Collision test equipment, test method and simulation method

Abstract

The invention discloses collision test equipment, a test method and a simulation method, and the method comprises the steps: constructing a plurality of sample simulation models with different grid sizes according to a to-be-tested sample plate; constructing a punch simulation model according to the punch; simulating a static collision process by utilizing each sample simulation model and the punch simulation model, and determining simulated plastic strain in the simulated collision process corresponding to each sample simulation model; and according to the simulated plastic strain of the plurality of sample simulation models, determining the incidence relation between the grid size and the fracture strain correlation coefficient. The actual collision test process is simulated in a simulation mode, the relation between the fracture strain correlation coefficient and the grid size can be determined, and then a basis for selecting the grid size of a simulation model can be provided for a corresponding material; therefore, the situation that the whole necking and fracture process cannot be accurately described due to the fact that the number of the grids is small can be reduced, and the gap between the simulation process and the actual test process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of material testing, and in particular to a collision testing device, a testing method and a simulation method. Background Art

[0002] Metal sheets are indispensable materials in daily life and production operations, and the structural properties of metal sheets play a decisive role in their application. Simulation models are usually used to analyze the structural properties of metal sheets, and the mesh size of the metal sheet model has a great influence on the simulation results. The simulation results of the same metal sheet model using different mesh sizes are quite different. Therefore, how to select a suitable mesh size for the metal sheet model to improve the accuracy of the metal sheet structural performance analysis is an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a collision test device, a test method and a simulation method, thereby solving the technical problem in the prior art that a suitable grid size cannot be selected for a metal sheet model, resulting in low accuracy in the analysis of the structural performance of the metal sheet, and achieving the technical effect of improving the accuracy of the analysis of the structural performance of the metal sheet.

[0004] In a first aspect, the present application provides a collision test device, comprising a fixed base and a slide rail block; the middle of the fixed base and the middle of the slide rail block are both cavities;

[0005] The cavity in the middle of the slide rail block overlaps with the cavity of the fixed base, and the frames at both ends of the slide rail block are movably bridged to the frames of the fixed base through base fasteners;

[0006] The collision test equipment is used to dismantle the base fasteners during the collision test to separate the fixed base and the slide block, place the sample plate to be tested between the fixed base and the slide block, and then movably fix the fixed base and the slide block through the base fasteners, so that the sample plate to be tested is statically collided by the punch while being fixedly clamped by the fixed base and the slide block.

[0007] Furthermore, the device also includes two support rollers; both ends of each support roller are placed in the cavity in the middle of the slide rail block and bridged to the frame of the slide rail block.

[0008] Furthermore, a slide groove is arranged on the frame of the slide rail block, and locking components are arranged at both ends of each support roller. Each support roller is movably connected to the slide groove on the frame of the slide rail block through the locking components at both ends.

[0009] Furthermore, a scale and a middle position marker are arranged on the frame of the slide rail block provided with the slide groove.

[0010] Furthermore, a groove is provided on the frame of the fixed base, and the frames at both ends of the slide rail block are bridged in the groove on the frame of the fixed base.

[0011] In a second aspect, the present application provides a collision test method, which is applied to a collision test device provided in the first aspect, and the method comprises:

[0012] Remove the base fasteners to separate the fixed base and the slide rail block;

[0013] Place the sample plate to be tested between the fixed base and the slide block;

[0014] The fixed base and the slide block are movably fixed by the base fasteners so that the fixed base and the slide block clamp the sample plate to be tested;

[0015] When the sample plate to be tested is fixedly clamped by the fixed base and the slide rail block, the punch is controlled to statically collide with the sample plate to be tested from a direction perpendicular to the plane where the sample plate to be tested is located;

[0016] The actual load data, actual displacement data and actual plastic strain of the test sample plate during the static collision process are detected, and the test result of the test sample plate is determined according to the actual load data, actual displacement data and actual plastic strain.

[0017] Furthermore, when the punch performs static collision on the test sample plate, the blade direction of the punch is perpendicular to the long axis direction of the test sample plate, and the blade direction of the punch coincides with the short axis of the cavity in the middle of the slide rail block.

[0018] Furthermore, if the collision test equipment is provided with two supporting rollers, when the sample plate to be tested is fixedly clamped by the fixed base and the slide rail block, the distance between the two supporting rollers is adjusted to a preset distance, and the preset distance is determined according to the radius of the two supporting rollers and the yield strength and tensile strength of the sample plate to be tested.

[0019] Furthermore, during the process of the punch performing a static collision on the test sample plate, the method further comprises:

[0020] When the actual load data is less than or equal to the preset threshold, the static collision process is terminated.

[0021] In a third aspect, the present application provides a collision test simulation method. Based on the static collision process of a collision test method provided in the second aspect, the simulation method includes:

[0022] According to the sample plate to be tested, multiple sample simulation models with different grid sizes are constructed;

[0023] According to the punch, a punch simulation model is constructed;

[0024] Using each specimen simulation model and the punch simulation model to simulate a static collision process, and determining a simulated plastic strain in the simulated collision process corresponding to each specimen simulation model;

[0025] According to the simulated plastic strain of multiple specimen simulation models, the correlation between the mesh size and the fracture strain correlation coefficient is determined.

[0026] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0027] This embodiment constructs a simulation model based on the test sample plate and process parameters of the actual collision test process. By simulating the actual collision test process in a simulation manner, the relationship between the fracture strain correlation coefficient and the grid size can be determined, and then a basis for selecting the grid size of the simulation model for the corresponding material can be provided, thereby reducing the inability to accurately describe the entire necking and fracture process due to a small number of grids, and reducing the gap between the simulation process and the actual test process; in addition, it can also provide a basis for selecting the grid size for the simulation model of ultra-high strength materials, increase the tensile displacement in the simulation process, and improve the accuracy of the simulation analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic diagram of the overall structure of a collision test device provided in this application;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure of the fixed base;

[0031] Figure 3 for Figure 1 A schematic diagram of the structure of a sliding block without a supporting roller;

[0032] Figure 4 for Figure 1 A schematic diagram of the structure of a sliding block with a supporting roller;

[0033] Figure 5 for Figure 1 Schematic diagram of the structure of the middle support roller;

[0034] Figure 6 for Figure 5 A schematic diagram of the structure of the middle sliding card block;

[0035] Figure 7 A schematic diagram of a collision test method provided in this application;

[0036] Figure 8 for Figure 7 Schematic diagram of the relationship between force and displacement during the collision process corresponding to the method shown;

[0037] Fig. 9 A schematic diagram of a flow chart of a collision test simulation method provided in this application;

[0038] Fig.10 for Fig. 9 Schematic diagram of the relationship between the effect correlation coefficient and the mesh size obtained in the simulation method shown.

[0039] Reference numerals:

[0040] 101-slide rail block, 102-support roller, 103-fixed base, 104-support roller, 105-base fastener, 106-punch, 107-test sample plate, 108-locking bolt, 110-locking card, 111-sliding card block, 112-fixed bearing, 113-card block pin, 114-ruler, 115-middle position marker. DETAILED DESCRIPTION

[0041] The embodiments of the present application provide a collision test device, a test method and a simulation method to solve the technical problem in the prior art that a suitable grid size cannot be selected for a metal sheet model, resulting in low accuracy in the analysis of the structural performance of the metal sheet.

[0042] The technical solution of the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0043] A collision test simulation method is based on a static collision process of a collision test method. The simulation method includes: constructing multiple sample simulation models with different grid sizes according to a sample plate 107 to be tested; constructing a punch simulation model according to a punch 106; simulating the static collision process using each sample simulation model and the punch simulation model to determine the simulated plastic strain in the simulated collision process corresponding to each sample simulation model; and determining the correlation between the grid size and the fracture strain correlation coefficient according to the simulated plastic strain of the multiple sample simulation models.

[0044] A collision test simulation method provided in this embodiment can determine the relationship between the fracture strain correlation coefficient and the grid size, and then provide a basis for selecting the grid size of the simulation model for the corresponding material, thereby reducing the inability to accurately describe the entire necking and fracture process due to a small number of grids, and reducing the gap between the simulation process and the actual test process; in addition, it can also provide a basis for selecting the grid size for the simulation model of ultra-high strength materials, increase the tensile displacement in the simulation process, and improve the accuracy of the simulation analysis.

[0045] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] First of all, the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] Metal sheets are indispensable materials in daily life and production operations, and the structural properties of metal sheets play a decisive role in their application.

[0048] Different metal sheets have different properties. For example, compared with traditional high-strength dual-phase steel, the microstructure of enhanced plasticity high-strength steel introduces a small amount of bainite or residual austenite (about 3% to 10%) on the basis of the original ferrite and martensite. This makes it exhibit higher elongation and work hardening index than traditional dual-phase steel, and presents better plasticity. It is suitable for body load-bearing structural parts and safety parts, especially for structural safety parts with complex shapes.

[0049] Simulation models are usually used to analyze the structural properties of metal sheets. The mesh size of the metal sheet model has a great influence on the simulation results. The simulation results of the same metal sheet model using different mesh sizes vary greatly.

[0050] For example, for the same metal sheet model, when a large-size grid is used (usually a grid size of 8-10mm), the overall size of the metal sheet model is relatively small, resulting in a small number of grids. At the same time, when a large-size grid is used for the simulation model of ultra-high strength materials (tensile strength grade ≥980MPa), the displacement generated is small, which is very different from the actual metal sheet in the actual static collision process, and thus it is impossible to accurately describe the necking and fracture in the entire static collision process, and it is also impossible to accurately determine the structural properties of the metal sheet.

[0051] Therefore, how to select a suitable mesh size for the metal sheet model to improve the accuracy of metal sheet structural performance analysis is a problem that needs to be solved urgently.

[0052] In order to solve the above problems, this embodiment provides Figure 1-Figure 6 A collision test device shown, based on Figure 1-Figure 6 The collision device shown provides Figure 7 A collision test method is shown, in which a static collision test is performed on the sample plate 107 to be tested, and finally the following is provided: Fig. 9 A collision test simulation method is shown, namely based on Figure 7 The static collision process involved in the collision test method shown is simulated to determine the correlation between the mesh size of the simulation model and the fracture strain correlation coefficient, and then the appropriate mesh size can be selected for the metal sheet model based on the correlation.

[0053] The following description is given in the order of a collision test device, a collision test method and a collision test simulation method.

[0054] like Figure 1 As shown, a collision test device provided by the present application is shown. Figure 1 A collision test device is shown comprising Figure 2 The fixed base 103 and Figure 3 The slide rail block 101 is shown.

[0055] The shape of the fixed base 103 can be a circular ring or a rectangular frame. Figure 1 and Figure 2 The outer shape of the slide rail block 101 can also be a rectangular frame or other shapes. Figure 1 and Figure 3 The rectangular box shown is used as an example for explanation.

[0056] The middle of the fixed base 103 and the middle of the slide block 101 are both hollow. When the fixed base 103 and the slide block 101 are assembled, the hollow in the middle of the slide block 101 overlaps with the hollow in the fixed base 103, and the frames at both ends of the slide block 101 can be movably bridged to the frames of the fixed base 103 through the base fasteners 104. The base fasteners 104 can be bolts. Figure 1 As shown, the base fastener 104 may employ a plurality of fastening bolts.

[0057] according to Figure 2 It can be seen that a groove is provided on the frame of the fixed base 103. Figure 1It can be known that the frames at both ends of the slide rail block 101 are bridged in the grooves on the frame of the fixed base 103. That is, there are two grooves on the fixed base 103, and the two grooves are symmetrical about the center of the fixed base 103.

[0058] according to Figure 1 It can be seen that two support rollers 102 , 104 are arranged on the slide block 101 ; both ends of each support roller 102 , 104 are placed in the cavity in the middle of the slide block 101 and bridged on the frame of the slide block 101 .

[0059] like Figure 3 and Figure 4 As shown, a slide groove is provided on the frame of the slide block 101, and locking components are provided at both ends of each support roller 102, 104. Each support roller 102, 104 is movably connected to the slide groove on the frame of the slide block 101 through the locking components at both ends, so that the two support rollers 102, 104 can slide on the slide block 101 to change the distance between the two support rollers 102, 104.

[0060] In addition, a scale 114 and a middle position marker 115 are provided on the frame of the slide block 101 with the slide groove, which can be used as a reference for the distance of the moving support rollers 102, 104. The spacing between the two support rollers 102, 104 can be adjusted according to the needs of testing the strength and thickness of the material.

[0061] Support rollers 102, 104 are as follows Figure 5 As shown, locking components are provided on both sides, and the locking components include a block pin 113, a fixed bearing 112, a locking card 110, a sliding block 111 and a locking bolt 108. Fixed bearings 112 are respectively installed at both ends of the support rollers 102 and 104. The support rollers 102 and 104 and the fixed bearings 112 are interference fit. The distance between the end faces of the support rollers 102 and 104 and the end faces of the fixed bearings 112 can be 1.0 to 2.0 mm. The fixed bearings 112 are installed in the mounting holes on the side of the sliding block 111 (such as Figure 6 As shown in the figure, the two are interference fit, and the exposed end faces of the fixed bearing 112 and the sliding block 111 are flush. The sliding block 111 is inserted into the slide groove on the inner side of the slide rail block 101. The lower end of the block pin 113 is pre-threaded, passes through the slide groove reserved on the upper side of the slide rail block 101, and is inserted into the bolt hole on the upper end face of the sliding block 111. The upper end of the block pin 113 penetrates into the cylindrical hole reserved for the locking card 110; the outer side of the locking card 110 is reserved with a light hole, and is fixed in the slide groove on the outer side of the slide rail block 101 by the locking bolt 108.

[0062] When the support rollers 102 and 104 need to be moved, the locking bolt 108 can be screwed outward for a certain distance, so that the locking bolt 108 is disengaged from the sliding block 111, and the support rollers 102 and 104 can be moved along the slide groove. When the support rollers 102 and 104 need to be fixed, the locking bolt 108 can be screwed inward for a certain distance, so that the locking bolt 108 contacts the sliding block 111 and generates a certain interaction force, and the support rollers 102 and 104 are fixed.

[0063] When using the collision test equipment, the base fastener 104 connecting the fixed base 103 and the slide block 101 can be detached so that the fixed base 103 and the slide block 101 can be separated; then the sample plate 107 to be tested is bridged on the fixed base 103, specifically, the two ends of the sample plate 107 to be tested are respectively placed in the groove of the fixed base 103 and between the slide block 101; then the slide block 101 covers the sample plate 107 to be tested; finally, the fixed base 103 and the slide block 101 are movably fixed by the base fastener 104, so that the fixed base 103 and the slide block 101 clamp the sample plate 107 to be tested, and then the sample plate 107 to be tested is statically collided by the punch 106 while being fixedly clamped by the fixed base 103 and the slide block 101.

[0064] like Figure 7 As shown, a collision test method is provided for the present application, which is applied to a collision test device as provided above, and the method includes steps S71 to S75.

[0065] Step S71, detaching the base fastener 104 to separate the fixed base 103 and the slide rail block 101;

[0066] Step S72, placing the sample plate 107 to be tested between the fixed base 103 and the slide rail block 101;

[0067] Step S73, movably fixing the fixed base 103 and the slide rail block 101 by the base fastener 104, so that the fixed base 103 and the slide rail block 101 clamp the sample plate 107 to be tested;

[0068] Step S74, when the test sample plate 107 is fixedly clamped by the fixed base 103 and the slide rail block 101, the punch 106 is controlled to statically collide with the test sample plate 107 in a direction perpendicular to the plane where the test sample plate 107 is located;

[0069] Step S75 , detecting actual load data, actual displacement data and actual plastic strain of the test sample plate 107 during the static collision process, and determining the test result of the test sample plate 107 according to the actual load data, actual displacement data and actual plastic strain.

[0070] When the fixed base 103 is movably connected to the slide block 101, step S71 is performed, that is, the base fastener 104 is detached to separate the fixed base 103 and the slide block 101. It should be noted that the detached base fastener 104 can only be the fastener connecting the fixed base 103 and the slide block 101.

[0071] Before executing step S72, it is necessary to prepare the test sample plate 107. The thickness of the test sample plate 107 can be selected according to actual conditions. The size of the test sample plate 107 can be any size that can match the fixed base 103 and the slide block 101. For example, the size of the test sample plate 107 is the maximum size of the overlapping area of ​​the fixed base 103 and the slide block 101, such as 120mm*260mm. The test sample plate 107 is cut according to the determined size, and the cut test sample plate 107 can be subjected to burr removal and burr removal operations to avoid cracking of the test sample plate 107 at the location of the burrs or burrs, so as to prevent the burrs and burrs from affecting the static collision test results. In addition, marking points with black spots on a white background can be sprayed on the test sample plate 107. The size of the marking points should not be too large (maximum diameter ≤ 0.5 mm). Then, a DIC (Digital Image Correlation) high-speed camera can be used to shoot the changes of the test sample plate 107 during the test to obtain corresponding test data.

[0072] After the test sample plate 107 is prepared, step S72 is executed to place the two ends of the test sample plate 107 in the two grooves of the fixed base 103 respectively, and the slide block 101 is covered on the test sample plate 107. It should be noted that the two ends of the slide block 101 are still fully or partially sunk into the grooves of the fixed base 103, so that the test sample plate 107 is sandwiched between the fixed base 103 and the slide block 101.

[0073] Continuing to step S73 , the base fastener 104 detached in step S71 is passed through the corresponding through hole again, so that the fixed base 103 , the sample plate 107 to be tested and the slide rail block 101 are fixed together.

[0074] Before executing step S74, if the collision test equipment is provided with two support rollers 102, 104, when the to-be-tested sample plate 107 is fixedly clamped by the fixed base 103 and the slide block 101, the distance between the two support rollers 102, 104 is adjusted to a preset distance, and the preset distance is determined according to the radius of the two support rollers 102, 104, the yield strength and tensile strength of the to-be-tested sample plate 107, and the middle of the two support rollers 102, 104 coincides with the short axis of the middle cavity of the slide block 101. The calculation formula of the preset distance can refer to Formula 1.

[0075]

[0076] Wherein, d is the preset distance, r is the radius of the support rollers 102, 104; σ0 is the yield strength of the sample plate 107 to be tested, σ s is the tensile strength of the sample plate 107 to be tested; and t is the thickness of the sample plate 107 to be tested.

[0077] Continue to execute step S74. After the fixed base 103, the sample plate 107 to be tested and the slide block 101 are fixed together, the punch 106 is used to perform a static collision test on the sample plate 107 to be tested. During the process of the punch 106 performing a static collision test on the sample plate 107, the moving direction of the punch 106 is perpendicular to the plane where the sample plate 107 to be tested is located, the blade direction of the punch 106 is perpendicular to the long axis direction of the sample plate 107 to be tested, and the blade direction of the punch 106 coincides with the short axis of the cavity in the middle of the slide block 101. That is, the blade direction of the punch 106 is parallel to the axis of the support rollers 102 and 104; the two ends of the blade of the punch 106 are aligned with the middle position marker 115 on the upper surface of the slide block 101.

[0078] During the actual test, the fixed base 103 can be driven to move toward the punch 106, or the punch 106 can be driven to move toward the fixed base 103, or the fixed base 103 and the punch 106 can be driven to move toward each other at the same time. The power can be provided by a hydraulic forming test machine (e.g., a BUP1000 hydraulic forming test machine) or other stamping forming simulation equipment.

[0079] When the punch 106 performs static collision on the test sample plate 107 , the DIC high-speed camera is aimed at the test sample plate 107 , and the DIC high-speed camera mainly photographs the test sample plate 107 between the two support rollers 102 , 104 .

[0080] When the punch 106 performs a static collision on the test sample plate 107 , the slow loading speed of the punch 106 can be set to 0.2-0.3 mm / s.

[0081] Step S75 can be implemented during the execution of step S74, that is, during the detection of static collision, the actual load data, actual displacement data and actual plastic strain of the test sample plate 107 are detected. Of course, step S75 can also be performed after executing step S74, by determining the actual load data, actual displacement data and actual plastic strain through the image captured by the DIC high-speed camera.

[0082] In addition, it can also be a combination of the above two methods, that is, part of the operation of step S75 is performed during the execution of step S74, and the remaining part of the operation of step S75 is performed after the execution of step S74. For example, the actual load data is collected during the execution of step S74, and the actual displacement data and the actual plastic strain are determined after the execution of step S74. The actual plastic strain includes the maximum plastic strain of the test sample plate 107 at the first moment of fracture.

[0083] During the static collision of the punch 106 with the test sample plate 107, the magnitude relationship between the actual load data and the preset threshold is determined, and the static collision process is terminated when the actual load data is less than or equal to the preset threshold. For example, the preset threshold may be 20% of the maximum load, that is, when obvious cracks appear at the bend of the test sample plate 107 and the load is reduced to less than 20% of the maximum load, the test is stopped.

[0084] For the test sample plate 107 of the same material type, the above steps S71 to S75 can be repeated three or more times, and the actual load data, actual displacement data and actual plastic strain in the test process can be determined according to the three or more test results and the relevant sample value selection method.

[0085] According to the actual load data and actual displacement data during the static collision of the punch 106 with the test sample plate 107, the following is drawn: Figure 8 The load-displacement curve (also called force-displacement curve) shown in FIG. 1 is a load-displacement curve. In addition, the image taken by the DIC high-speed camera can be processed using relevant software to obtain the plastic strain corresponding to the sample plate 107 to be tested.

[0086] like Fig. 9 As shown, a collision test simulation method provided by the present application is implemented based on the static collision process of a collision test method provided above, and the simulation method includes steps S91 to S95.

[0087] Step S91, constructing a plurality of sample simulation models with different grid sizes according to the sample plate 107 to be tested;

[0088] Step S92, constructing a punch simulation model according to the punch 106;

[0089] Step S93, simulating a static collision process using each sample simulation model and the punch simulation model, and determining a simulated plastic strain in the simulated collision process corresponding to each sample simulation model;

[0090] Step S94, determining the correlation between the mesh size and the fracture strain correlation coefficient according to the simulated plastic strain of the multiple specimen simulation models.

[0091] When executing step S91, the types of different grids can be set according to the needs. For example, the grids can include specifications such as 0.5mm, 1mm, 1.5mm, 2.0mm, 3.0mm, 4.0mm, 6.0mm, 8.0mm, 10.0mm, etc. A sample simulation model is constructed for each specification of the grid. The size parameters, material parameters and other parameters of the sample simulation model are the same as the parameters of the sample plate 107 to be tested involved in the collision test method provided above. In other words, when the grid specifications include 0.5mm, 1mm, 1.5mm, 2.0mm, 3.0mm, 4.0mm, 6.0mm, 8.0mm, and 10.0mm, then it is necessary to construct 9 kinds of sample simulation models corresponding to the above-mentioned grid specifications. Except for the different grid specifications, the other parameters of these 9 sample simulation models are the same. The sample simulation model can select a static test hardening model.

[0092] When executing step S92 , a punch simulation model may be constructed according to the size parameters, material parameters, etc. of the punch 106 .

[0093] Step S91 and step S92 may be implemented simultaneously, or step S91 may be implemented first and then step S92. Of course, step S92 may be implemented first and then step S91.

[0094] When executing step S93, for each sample simulation model obtained in step S91, the static collision process in the aforementioned collision test method is simulated with the punch simulation model obtained in step S92. Simulating the static collision process means performing a simulation according to the same collision conditions as in the aforementioned collision test method. The collision conditions may include the acceleration of the punch 106, the relative position relationship between the punch 106 and the sample plate 107 to be tested, the interaction relationship between the collision test equipment and the sample plate 107 to be tested, the conditions for stopping the collision, etc.

[0095] In the process of simulating static collision, the simulated load data, simulated displacement data and simulated plastic strain of each specimen simulation model in the process of simulating collision are output.

[0096] Based on the simulated load data, it can be determined whether the simulated static collision process of each sample simulation model is effective, which can be specifically implemented according to the following formula 2.

[0097]

[0098] Among them, F imax is the maximum simulated load of the ith specimen simulation model, F max It is the maximum actual load of the test sample plate 107 during the collision process in the aforementioned collision test method.

[0099] That is, if the ratio of the maximum simulated load of the ith sample simulation model to the maximum actual load of the to-be-tested sample plate 107 during the collision is greater than or equal to 0.98, the simulation process of the ith sample simulation model is considered to be valid. If the simulation process of the ith sample simulation model is invalid, the relevant parameters of the ith sample simulation model (here, the relevant parameters do not include the grid size) can be adjusted, and step S93 is continued to be performed for the adjusted ith sample simulation model until the simulation process of the ith sample simulation model is valid.

[0100] For all valid specimen simulation models of the simulation process, the corresponding simulated plastic strain is determined, and the simulated plastic strain can be directly output by the simulation software.

[0101] Continuing to execute step S94, the simulated plastic strains corresponding to all the sample simulation models are processed according to formulas 3 to 5, and then the fracture strain correlation coefficient can be obtained, and then the correlation relationship between the grid size and the fracture strain correlation coefficient can be obtained.

[0102]

[0103] in, is the mean value of the fracture strain correlation coefficient of all specimen simulation models, ε imax is the maximum fracture strain correlation coefficient of the i-th specimen simulation model, i is the number of specimen simulation models, ε′ imax is the normalized fracture strain correlation coefficient of the simulation model of the i-th specimen.

[0104] After step S94 is executed, the mesh effect curve of the collision model can be fitted by taking the mesh size as the horizontal axis and the fracture strain correlation coefficient as the vertical axis, such as Fig.10 The grid effect curve together with the material collision model is embedded in the material card of the test sample plate 107, which can provide a basis for selecting a suitable simulation grid size for the material type corresponding to the test sample plate 107, thereby improving the accuracy of the material simulation model process and improving the accuracy and reliability of the collision analysis.

[0105] A collision test simulation method provided in this embodiment can determine the relationship between the fracture strain correlation coefficient and the grid size, and then provide a basis for selecting the grid size of the simulation model for the corresponding material, thereby reducing the inability to accurately describe the entire necking and fracture process due to a small number of grids, and reducing the gap between the simulation process and the actual test process; in addition, it can also provide a basis for selecting the grid size for the simulation model of ultra-high strength materials, increase the tensile displacement in the simulation process, and improve the accuracy of the simulation analysis.

[0106] The test equipment, test method, and simulation method provided in this embodiment effectively increase the selection of grid size for the sample plate, and can efficiently obtain the force-displacement variation curve and the maximum plastic strain at failure during the entire test process, providing benchmark data for effective grid simulation. The reliability of the simulation analysis is verified through maximum force error analysis, and the corresponding maximum plastic strain is extracted based on this; the grid effect coefficient is obtained through normalization processing, and the grid effect curve is obtained by fitting. The present invention can effectively replace the existing uniaxial tensile simulation method, meet the accuracy requirements of the grid effect analysis of the enhanced plasticity high-strength steel collision model, effectively improve the accuracy of the large grid size analysis results, obtain a more accurate grid effect curve, and improve the accuracy of the collision simulation analysis.

[0107] The most commonly used method for grid effect analysis is to use A80, A50 or other uniaxial tensile specimens, establish simulation models with grid sizes of 0.5mm, 1mm, 2.5mm, 5mm, 10mm, etc., perform quasi-static tensile test simulation, and obtain the force-displacement curve of the entire process; extract the deformation corresponding to the test fracture point, obtain the equivalent plastic strain of different grid models under the fracture deformation, and use the result with a grid size of 0.5mm as the benchmark value to perform normalization coefficient processing on the fracture strain of different grid models to obtain the fracture strain correlation coefficient of different grid sizes, and then fit to obtain the grid effect curve, which replaces the existing uniaxial tensile simulation method, meets the accuracy requirements of grid effect analysis of enhanced plasticity high-strength steel collision model, effectively improves the accuracy of large grid size analysis results, obtains more accurate grid effect curves, and improves the accuracy of collision simulation analysis.

[0108] Since the electronic device introduced in this embodiment is an electronic device used to implement the information processing method in the embodiment of the present application, based on the information processing method introduced in the embodiment of the present application, a person skilled in the art can understand the specific implementation of the electronic device of the present embodiment and its various variations, so how the electronic device implements the method in the embodiment of the present application is not described in detail here. As long as a person skilled in the art implements the electronic device used by the information processing method in the embodiment of the present application, it belongs to the scope of protection of this application.

[0109] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0110] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0111] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0112] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0113] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0114] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A collision test device, characterized in that: Including fixed base and slide rail block; The middle part of the fixed base and the middle part of the slide rail block are both hollow; The cavity in the middle of the slide rail block overlaps with the cavity of the fixed base, and the frames at both ends of the slide rail block are movably bridged to the frames of the fixed base through base fasteners; The collision test device is used to detach the base fasteners during the collision test to separate the fixed base and the slide rail block, place the sample plate to be tested between the fixed base and the slide rail block, and then movably fix the fixed base and the slide rail block through the base fasteners, so that the sample plate to be tested is statically collided by the punch while being fixedly clamped by the fixed base and the slide rail block.

2. A collision test device as claimed in claim 1, characterized in that: The device also includes two support rollers; both ends of each support roller are placed in the cavity in the middle of the slide rail block and are bridged to the frame of the slide rail block.

3. A collision test device as claimed in claim 2, characterized in that: A slide groove is arranged on the frame of the slide rail block, and locking components are arranged at both ends of each support roller. Each support roller is movably connected to the slide groove on the frame of the slide rail block through the locking components at both ends.

4. A collision test device as claimed in claim 3, characterized in that: The frame of the slide rail block provided with the slide groove is provided with a ruler and a middle position marker.

5. A collision test device as claimed in claim 1, characterized in that: A groove is arranged on the frame of the fixed base, and the frames at both ends of the slide rail block are bridged into the groove on the frame of the fixed base.

6. A collision test method, characterized in that: Applied to a collision test device as claimed in any one of claims 1 to 5, the method comprising: Disassemble the base fastener to separate the fixed base from the slide rail block; place the sample plate to be tested between the fixed base and the slide rail block; The fixed base and the slide rail block are movably fixed by the base fastener, so that the fixed base and the slide rail block clamp the sample plate to be tested; When the sample plate to be tested is fixedly clamped by the fixed base and the slide rail block, the punch is controlled to statically collide with the sample plate to be tested from a direction perpendicular to the plane where the sample plate to be tested is located; The actual load data, actual displacement data and actual plastic strain of the plate sample to be tested during the static collision process are detected, and the test result of the plate sample to be tested is determined according to the actual load data, the actual displacement data and the actual plastic strain.

7. A collision test method as claimed in claim 6, characterized in that: When the punch performs static collision on the sample plate to be tested, the blade direction of the punch is perpendicular to the long axis direction of the sample plate to be tested, and the blade direction of the punch coincides with the short axis of the cavity in the middle of the slide rail block.

8. A collision test method as claimed in claim 6, characterized in that: If the collision test equipment is provided with two supporting rollers, when the sample plate to be tested is fixedly clamped by the fixed base and the slide rail block, the distance between the two supporting rollers is adjusted to a preset distance, and the preset distance is determined according to the radius of the two supporting rollers and the yield strength and tensile strength of the sample plate to be tested.

9. A collision test method as claimed in claim 6, characterized in that: During the process in which the punch performs a static collision on the sample plate to be tested, the method further comprises: When the actual load data is less than or equal to a preset threshold, the static collision process is terminated.

10. A collision test simulation method, characterized in that: Based on the static collision process of a collision test method according to any one of claims 6 to 9, the simulation method comprises: According to the test sample plate, a plurality of sample simulation models with different grid sizes are constructed; According to the punch, a punch simulation model is constructed; Simulating the static collision process using each sample simulation model and the punch simulation model, and determining the simulated plastic strain in the simulated collision process corresponding to each sample simulation model; According to the simulated plastic strain of multiple specimen simulation models, the correlation between the mesh size and the fracture strain correlation coefficient is determined.

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