaw fixture device, which includes a hydraulic power system 1, a support guide rod 2, a moving sleeve 3, a connecting piston rod 4, a double-jaw fixture 5 (including a lower double-jaw fixture and an upper double-jaw fixture), a target soft material spline 6, a rigid material spline 7, a force value sensor 8, a CCD camera 9, an automatic control and acquisition system 10, a movable clip 11 of the double-jaw fixture, a central fixed clip 12 of the double-jaw fixture, a fastening screw 13 of the double-jaw fixture, etc.;

[0181] Among them, through the movable clip 11 and the central fixed clip 12 of the double-jaw fixture 5, the rigid material spline 7 can be clamped to fully bear the self-weights of the double-jaw fixture 5 and the connecting piston rod 4;

[0182] Then, through the movable clip 11 and the central fixed clip 12 of the double-jaw fixture 5, the soft target soft material spline 6 is clamped;

[0183] By controlling the clamping distance in this misalignment test method, the target soft material spline and the rigid material spline are successively stressed and deformed, so as to obtain the stress and deformation information of the target soft material spline to generate a stress-strain curve.

[0184] For the application of the embodiments of the present application, please refer to Figures 8 - 10 ;

[0185] Figure 8 is the engineering strain - test time curve graph of the soft material to be tested analyzed by the CCD camera DIC provided by the embodiments of the present application, indicating the change of the engineering strain of the target soft material spline with time during the test process;

[0186] Figure 9 is the engineering stress - engineering strain curve graph of the soft material to be tested provided by the embodiments of the present application, indicating the corresponding change of the engineering stress of the target soft material spline with the engineering strain during the test process;

[0187] Figure 10 is the test flow chart provided by the embodiments of the present application, indicating the general process of the second embodiment for performing high-speed tensile performance tests on the target soft material spline and the rigid material spline, and then obtaining the stress-strain curve of the target soft material spline.

[0188] In this embodiment, the extraction sub-unit, stress sub-unit, calibration sub-unit, strain sub-unit, and curve unit can exclude unstable data in the initial stage of the test by extracting stress value data within a preset time period, improving the accuracy and representativeness of the data. Using a virtual extensometer to process the camera image data can avoid the errors that may be caused by the traditional physical extensometer contacting the test piece, thereby improving the accuracy of strain measurement.

[0189] Overall, this embodiment has the following beneficial effects:

[0190] By setting the clamping distance to be not less than the preset distance in this application, it can ensure that there is sufficient space for deformation of the target soft material spline during the stretching process, avoiding stress concentration or limited deformation caused by over-tight clamping, thereby affecting the accuracy of the test results. Controlling the center line of the rigid material spline to coincide with the center line of the high-speed testing machine, this design enables the rigid material spline to provide a stable support and reference during the high-speed tensile property test; due to the high strength and stiffness of the rigid material spline, it can better withstand and disperse the self-weight of the fixture and the connecting piston rod as well as other possible external interferences, making the force received by the target soft material spline during the test more uniform and consistent, reducing the potential interference of the fixture self-weight on the high-speed tensile property test results. This method ensures that the test data is more pure, and thus can more accurately reflect the mechanical properties of the target soft material spline;

[0191] In summary, this application uses a double-jaw fixture supplemented by a rigid material support to achieve the purpose of offsetting the self-weight of the fixture and the piston connecting rod, making the control result more accurate, scientific and stable; and, by taking advantage of the characteristic of signal data staggering and through reasonable design, it realizes the segmented distributed loading of materials and can obtain real and effective performance data; in addition, this application uses the double-jaw fixture device and the test method to solve the technical problem that soft materials such as thin films, rubbers and plastics are easily affected by the self-weight of the fixture during the test, greatly improving the result accuracy and the overall detection ability range.

[0192] Embodiment 3:

[0193] The embodiment of this application provides a computer-readable storage medium, the computer-readable storage medium includes a stored computer program, wherein, when the computer program runs, it controls the device where the computer-readable storage medium is located to execute the described test method for the high-speed tensile properties of soft materials;

[0194] Among them, for the testing method of the high-speed tensile performance of the soft material, when it is implemented in the form of software functional units and used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present invention, it can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0195] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A method for testing high-speed tensile properties of soft materials, characterized in that: include: The target soft material spline to be tested is installed in the double-jaw upper fixture of the high-speed testing machine, and the clamping spacing is set to be not less than a preset distance; wherein a rigid material spline is fixed in the double-jaw upper fixture, and the center line of the rigid material spline coincides with the center line of the high-speed testing machine; The high-speed testing machine is used to perform a high-speed tensile performance test on the target soft material spline and the rigid material spline, and a stress-strain curve of the target soft material spline is generated according to the test data.

2. A method for testing high-speed tensile properties of soft materials as claimed in claim 1, characterized in that: Install the target soft material specimen to be tested in the double-jaw upper fixture of the high-speed testing machine, and set the clamping distance to be no less than the preset distance, specifically: Preprocessing the target soft material spline and the rigid material spline; Install the target soft material spline on the front side of the double-jaw upper fixture in the high-speed testing machine, and make the double-jaw lower fixture of the high-speed testing machine clamp the lower end of the target soft material spline; The clamping distance between both ends of the target soft material spline is set to be no less than a preset distance; wherein the preset distance is calculated based on a preset standard clamping distance and a displacement limit of the rigid material spline.

3. A method for testing high-speed tensile properties of soft materials as claimed in claim 2, characterized in that: The target soft material spline and the rigid material spline are preprocessed, specifically: Processing the target soft material spline and the rigid material spline into the same preset standard size; The target soft material spline is subjected to speckle production, so that evenly distributed speckle spots or sticking marking points are formed on the surface of the target soft material spline.

4. A method for testing high-speed tensile properties of soft materials as claimed in claim 2, characterized in that: The preset distance is calculated based on the preset standard clamping distance and the displacement limit of the rigid material spline, specifically: Performing a tensile performance test on the rigid material spline to obtain the maximum force value and the displacement limit of the rigid material spline; wherein the maximum force value is greater than the deadweight of the double-jaw clamp and the connecting piston rod in the high-speed testing machine, the double-jaw clamp includes the double-jaw upper clamp and the double-jaw lower clamp, and the displacement limit is less than a preset minimum value; The preset distance is calculated based on the standard clamping distance and the displacement limit of the rigid material spline.

5. A method for testing high-speed tensile properties of soft materials as claimed in claim 1, characterized in that: A rigid material spline is fixed in the double-jaw upper fixture, and the center line of the rigid material spline coincides with the center line of the high-speed testing machine, specifically: Fixing the rigid material spline on the rear side of the double-jaw upper fixture, and controlling the double-jaw lower fixture of the high-speed testing machine to clamp the lower end of the rigid material spline; The clamping spacing between the two ends of the rigid material spline is set to be no less than a preset standard clamping spacing, and the center line of the rigid material spline is controlled to coincide with the center line of the high-speed testing machine.

6. A method for testing high-speed tensile properties of soft materials as claimed in claim 1, characterized in that: The high-speed testing machine is used to perform a high-speed tensile performance test on the target soft material spline and the rigid material spline, and a stress-strain curve of the target soft material spline is generated according to the test data, specifically: Adjusting parameters of the high-speed testing machine and the camera; Performing a high-speed tensile performance test on the target soft material spline and the rigid material spline by the high-speed testing machine to obtain testing machine stress value data and camera image data; Performing stress calculation and strain calculation on the stress value data of the testing machine and the camera image data respectively to obtain engineering stress data and engineering strain data; The engineering stress data and the engineering strain data are combined, and a stress-strain curve of the target soft material spline is drawn according to the combined data.

7. A method for testing high-speed tensile properties of soft materials as claimed in claim 6, characterized in that: Stress calculation and strain calculation are performed on the stress value data of the testing machine and the camera image data respectively to obtain engineering stress data and engineering strain data, specifically: Extracting data of a preset time period from the stress value data of the testing machine to obtain stress value data; Calculating the engineering stress data according to the stress value data and the cross-sectional area of ​​the target soft material spline; Calibrate the camera image data, establish a virtual extensometer on the calibrated image, and obtain a virtual extensometer measurement sample; The engineering strain data is calculated based on the length change of the sample measured by the virtual extensometer during the deformation process and the original length of the target soft material spline.

8. A method for testing high-speed tensile properties of soft materials as claimed in claim 1, characterized in that: The high-speed testing machine is composed of a connecting piston rod, a force sensor, and a double-jaw clamp including a double-jaw lower clamp and a double-jaw upper clamp; Wherein, when the high-speed testing machine clamps the rigid material spline, the double-jaw fixture and the connecting piston rod are controlled to bear all their own weight.

9. A test device for high-speed tensile properties of soft materials, characterized in that: Includes installation module and test module; The installation module is used to install the target soft material spline to be tested in the double-jaw upper fixture of the high-speed testing machine, and set the clamping distance to be not less than a preset distance; wherein a rigid material spline is fixed in the double-jaw upper fixture, and the center line of the rigid material spline coincides with the center line of the high-speed testing machine; The testing module is used to perform a high-speed tensile performance test on the target soft material spline and the rigid material spline through the high-speed testing machine, and generate a stress-strain curve of the target soft material spline according to the test data.

10. A storage medium, characterized in that: The storage medium stores a computer program, which is called and executed by a computer to implement a method for testing high-speed tensile properties of a soft material as described in any one of claims 1 to 8.

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