Simulation analysis method and device for horizontal pulling strength of plane connector

Abstract

The invention provides a simulation analysis method and device for horizontal pulling strength of a plane connector, and the method comprises the steps: cutting out a part of the plane connector in a buckling state as an analysis model, and carrying out the modeling processing of inner teeth, outer teeth and base cloth of the analysis model; setting contact parameters and material parameters of each part of the analysis model; setting a coordinate system of the analysis model; selecting a loading point and a constraint point of the analysis model, adding a corresponding constraint to the constraint point, and applying a horizontal pulling strong load to the loading point so as to perform simulation calculation; the simulation output result of the analysis model is analyzed, and the horizontal pulling strength load of the plane connector is determined; measuring the inner tooth and the outer tooth which are closest to the loading point or the constraint point, cutting out a section in the middle position of the tooth width of the position, judging by taking a Z-direction distance value between the lowest point of the tooth root of the inner tooth and the highest point of the buckling area of the outer tooth, and if the distance between the two is reduced from an initial value to 0, determining the tensile constraint reaction force at the moment as the horizontal tensile strength load.

Description

Technical Field

[0001] The present invention relates to the technical field of planar coupling parts, and in particular to a method and a device for simulating and analyzing the horizontal pulling strength of a planar coupling part. Background Art

[0002] As a specially designed part, the plane joint is mainly used to achieve gas sealing effect and is widely used in the defense, military and civilian fields. Because it can effectively prevent gas penetration, it plays an indispensable role in occasions that require sealing protection. However, due to the relatively small market demand, this technical field has not received extensive research attention.

[0003] Although planar joints play an irreplaceable role in specific fields, their design and testing processes have obvious defects. At present, the design of planar joints mainly relies on the production and testing of physical samples. This method cannot evaluate and optimize the performance of planar joints in the early stage of design. In addition, due to the small size of the planar joint structure, it is difficult to conduct comprehensive and real-time accurate measurement of all strength states (such as stress, strain, etc.) of the planar joint in actual tests, resulting in inefficient design optimization process, long cycle and high cost. Summary of the invention

[0004] The present invention provides a method and device for simulating and analyzing the flat pulling strength of a planar joint, which are used to solve the defects of low efficiency, long cycle and high cost in the design optimization process in the prior art.

[0005] The present invention provides a method for simulating and analyzing the flat pulling strength of a planar coupling, characterized in that the planar coupling comprises inner teeth, outer teeth and a base fabric, and the base fabric is located between the inner teeth and the outer teeth; The method comprises: Cutting off a portion of the planar combination in a fastened state as an analysis model, and modeling the inner teeth, the outer teeth and the base fabric of the analysis model respectively; Setting contact parameters and material parameters of various parts of the analysis model; Setting the coordinate system of the analysis model; taking the length direction of the planar combination as the X direction of the analysis model, taking the direction of applying the horizontal tensile force as the Y direction, and taking the direction perpendicular to the X direction and the Y direction as the Z direction; Selecting the loading points and constraint points of the analysis model, adding corresponding constraints to the constraint points, and applying a horizontal tensile strong load to the loading points to perform simulation calculations; The simulation output results of the analysis model are analyzed to determine the horizontal tensile strength load of the planar coupling; wherein, the inner teeth and outer teeth closest to the loading point or the constraint point are measured, a cross section is cut at the middle of the tooth width at this position, and the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area is taken for judgment. If the distance between the two is reduced from the initial value to 0, it is defined as the inner tooth disengagement, and the tensile constraint reaction force of the analysis model at this time is determined as the horizontal tensile strength load.

[0006] According to the flat tensile strength simulation analysis method of a planar coupling provided by the present invention, the inner teeth, outer teeth and base fabric of the analysis model are modeled respectively, specifically comprising: performing finite element meshing on the inner teeth of the analysis model to obtain a finite element model of the inner teeth; performing finite element meshing on the outer teeth of the analysis model to obtain a finite element model of the outer teeth; performing meshing on the base fabric sealing surface in an interference state, and performing meshing on the base fabric at other positions in an actual size state to obtain a finite element model of the base fabric, wherein the interference state is 5% to 30% of the average size of the mesh interpenetration units of the base fabric sealing surface.

[0007] According to the flat pull strength simulation analysis method of the planar joint provided by the present invention, the contact parameters of each part of the analysis model are set, specifically including: Setting contact parameters between the inner teeth and the base fabric, between the inner teeth and the inner teeth, and between the sealing surfaces of the base fabric, wherein the inner teeth and the base fabric are set to be in normal contact, the meshing area between the inner teeth and the inner teeth is set to be in normal contact, and the sealing surfaces of the base fabrics are set to be in interference contact; micro spring units are respectively set between the inner teeth and the base fabric, between the inner teeth and the inner teeth, and between the sealing surfaces of the base fabrics, wherein the micro spring units are used to simulate the physical contact state changes of the real contact area; The material parameters of each part of the analysis model are set, specifically including: for the metal materials corresponding to the inner teeth and the outer teeth, a nonlinear plastic material is created according to the test stress-strain curve; for the part of the base cloth located outside the outer teeth, a linear elastic material is set according to the elastic modulus parameter of the base cloth; for the base cloth located within the wrapping clamping range of the outer teeth, a nonlinear plastic material is set according to the material stress-strain curve.

[0008] According to the horizontal pulling strength simulation analysis method of the planar joint provided by the present invention, the loading points and constraint points of the analysis model are selected, specifically including: The intersection of the truncation plane located in the middle of the analysis model and the center line of the base fabric thickness is selected as the loading point and the constraint point; wherein the loading point is located in the positive Y direction, and the constraint point is located in the negative Y direction; The loading point is taken as the main point, and the nodes on both sides of the truncation plane within a set range from the loading point are taken as the secondary points, and the rigid rod units of the base fabric on both sides of the loading point are established.

[0009] According to the horizontal pulling strength simulation analysis method of the planar joint provided by the present invention, corresponding constraints are added to the constraint points, and horizontal pulling strength loads are applied to the loading points, specifically including: Add translational freedom constraints in the X, Y, and Z directions and rotational freedom constraints around the X, Y, and Z axes to the constraint points; Apply a strong horizontal tensile load along the positive Y direction to the loading point.

[0010] According to the flat tensile strength simulation analysis method of the planar joint provided by the present invention, before performing the simulation calculation, the method further includes: Set up contact analysis control cards, where contact analysis includes large geometric deformation nonlinear analysis and material nonlinear analysis to ensure the accuracy of the simulation process; Set the discontinuous calculation control card and contact stability control card for each load step to ensure the stability of the simulation process.

[0011] According to the horizontal pulling strength simulation analysis method of the planar joint provided by the present invention, the simulation output result of the analysis model is analyzed, specifically including: For each node in the analysis model, output node displacement, constraint reaction force and concentrated force; For rigid bar elements, output stress distribution and strain distribution; For contact pairs, contact stress and contact displacement are output.

[0012] The present invention also provides a device for simulating and analyzing the flat pulling strength of a planar joint, wherein the planar joint comprises inner teeth, outer teeth and a base fabric, wherein the base fabric is located between the inner teeth and the outer teeth; the device comprises: A modeling processing module, used to intercept a portion of the planar combination in a fastened state as an analysis model, and to perform modeling processing on the inner teeth, outer teeth and base fabric of the analysis model respectively; A parameter setting module, used to set contact parameters and material parameters of various parts of the analysis model; A coordinate system setting module, used to set the coordinate system of the analysis model; the length direction of the plane combination is the X direction of the analysis model, the direction of applying the horizontal pulling force is the Y direction, and the direction perpendicular to the X direction and the Y direction is the Z direction; A constraint load setting module is used to select the loading point and constraint point of the analysis model, add corresponding constraints to the constraint point, and apply a horizontal tensile strong load to the loading point to perform simulation calculation; The output result analysis module is used to analyze the simulation output results of the analysis model to determine the horizontal tensile strength load of the planar coupling; wherein, the inner teeth and outer teeth closest to the loading point or the constraint point are measured, a cross section is cut at the middle of the tooth width at this position, and the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area is taken for judgment. If the distance between the two is reduced from the initial value to 0, it is defined as the inner tooth disengagement, and the tensile constraint reaction force of the analysis model at this time is determined as the horizontal tensile strength load.

[0013] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for simulating and analyzing the flat pulling strength of a planar coupling as described above is implemented.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for simulating and analyzing the flat pulling strength of a planar coupling as described in any one of the above-mentioned methods is implemented.

[0015] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the method for simulating and analyzing the flat pulling strength of a planar coupling member as described in any one of the above-mentioned methods is implemented.

[0016] The method and device for simulating and analyzing the horizontal tensile strength of a planar joint provided by the present invention can evaluate and optimize the performance of the planar joint in the early stage of design by establishing an analysis model of the planar joint and simulating and analyzing the horizontal tensile strength of the planar joint, thereby avoiding the low efficiency of relying on the production and testing of physical samples in traditional methods; and the simulation analysis can comprehensively and real-time measure the strength state of the planar joint, such as stress, strain, etc., at the microscopic level, providing more accurate data support for design optimization, and realizing high-efficiency, low-cost, and accurate performance prediction and optimization in the design process of the planar joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the planar coupling member provided by the present invention.

[0019] Figure 2 It is a schematic diagram of the flat pull strength test of the airtight zipper provided by the present invention.

[0020] Figure 3 It is one of the flow diagrams of the flat pulling strength simulation analysis method of the planar joint provided by the present invention.

[0021] Figure 4 This is the second flow chart of the flat pulling strength simulation analysis method of the planar joint provided by the present invention.

[0022] Figure 5 It is a schematic diagram of the non-structural fillet processing of the external teeth provided by the present invention.

[0023] Figure 6a and Figure 6b It is a schematic diagram of the finite element mesh division of the external teeth and the internal teeth provided by the present invention.

[0024] Figure 7 It is a schematic diagram of finite element mesh division of the base fabric provided by the present invention.

[0025] Figure 8 It is a schematic diagram of material property settings of various parts of the airtight zipper provided by the present invention.

[0026] Fig. 9 It is a structural schematic diagram of the planar coupling grid model provided by the present invention.

[0027] Fig.10 It is a schematic diagram of the positions of the loading points and the restraining points of the planar coupling member provided by the present invention.

[0028] Fig.11 It is a schematic diagram of setting model constraints provided by the present invention.

[0029] Fig.12 It is a schematic diagram of load loading of the model provided by the present invention.

[0030] Figure 13a~Figure 1 3c is a schematic diagram of the method for determining the horizontal pulling force load provided by the present invention.

[0031] Fig.14 It is a schematic diagram of the Z-direction spacing and model constraint reaction force provided by the present invention.

[0032] Fig.15 It is a structural schematic diagram of the flat pulling strength simulation analysis device of the planar joint provided by the present invention.

[0033] Fig.16 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] First, the terms involved in the embodiments of the present invention are schematically explained.

[0036] Airtight zipper: refers to a zipper that adopts a special zipper structure design and can achieve a gas-tight effect in terms of performance. The airtight zipper described in the embodiment of the present invention is an inner and outer tooth sealing structure, the inner teeth realize the zipper meshing function, and the outer teeth realize the sealing function of pressing the base fabric joint surface.

[0037] Flat pull strength: refers to the ultimate load determined when a flat joint structure of a certain length is damaged by a flat pull test perpendicular to the length direction of the flat joint structure according to the requirements of the "QB / T2171 Zipper Standard".

[0038] Base cloth: refers to the base cloth to which the plane connecting piece is attached and connected. In the embodiment of the present invention, in order to achieve the sealing effect, the base cloth is made of a fiber cloth with TPU material coated on the surface. In the plane connecting piece involved in the embodiment of the present invention, the base cloth is sandwiched between the outer teeth and the inner teeth at the chain tooth position, and pressure is applied to the base cloth by the outer teeth, so that the base cloths opposite to the plane connecting piece are tightly pressed together, thereby achieving the function of sealing the connecting surface of the plane connecting piece.

[0039] Inner teeth: refers to the chain tooth structure in the planar coupling part used to achieve the meshing of the planar coupling part. The shape of the inner teeth involved in the embodiment of the present invention is roughly an "I" shape, in which the "I" part of the tooth root is wrapped by the base cloth and then wrapped and clamped by the outer teeth, and the "I" part of the tooth tip is the part where the inner teeth mesh with each other.

[0040] External teeth: refers to the chain tooth structure used to compress the base cloth in the planar coupling to achieve sealing. The external teeth involved in the embodiment of the present invention are roughly in the shape of a "C". The "I"-shaped root of the inner teeth is wrapped by the base cloth and embedded in the "C"-shaped inner cavity of the outer teeth to achieve a fixed connection between the inner and outer teeth. After the inner teeth are engaged, the outer teeth are pulled toward the opposite outer teeth by the inner teeth. A pair of external teeth form two opposing "C" letters, and the base cloth is clamped by the upper and lower lips of the "C" letter to achieve the sealing function of the coupling surface of the planar coupling.

[0041] Finite Element Method: Finite Element Method (FEM) is a mathematical method for solving engineering problems. Its basic idea is to divide the computational domain into a finite number of non-overlapping units, select some appropriate nodes as interpolation points of the solution function in each unit, rewrite the variables in the differential equation into a linear expression composed of the node values ​​of each variable or its derivative and the selected interpolation function, and use the variational principle or weighted residual method to discretely solve the differential equation.

[0042] In the embodiment of the present invention, the structure of the planar coupling member is shown as follows: Figure 1 In this embodiment, the plane coupling member 10 is an airtight zipper as an example, which includes inner teeth 101 , outer teeth 102 and a base fabric 103 , wherein the base fabric 103 is located between the inner teeth 101 and the outer teeth 102 .

[0043] The design of airtight zippers needs to meet certain horizontal pull strength requirements. According to the "QB / T2171 Zipper Standard", the horizontal pull strength test cuts a 75mm long zipper in the closed state, uses a 25mm wide clamp to clamp the base fabrics on both sides, and uses a tensile testing machine to stretch the base fabrics on both sides. The test is carried out until the chain teeth are stripped or the base fabric is damaged. The tensile load displayed at this time is the horizontal pull strength value. The test diagram is as follows Figure 2 Therefore, it is necessary to propose an analysis method that can better simulate the flat pull strength test process for planar joints. In the early stage of planar joint design, the flat pull strength performance of the planar joint can be calculated through numerical simulation to evaluate whether it meets the performance requirements.

[0044] To achieve this, the embodiment of the present invention proposes a method for simulating and analyzing the flat pull strength of a planar joint, and uses the finite element method to implement simulation analysis and evaluation of the flat pull strength of a planar joint. Figure 3 As shown, the method includes the following: 301. Cut off a portion of the planar combination in a fastened state as an analysis model, and perform modeling processing on the inner teeth, outer teeth and base fabric of the analysis model respectively.

[0045] In this embodiment, according to the design data of the plane joint part and the test condition requirements in the "QB / T2171 Plane Joint Part Standard", a 75 mm long portion of the plane joint part in the fastened state of the finished plane joint part is cut out as an analysis model.

[0046] Cut a 75mm length of the fastened state section from the finished flat joint to ensure that it contains the complete internal teeth, external teeth and base fabric structure. Use high-precision scanning or measuring equipment to obtain detailed geometric data to ensure the accuracy of the model. Digitally model the cut section to generate the corresponding model.

[0047] 302. Set contact parameters and material parameters of each part of the analysis model.

[0048] Finite element meshing is performed on the inner teeth, outer teeth and base fabric. For the inner and outer teeth of metal materials, a nonlinear plastic material model is set according to the stress-strain curve obtained from the experiment. For the base fabric, a linear elastic material is set according to its elastic modulus; for the base fabric within the clamping range of the outer teeth, a nonlinear plastic material is set. When setting the contact parameters, the interaction between the inner teeth and the base fabric, the inner teeth and the inner teeth, and the sealing surface of the base fabric are taken into consideration, and they are set to normal contact and interference contact respectively, and appropriate friction coefficients and contact stiffness are set for these contact pairs.

[0049] 303. Set the coordinate system of the analysis model; take the length direction of the planar coupling member as the X direction of the analysis model, take the direction of applying the horizontal pulling force as the Y direction, and take the direction perpendicular to the X direction and the Y direction as the Z direction.

[0050] On the truncation plane in the middle of the analysis model, the intersection with the center line of the base fabric thickness is selected as the loading point and constraint point. The loading point is located in the positive Y direction, and the constraint point is located in the negative Y direction. Rigid rod units are established on the base fabric on both sides of the loading point to simulate the actual loading and constraint conditions. Add translational freedom constraints in the three directions of X, Y, and Z and rotational freedom constraints around the X, Y, and Z axes to the constraint point; apply a strong horizontal tensile load along the positive Y direction to the loading point.

[0051] 304. Select the loading points and constraint points of the analysis model, add corresponding constraints to the constraint points, and apply a horizontal tensile strong load to the loading points to perform simulation calculations.

[0052] On the truncation plane at the middle position of the analysis model, the intersection with the center line of the base fabric thickness is selected as the loading point and the constraint point. The loading point is located in the positive direction of Y, and the constraint point is located in the negative direction of Y. The loading point is taken as the main point, and the nodes on both sides of the truncation plane within the set range of the loading point are taken as the slave points. The rigid rod units of the base fabric on both sides of the loading point are established to simulate the actual loading and constraint conditions.

[0053] Add translational freedom constraints in the X, Y, and Z directions and rotational freedom constraints around the X, Y, and Z axes to the constraint points; apply a strong horizontal tensile load along the positive Y direction to the loading point.

[0054] Before performing simulation calculations, the method also includes: setting a contact analysis control card, wherein the contact analysis includes large geometric deformation nonlinear analysis and material nonlinear analysis to ensure the accuracy of the simulation process; setting a discontinuous calculation control card and a contact stability control card for each load step to ensure the stability of the simulation process.

[0055] Among them, geometric large deformation nonlinearity: This means that during the stress process, the deformation of the material or structure may be so large that the effect of the deformation on the stress distribution cannot be ignored. In the flat tensile strength analysis of a planar joint, the chain teeth and base fabric of the planar joint may experience significant deformation.

[0056] Material nonlinearity: The stress-strain relationship of the material is not linear and may exhibit elasticity, plasticity, creep, etc. In the analysis of planar joints, the materials of the sprocket and base fabric may exhibit nonlinear stress-strain behavior.

[0057] In finite element analysis, a load step is a stage in the analysis process used to gradually apply loads and calculate the structural response. The concept of a load step allows analysts to simulate the process of gradually increasing loads, which is very useful when simulating gradually changing load conditions in actual working conditions. Load steps are usually associated with time, and each load step can represent a specific period of time during which the applied load is constant or changes according to a certain law.

[0058] In nonlinear analysis, such as geometric nonlinearity or material nonlinearity, the load is often not applied all at once, but is gradually increased through multiple load steps, with each load step applying a portion of the load. This can avoid numerical problems caused by rapid changes in load.

[0059] Specifically, the Discontinuity Calculation Control card is used to handle possible discontinuities in the model, such as contact separation or material yielding, etc. The Contact Stability Control card is used to improve the stability of the contact algorithm, especially in cases where large changes in the contact area may occur.

[0060] 305. Analyze the simulation output results of the analysis model to determine the horizontal tensile strength load of the planar coupling; wherein, the inner teeth and outer teeth closest to the loading point or the constraint point are measured, a cross section is cut at the middle of the tooth width at this position, and the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area is taken for judgment. If the distance between the two is reduced from the initial value to 0, it is defined as the inner tooth disengagement, and the tensile constraint reaction force of the analysis model at this time is determined as the horizontal tensile strength load.

[0061] The simulation output results of the analysis model are analyzed, specifically including: for each node in the analysis model, outputting node displacement, constraint reaction force and concentrated force; for rigid rod units, outputting stress distribution and strain distribution; for contact pairs, outputting contact stress and contact displacement.

[0062] After the simulation calculation, the simulation output results are collected and analyzed. The output results include the displacement, constraint reaction force and concentrated force of each node, the stress distribution and strain distribution of the rigid rod unit, and the contact stress and contact displacement of the contact pair. Pay special attention to the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area. When this distance is reduced from the initial value to 0, the tensile constraint reaction force at this time is recorded as the horizontal tensile force load. In addition, the relationship curve between the Z-direction spacing and the model constraint reaction force is drawn to intuitively show the performance changes of the planar joint during the force process.

[0063] The horizontal tensile strength simulation analysis method of a planar joint provided in an embodiment of the present invention, by establishing an analysis model of the planar joint and performing simulation analysis on the horizontal tensile strength of the planar joint, can evaluate and optimize the performance of the planar joint in the early stage of design, thereby avoiding the low efficiency of relying on the production and testing of physical samples in traditional methods; and the simulation analysis can comprehensively and real-time measure the strength state of the planar joint, such as stress, strain, etc., at the microscopic level, providing more accurate data support for design optimization, and realizing high-efficiency, low-cost, and accurate performance prediction and optimization in the design process of the planar joint.

[0064] Further, see Figure 4 , respectively modeling the inner teeth, outer teeth and base fabric of the analysis model, specifically including: 401. Perform finite element meshing on the internal teeth of the analysis model to obtain a finite element model of the internal teeth.

[0065] 402. Perform finite element meshing on the external teeth of the analysis model to obtain a finite element model of the external teeth.

[0066] Remove the non-structural fillets at the edge of the cross section in the chain tooth structure that do not affect the force. In addition, retain all the fillet features of the outer contour of the tooth section. The schematic diagram of the non-structural fillet processing of the external tooth is as follows Figure 5 shown.

[0067] The adjusted analysis model is meshed by finite element. The analysis model is modeled with hexahedron and triangular prism solid units. When the chain teeth are symmetrical in the tooth width direction or the closing direction, the mesh is divided in a symmetrical manner. When the chain teeth have two symmetry axes, the model is divided into 1 / 4 and symmetrical processing is performed. The schematic diagrams of the finite element mesh division of the external teeth and the internal teeth are shown in the figure below. Figure 6a and Figure 6b shown.

[0068] 403. Mesh the base fabric located on the base fabric sealing surface in an interference state, and mesh the base fabric at other positions according to the actual size state, to obtain a finite element model of the base fabric, wherein the interference state is 5% to 30% of the average size of the mesh interpenetration units on the base fabric sealing surface.

[0069] Among them, the base fabric between the inner teeth and the outer teeth is actually first wrapped by the base fabric with the inner teeth, and then squeezed and clamped by the inner cavity of the outer teeth that is not completely closed, so as to realize the squeezing and fixing of the inner and outer teeth on the base fabric. Therefore, in addition to the uneven thickness of the base fabric between the inner and outer teeth, it is also subjected to a strong squeezing force from the outer teeth. If the above-mentioned process is simulated throughout the process, the calculation workload will be greatly increased, and the stability and convergence of the model will be reduced. In order to simplify the model, the present invention proposes a simplified modeling method in which the gap between the inner and outer teeth of the plane combination in the finished state is used as the geometric boundary of the base fabric, and at the same time, a common node method is used to connect the outer teeth and the base fabric in the contact area where the gap between the outer teeth and the base fabric is less than a certain value. In addition to the above-mentioned common node area, other parts such as the outer teeth and the base fabric, the inner teeth and the base fabric establish contact relationships according to the actual state. For the base fabric between the sealing surfaces of the outer teeth, a certain interference contact is considered to simulate the sealing and pressing effect. When establishing the grid, the sealing surface of the base fabric is established with an interference state grid of 5% to 30% of the average unit size (the sealing surface grid penetrates 5% to 30% of the average unit size) of the average unit size. The geometric features of the base fabric at other locations are modeled according to the actual size state. The schematic diagram of the finite element mesh division of the base fabric is shown in Figure 7 shown.

[0070] Specifically, setting the contact parameters of each part of the analysis model in step 302 specifically includes: setting the contact parameters between the inner teeth and the base cloth, between the inner teeth and the inner teeth, and the sealing surface of the base cloth, wherein the inner teeth and the base cloth are set to be in normal contact, the meshing area between the inner teeth and the inner teeth is set to be in normal contact, and the sealing surfaces of the base cloth are set to be in interference contact; micro-spring units are respectively set between the inner teeth and the base cloth, between the inner teeth and the inner teeth, and between the sealing surfaces of the base cloth, wherein the micro-spring units are used to simulate the physical contact state changes in the real contact area.

[0071] Specifically, normal contact is set between the inner teeth and the base fabric, and the contact surface friction coefficient is 0.1~0.6; normal contact is set between the inner teeth and the inner teeth meshing area, and the contact surface friction coefficient is 0.05~0.35. Interference contact is set on the base fabric sealing contact surface, and the interference amount is 5%~30% of the average unit size. The contact type is face-to-face small slip contact, and the contact surface friction coefficient is 0.05~0.35. Except for interference contact, the above contacts all need to set contact adjustment tolerances.

[0072] The purpose of setting up microspring units is to provide additional constraints when the contact state changes, such as during force and deformation, to avoid sudden changes in the local state of the model and calculation singularities, thereby improving the convergence of the analysis model. These microspring units can significantly improve the stability and calculation efficiency of the model without affecting the calculation results. In actual simulation analysis, the setting of microspring units needs to be determined based on the specific characteristics and simulation requirements between the contact pairs to ensure the accuracy and reliability of the simulation analysis.

[0073] Specifically, setting the material parameters of each part of the analysis model in step 302 specifically includes: for the metal materials corresponding to the inner teeth and the outer teeth, creating a nonlinear plastic material according to the test stress-strain curve; for the part of the base cloth located outside the outer teeth, setting the linear elastic material according to the elastic modulus parameters of the base cloth; for the base cloth located within the wrapping clamping range of the outer teeth, setting the nonlinear plastic material according to the material stress-strain curve.

[0074] For the chain tooth metal material, create a nonlinear plastic material based on the test stress-strain curve. For the base fabric material, the material setting needs to be divided into two parts. The base fabric material is generally orthotropic, and is simplified to isotropic material in the calculation model. The material parameters are the material elastic modulus and stress-strain curve of the base fabric in the direction of the flat tensile strength test of the plane joint. The part of the base fabric outside the outer teeth is mainly used to transfer tensile loads and has no significant effect on the flat tensile strength calculation results. The linear elastic material in this area is set according to the base fabric elastic modulus parameters. For the base fabric material within the clamping range of the outer teeth, create a nonlinear plastic material based on the material stress-strain curve. The material properties of each part are set as follows. Figure 8 shown.

[0075] Specifically, in order to understand the technical solution of the embodiment of the present invention, refer to the following steps 1 to 14.

[0076] Step 1: Cut a detailed analysis model of the plane joint in the buckled state with a length of 75 mm. Remove the non-structural fillets at the edge of the cross section in the chain tooth structure that do not affect the force. In addition, retain all the fillet features of the outer contour of the tooth section, such as Figure 5 shown.

[0077] Step 2: Model the inner teeth and outer teeth of the analysis model respectively, as shown in FIG6 .

[0078] Step 3: Process the base fabric model. The base fabric located on the sealing surface of the base fabric is modeled with an interference state of 5% to 30% of the average unit size. The geometric features of the base fabric at other locations are modeled according to the actual size state, such as Figure 7 shown.

[0079] Step 4: Set the contact parameters between the inner teeth and the base fabric, between the inner teeth and the inner teeth, and between the sealing surfaces of the base fabric.

[0080] Normal contact is set between the inner teeth and the base fabric, and the contact surface friction coefficient is 0.1~0.6. Normal contact is set between the inner teeth and the inner teeth meshing area, and the contact surface friction coefficient is 0.05~0.35. Interference contact is set on the base fabric sealing contact surface, and the interference amount is 5%~30% of the average unit size. The contact type is face-to-face small slip contact, and the contact surface friction coefficient is 0.05~0.35. Except for interference contact, the above contacts all need to set contact adjustment tolerances.

[0081] Step 5: Set up the microspring unit between the contact pairs to simulate the physical contact state changes in the real contact area.

[0082] Specifically, the horizontal tensile strength analysis of planar joints involves a large number of nonlinear calculations such as geometry, contact and material nonlinearity, among which contact nonlinearity is a common and frequent factor that causes model nonconvergence. This is mainly because when the contact state of a pure contact connection model changes during the force and deformation process, local state mutations and calculation singularities may occur due to the lack of more constraints in the model, resulting in nonconvergence problems. To solve this problem, the present invention proposes to establish a micro-spring unit between all contact connectors that can constrain the relative rigid body motion of the two parts. By setting the appropriate spring unit stiffness, the convergence of the model can be significantly improved without affecting the calculation results. The established mesh model of the planar joint is as follows: Fig. 9 shown.

[0083] Step 6: Set the material parameters of each part of the model; for the chain tooth metal material, create a nonlinear plastic material according to the test stress-strain curve; for the base fabric material, the material setting needs to be divided into two parts: for the base fabric material outside the outer teeth, set the linear elastic material according to the base fabric elastic modulus parameter; for the base fabric material within the outer tooth wrapping clamping range, set the nonlinear plastic material according to the material stress-strain curve, such as Figure 8 shown.

[0084] Step 7: Establish constraint and loading units. The loading point and constraint point of the horizontal tensile strength analysis model are located on the truncated plane of half the length of the intercepted plane combination. The intersection of the plane and the center line of the base fabric thickness is taken as the loading point or constraint point. Take this point as the main point, and the nodes on both sides of the base fabric truncation surface within 12.5mm of this point as the secondary points. Establish the rigid rod units of the base fabrics on both sides respectively. The positions of the loading point and constraint point are as follows: Fig.10 The constraint point is located on the other side of the planar joint, opposite to the loading point.

[0085] Step 8: Set the model analysis coordinate system. The length direction of the plane joint is the X direction of the analysis model, the direction of applying the horizontal tensile force is the Y direction, and the direction perpendicular to the X and Y directions is the Z direction. Figure 7 shown.

[0086] Step 9: Set model constraints.

[0087] Add translational freedom constraints in the X, Y, and Z directions and rotational freedom constraints around the X, Y, and Z axes to the constraint points; apply a strong horizontal pull load along the positive Y direction to the loading point, such as Fig.11 shown.

[0088] In finite element analysis, dof (degrees of freedom) is the degree of freedom, and each degree of freedom represents the ability to move or rotate in one direction. In three-dimensional space, a point has 6 degrees of freedom, corresponding to three translation directions (X, Y, Z) and three rotation directions (rotation around the X axis, rotation around the Y axis, and rotation around the Z axis). These degrees of freedom are usually represented by numbers 1 to 6, where: dof1: translation in the X direction; dof2: translation in the Y direction; dof3: translation in the Z direction; dof4: rotation around the X axis; dof5: rotation around the Y axis; dof6: rotation around the Z axis.

[0089] For the constraint point, the degree of freedom is dof123456; for the loading point, the degree of freedom is dof1356.

[0090] Step 10: Set the contact analysis control card, where the contact analysis includes geometric large deformation nonlinear analysis and material nonlinear analysis to ensure the accuracy of the simulation process.

[0091] Set the discontinuous calculation control card and contact stability control card for each load step to ensure the stability of the simulation process.

[0092] Step 11: Set the calculation output. For nodes, set the output node displacement, constraint reaction force and concentrated force; for elements, set the output stress and strain; for contact pairs, set the output contact stress and contact displacement.

[0093] Step 12: Set the load. The horizontal tensile strength analysis uses 8mm forced displacement for loading calculation. Apply 8mm forced displacement load in the Y direction at the loading point and establish the corresponding solution load step. The load loading diagram of the model is as follows: Fig.12 shown.

[0094] Step 13: Solve and analyze to obtain the output results of each data of interest.

[0095] In the simulation analysis of the flat pull strength of planar joints, the simulation output results usually include the following aspects: Node displacement: The displacement of each node in the model after being subjected to force, including displacement in the X, Y, and Z directions.

[0096] Stress distribution: The stress state of each element in the model, including normal stress (tensile stress and compressive stress) and shear stress.

[0097] Strain distribution: The strain state of each element in the model, including normal strain and shear strain.

[0098] Contact stress: stress distribution on the contact surface, especially the stress state in the contact area between the chain tooth and the base fabric.

[0099] Contact displacement: displacement on the contact surface, including separation and slip of the contact surface.

[0100] Constraint Reaction: The reaction force generated at the constraint point due to the applied load.

[0101] Concentrated force: The magnitude and direction of the force applied concentratedly at the loading point.

[0102] Plastic strain: If the material model includes plasticity, the distribution of plastic strain is also part of the simulation output.

[0103] Energy absorption: The energy absorbed by the model during the stretching process, including elastic energy and plastic energy.

[0104] Failure mode: The failure mode that may occur in the model during the stress process, such as chain teeth disengagement, base fabric tearing, etc.

[0105] Horizontal tensile strength load: Determine the horizontal tensile strength load of the plane joint by analyzing the disengagement of the inner and outer teeth.

[0106] Load-displacement curve: The relationship between the displacement of the loading point and the restraint reaction force is used to evaluate the load-bearing capacity of planar joints.

[0107] Contact state change: The contact state between the contact pairs, such as the change of contact area, contact pressure, etc. with time or load.

[0108] Step 14: Determine the method for determining the horizontal tensile force load: measure the inner and outer teeth closest to the loading point or constraint point. Cut a section at the middle of the tooth width at this position, and take the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area for judgment. That is, when the distance between the two is reduced from the initial value to 0, it is defined as the inner tooth being out of engagement. At this time, the tensile constraint reaction force of the model is determined as the horizontal tensile force load.

[0109] Method for determining horizontal tensile strength load Figure 13a~Figure 13c As shown in the figure. Among them, the initial z-direction distance is as follows Fig.13b As shown, the z-direction distance is Fig.13c shown.

[0110] Measure the Z-direction spacing and model constraint reaction force of the above measurement points, and output the relationship curve between the two. Fig.14 As shown in the figure, it can be seen that when the horizontal pull force load is 600N, the internal teeth are disengaged.

[0111] The following is a description of a planar coupling strength simulation analysis device provided by an embodiment of the present invention. The planar coupling strength simulation analysis device described below and the planar coupling strength simulation analysis method described above can be referenced to each other.

[0112] The embodiment of the present invention provides a device for simulating and analyzing the flat pulling strength of a planar joint. Fig.15 ,include: A modeling processing module 1501 is used to intercept a portion of the planar combination in a fastened state as an analysis model, and perform modeling processing on the inner teeth, outer teeth and base fabric of the analysis model respectively; A parameter setting module 1502 is used to set contact parameters and material parameters of various parts of the analysis model; A coordinate system setting module 1503 is used to set the coordinate system of the analysis model; the length direction of the plane combination is the X direction of the analysis model, the direction of applying the horizontal tensile force is the Y direction, and the direction perpendicular to the X direction and the Y direction is the Z direction; The constraint load setting module 1504 is used to select the loading point and the constraint point of the analysis model, add corresponding constraints to the constraint point, and apply a horizontal tensile strong load to the loading point to perform simulation calculation; The output result analysis module 1505 is used to analyze the simulation output results of the analysis model to determine the horizontal tensile strength load of the planar coupling; wherein, the inner teeth and outer teeth closest to the loading point or the constraint point are measured, a cross section is cut at the middle of the tooth width at this position, and the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area is taken for judgment. If the distance between the two is reduced from the initial value to 0, it is defined as the inner tooth disengagement, and the tensile constraint reaction force of the analysis model at this time is determined as the horizontal tensile strength load.

[0113] Fig.16 An example of a physical structure diagram of an electronic device is shown in FIG. Fig.16As shown, the electronic device may include: a processor 1610, a communications interface 1620, a memory 1630 and a communication bus 1640, wherein the processor 1610, the communications interface 1620 and the memory 1630 communicate with each other through the communication bus 1640. The processor 1610 may call the logic instructions in the memory 1630 to execute a flat pull strength simulation analysis method for a planar binding member, the method comprising: intercepting a portion of the planar binding member in a snap-fit ​​state as an analysis model, and modeling the inner teeth, outer teeth and base fabric of the analysis model respectively; setting contact parameters and material parameters of each part of the analysis model; setting a coordinate system of the analysis model; taking the length direction of the planar binding member as the X direction of the analysis model, the direction of applying the flat pull strength as the Y direction, and the direction perpendicular to the X and Y directions as the Z direction; selecting the analysis model The loading point and constraint point are determined, and corresponding constraints are added to the constraint points, and a horizontal tensile strong load is applied to the loading point for simulation calculation; the simulation output results of the analysis model are analyzed to determine the horizontal tensile strong load of the planar coupling; wherein, the inner teeth and outer teeth closest to the loading point or the constraint point are measured, and a cross section is cut at the middle position of the tooth width at this position, and the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area is taken for judgment. If the distance between the two is reduced from the initial value to 0, it is defined as the inner tooth disengagement, and the tensile constraint reaction force of the analysis model at this time is determined as the horizontal tensile strong load.

[0114] In addition, the logic instructions in the above-mentioned memory 1630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0115] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the flat-pulling strength simulation analysis method of the planar bonding parts provided by the above-mentioned methods.

[0116] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the flat-pulling strength simulation analysis method of a planar coupling provided by the above-mentioned methods.

[0117] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0118] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for simulating and analyzing the horizontal tensile strength of a planar joint, characterized in that: The plane coupling element comprises inner teeth, outer teeth and a base fabric, wherein the base fabric is located between the inner teeth and the outer teeth; The method comprises: Cutting off a portion of the planar combination in a fastened state as an analysis model, and modeling the inner teeth, the outer teeth and the base fabric of the analysis model respectively; Setting contact parameters and material parameters of various parts of the analysis model; Setting the coordinate system of the analysis model; taking the length direction of the planar combination as the X direction of the analysis model, taking the direction of applying the horizontal tensile force as the Y direction, and taking the direction perpendicular to the X direction and the Y direction as the Z direction; Selecting the loading points and constraint points of the analysis model, adding corresponding constraints to the constraint points, and applying a horizontal tensile strong load to the loading points to perform simulation calculations; The simulation output results of the analysis model are analyzed to determine the horizontal tensile strength load of the planar coupling; wherein, the inner teeth and outer teeth closest to the loading point or the constraint point are measured, a cross section is cut at the middle of the tooth width at this position, and the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area is taken for judgment. If the distance between the two is reduced from the initial value to 0, it is defined as the inner tooth disengagement, and the tensile constraint reaction force of the analysis model at this time is determined as the horizontal tensile strength load.

2. The method for simulating and analyzing the horizontal pulling strength of a planar joint according to claim 1, characterized in that: Modeling the inner teeth, outer teeth and base fabric of the analysis model respectively includes: Performing finite element meshing on the internal teeth of the analysis model to obtain a finite element model of the internal teeth; Performing finite element meshing on the external teeth of the analysis model to obtain a finite element model of the external teeth; The base fabric located on the sealing surface of the base fabric is meshed in an interference state, and the base fabric at other positions is meshed according to the actual size state to obtain a finite element model of the base fabric, wherein the interference state is 5% to 30% of the average size of the mesh interpenetration units on the sealing surface of the base fabric.

3. The method for simulating and analyzing the horizontal pulling strength of a planar joint according to claim 1, characterized in that: Set the contact parameters of each part of the analysis model, including: Setting the contact parameters between the inner teeth and the base fabric, between the inner teeth and the inner teeth, and between the sealing surfaces of the base fabrics, wherein the inner teeth and the base fabrics are set to be in normal contact, the meshing area between the inner teeth and the inner teeth is set to be in normal contact, and the sealing surfaces of the base fabrics are set to be in interference contact; Micro spring units are respectively arranged between the inner teeth and the base fabric, between the inner teeth and the inner teeth, and between the sealing surfaces of the base fabrics, wherein the micro spring units are used to simulate the physical contact state changes of the real contact area; Set the material parameters of each part of the analysis model, including: For the metal materials corresponding to the internal and external teeth, nonlinear plastic materials are created according to the test stress-strain curves; For the base fabric located outside the outer teeth, a linear elastic material is set according to the elastic modulus parameter of the base fabric; for the base fabric located within the wrapping and clamping range of the outer teeth, a nonlinear plastic material is set according to the material stress-strain curve.

4. The method for simulating and analyzing the horizontal pulling strength of a planar joint according to claim 1, characterized in that: Selecting the loading points and constraint points of the analysis model specifically includes: The intersection of the truncation plane located in the middle of the analysis model and the center line of the base fabric thickness is selected as the loading point and the constraint point; wherein the loading point is located in the positive Y direction, and the constraint point is located in the negative Y direction; The loading point is taken as the main point, and the nodes on both sides of the truncation plane within a set range from the loading point are taken as the secondary points, and the rigid rod units of the base fabric on both sides of the loading point are established.

5. The method for simulating and analyzing the horizontal pulling strength of a planar joint according to claim 1, characterized in that: Add corresponding constraints to the constraint points and apply strong horizontal tensile loads to the loading points, including: Add translational freedom constraints in the X, Y, and Z directions and rotational freedom constraints around the X, Y, and Z axes to the constraint points; Apply a strong horizontal tensile load along the positive Y direction to the loading point.

6. The method for simulating and analyzing the horizontal pulling strength of a planar joint according to claim 1 or 5, characterized in that: Before performing the simulation calculation, the method further includes: Set up contact analysis control cards, where contact analysis includes large geometric deformation nonlinear analysis and material nonlinear analysis to ensure the accuracy of the simulation process; Set the discontinuous calculation control card and contact stability control card for each load step to ensure the stability of the simulation process.

7. The method for simulating and analyzing the horizontal pulling strength of a planar joint according to claim 4, characterized in that: Analyzing the simulation output results of the analysis model, specifically including: For each node in the analysis model, output node displacement, constraint reaction force and concentrated force; For rigid bar elements, output stress distribution and strain distribution; For contact pairs, contact stress and contact displacement are output.

8. A device for simulating and analyzing the flat pulling strength of a planar joint, characterized in that: The plane coupling element comprises inner teeth, outer teeth and a base fabric, wherein the base fabric is located between the inner teeth and the outer teeth; The device comprises: A modeling processing module, used to intercept a portion of the planar combination in a fastened state as an analysis model, and to perform modeling processing on the inner teeth, outer teeth and base fabric of the analysis model respectively; A parameter setting module, used to set contact parameters and material parameters of various parts of the analysis model; A coordinate system setting module, used to set the coordinate system of the analysis model; the length direction of the plane combination is the X direction of the analysis model, the direction of applying the horizontal pulling force is the Y direction, and the direction perpendicular to the X direction and the Y direction is the Z direction; A constraint load setting module is used to select the loading point and constraint point of the analysis model, add corresponding constraints to the constraint point, and apply a horizontal tensile strong load to the loading point to perform simulation calculation; The output result analysis module is used to analyze the simulation output results of the analysis model to determine the horizontal tensile strength load of the planar coupling; wherein, the inner teeth and outer teeth closest to the loading point or the constraint point are measured, a cross section is cut at the middle of the tooth width at this position, and the Z-direction distance value between the lowest point of the inner tooth root and the highest point of the outer tooth engagement area is taken for judgment. If the distance between the two is reduced from the initial value to 0, it is defined as the inner tooth disengagement, and the tensile constraint reaction force of the analysis model at this time is determined as the horizontal tensile strength load.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the horizontal pulling strength simulation analysis method of the planar coupling member as described in any one of claims 1 to 7 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for simulating and analyzing the flat tensile strength of a planar coupling as claimed in any one of claims 1 to 7 is implemented.

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