Barrier avoidance model front end face high-precision modeling method, device, equipment and medium

Abstract

The invention relates to the technical field of model construction, in particular to a barrier model front end face high-precision modeling method and device, equipment and a medium, and the method comprises the steps: recognizing a front end face structure of a barrier model; the front end face structure is modeled into a multi-layer two-dimensional shell unit, a three-dimensional unit is generated according to nodes of the multi-layer two-dimensional shell unit, and the multi-layer two-dimensional shell unit and the three-dimensional unit are coupled to obtain a finite element model; and obtaining target failure parameters of the front end surface structure material and the three-dimensional unit material in the finite element model, and establishing a front end surface model of the barrier model according to the target failure parameters and the finite element model. Therefore, the problem that the obstacle avoidance model in the prior art is low in simulation precision is solved.

Description

Technical Field

[0001] The present application relates to the field of model building technology, and in particular to a method, device, equipment and medium for high-precision modeling of the front end face of a barrier model. Background Art

[0002] The special characteristics of the aluminum honeycomb structure can consume a lot of energy under impact conditions and has good impact resistance. In the field of automobile research and development, the high energy absorption of honeycomb aluminum is used to manufacture all deformable energy-absorbing barriers in collision regulations. By changing the size and stiffness of honeycomb aluminum, the structural characteristics of the front end of the impact vehicle in different working conditions can be simulated. According to the stiffness curve requirements of the collision condition, the size of the honeycomb hole is adjusted, and the material strength of some honeycomb structures is reduced through acid milling processes, etc., to achieve the strength equivalent replacement of the honeycomb aluminum barrier for the front end of the vehicle.

[0003] In order to reduce design costs and improve efficiency, simulation has become an important method and means for automobile collision safety design and improvement during automobile research and development. The precision and accuracy of automobile collision simulation is not only related to the finite element software's own algorithm, but also largely depends on the accuracy of the simulation model. Therefore, the accuracy of the honeycomb aluminum barrier model is very important during collision simulation calculations. During the production process of the honeycomb aluminum barrier, the aluminum honeycomb block is glued to the contact plate and then riveted to the skin.

[0004] In the existing honeycomb aluminum barrier model, the skin and contact plate are modeled by two-dimensional shell elements. Figure 1 As shown in , however, the equivalent model obtained by this method has a large mesh size. In the case of large deformation, extrusion or impact, the two-dimensional shell elements that have reached the failure strain or the cumulative damage threshold are deleted first when the skin and contact plate are torn. Subsequently, the structural strength of the nearby position will be significantly reduced due to the loss of the structure, and the crack will propagate along the unit deletion position. The tearing form is as follows Figure 2 As shown, there are certain differences from the actual representation, resulting in low simulation accuracy of the barrier model. Summary of the invention

[0005] The present application provides a method, device, equipment and medium for high-precision modeling of the front face of a barrier model to solve the problems of low simulation accuracy of barrier models in the prior art.

[0006] The first aspect of the present application provides a high-precision modeling method for the front end face of a barrier model, comprising the following steps: identifying the front end face structure of the barrier model; modeling the front end face structure as a multi-layer two-dimensional shell unit, generating a three-dimensional unit based on the nodes of the multi-layer two-dimensional shell unit, and coupling the multi-layer two-dimensional shell unit with the three-dimensional unit to obtain a finite element model; obtaining the target failure parameters of the front end face structure material and the three-dimensional unit material in the finite element model, and establishing the front end face model of the barrier model according to the target failure parameters and the finite element model.

[0007] Optionally, the multi-layer two-dimensional shell unit includes a first layer of two-dimensional shell units and a second layer of two-dimensional shell units, and the three-dimensional unit is located between the first layer of two-dimensional shell units and the second layer of two-dimensional shell units. The three-dimensional unit is generated according to the nodes of the multi-layer two-dimensional shell units, including: identifying the first position information of all nodes of the first layer of two-dimensional shell units and the second position information of all nodes of the second layer of two-dimensional shell units; identifying multiple groups of adjacent nodes on the first layer of two-dimensional shell units and the second layer of two-dimensional shell units based on the first position information and the second position information; establishing new nodes between the multiple groups of adjacent nodes; and generating three-dimensional units based on the new nodes and adjacent nodes.

[0008] Optionally, coupling multiple layers of two-dimensional shell units and three-dimensional units to obtain a finite element model includes: identifying third position information of all nodes of the three-dimensional units; determining the positional relationship between the third position information and the first position information, or between the third position information and the second position information; if the positional relationships are the same, coupling the nodes of the three-dimensional units with the nodes of the first layer of two-dimensional shell units, and / or the second layer of two-dimensional shell units to obtain a finite element model.

[0009] Optionally, edge directions of the first-layer two-dimensional shell elements and the second-layer two-dimensional shell elements are perpendicularly crossed.

[0010] Optionally, target failure parameters of the front face structural material and the three-dimensional unit material in the finite element model are obtained, including: setting initial failure parameters of the front face structural material and the three-dimensional unit material; performing a static crush test and a dynamic impact test on the aluminum honeycomb block; and adjusting the initial failure parameters according to the results of the dynamic impact test to obtain the target failure parameters.

[0011] Optionally, after the aluminum honeycomb block is subjected to a static crush test and a dynamic impact test, the method further includes: adjusting the strength parameters of the aluminum honeycomb block according to the static crush test results.

[0012] Optionally, after establishing the front face model of the barrier model according to the target failure parameters and the finite element model, it also includes: constructing a finite element model of the aluminum honeycomb block; constructing the barrier model based on the finite element model and the front face model of the aluminum honeycomb block, wherein the nodes of the aluminum honeycomb block are connected to the second layer of two-dimensional shell units in a point-to-surface contact manner.

[0013] The second aspect of the present application provides a high-precision modeling device for the front end face of a barrier model, including: an identification module for identifying the front end face structure of the barrier model; a coupling module for modeling the front end face structure as a multi-layer two-dimensional shell unit, generating a three-dimensional unit according to the nodes of the multi-layer two-dimensional shell unit, and coupling the multi-layer two-dimensional unit with the three-dimensional unit to obtain a finite element model; an establishment module for acquiring the target failure parameters of the front end face structure material and the three-dimensional unit material in the finite element model, and establishing the front end face model of the barrier model according to the target failure parameters and the finite element model.

[0014] Optionally, the multi-layer two-dimensional shell unit includes a first layer of two-dimensional shell units and a second layer of two-dimensional shell units, and the three-dimensional unit is located between the first layer of two-dimensional shell units and the second layer of two-dimensional shell units, and the coupling module is further used to: identify first position information of all nodes of the first layer of two-dimensional shell units and second position information of all nodes of the second layer of two-dimensional shell units; identify multiple groups of adjacent nodes on the first layer of two-dimensional shell units and the second layer of two-dimensional shell units based on the first position information and the second position information; establish new nodes between the multiple groups of adjacent nodes; and generate three-dimensional units based on the new nodes and adjacent nodes.

[0015] Optionally, the coupling module is further used to: identify the third position information of all nodes of the three-dimensional unit; determine the positional relationship between the third position information and the first position information, or the third position information and the second position information; if the positional relationship is the same, couple the nodes of the three-dimensional unit with the nodes of the first layer of two-dimensional shell units, or with the nodes of the second layer of two-dimensional shell units to obtain a finite element model.

[0016] Optionally, edge directions of the first-layer two-dimensional shell elements and the second-layer two-dimensional shell elements are perpendicularly crossed.

[0017] Optionally, the establishment module is further used to: set initial failure parameters of the front face structural material and the three-dimensional unit material; perform static crush test and dynamic impact test on the aluminum honeycomb block; adjust the initial failure parameters according to the results of the dynamic impact test to obtain the target failure parameters.

[0018] Optionally, it also includes: an adjustment module for adjusting the strength parameters of the aluminum honeycomb block according to the static crush test results after the aluminum honeycomb block is subjected to a static crush test and a dynamic impact test.

[0019] Optionally, it also includes: a construction module, which is used to construct a finite element model of the aluminum honeycomb block after establishing the front end face model of the barrier model according to the target failure parameters and the finite element model; constructing the barrier model based on the finite element model and the front end face model of the aluminum honeycomb block, wherein the nodes of the aluminum honeycomb block are connected to the second layer of two-dimensional shell elements in a point-to-surface contact manner.

[0020] The third aspect of the present application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to execute a high-precision modeling method for the front face of a barrier model as described in the above embodiment.

[0021] The fourth aspect of the present application provides a computer-readable storage medium having a computer program or instructions stored thereon, and the computer program or instructions are executed by a processor to perform a high-precision modeling method for the front face of a barrier model as in the above-mentioned embodiment.

[0022] Therefore, this application has at least the following beneficial effects:

[0023] The embodiment of the present application can model the front face structure of the barrier model as a multi-layer two-dimensional shell unit, generate three-dimensional units according to the nodes of the multi-layer two-dimensional shell unit, couple the multi-layer two-dimensional shell unit with the three-dimensional unit to obtain a finite element model, and set target failure parameters for the front face structure material and the three-dimensional unit material. The front face model of the barrier model is established according to the failure parameters and the finite element model. By setting the failure parameters, the generation of grid distortion can be effectively suppressed during model calculation, and excessive tensile stress caused by unit pulling can be avoided, thereby improving the simulation accuracy of the model and the stability of the model calculation. Therefore, the technical problems of low simulation accuracy of barrier models in the prior art are solved.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0026] Figure 1 Modeling schematic diagram for existing barrier model;

[0027] Figure 2 A schematic diagram of the tearing form of the skin and contact plate in the existing barrier model;

[0028] Figure 3 A flowchart of a method for high-precision modeling of the front face of a barrier model provided according to an embodiment of the present application;

[0029] Figure 4 A schematic diagram of a finite element model of an aluminum honeycomb block provided according to an embodiment of the present application;

[0030] Figure 5 A schematic diagram of modeling of a skin and a contact plate provided according to an embodiment of the present application;

[0031] Figure 6 An overall relationship diagram of the modeling of the skin and the contact plate provided according to an embodiment of the present application;

[0032] Figure 7 A local relationship diagram of the modeling of the skin and the contact plate provided according to an embodiment of the present application;

[0033] Figure 8 A schematic diagram of the connection between the aluminum honeycomb block and the contact plate provided according to an embodiment of the present application;

[0034] Fig. 9This is an example diagram of a high-precision modeling device for the front face of a barrier model provided according to an embodiment of the present application;

[0035] Fig.10 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0037] The following describes the high-precision modeling method, device, equipment and medium for the front face of the barrier model of an embodiment of the present application with reference to the accompanying drawings. In the existing honeycomb aluminum barrier model mentioned in the background technology, the skin and contact plate are simulated by two-dimensional shell units. The equivalent model obtained by this method has a large grid size. When encountering large deformation, extrusion or impact, the skin and contact plate are torn, and the two-dimensional shell units that reach the failure strain or the cumulative damage reaches the threshold are deleted first. Then the structural strength of the nearby position will be significantly reduced due to the loss of the structure, and the cracks will extend along the unit deletion position. There is a certain difference from the actual manifestation, and the simulation accuracy is low. The present application provides a high-precision modeling method for the front face of the barrier model. In this method, the front face structure of the barrier model can be modeled as a multi-layer two-dimensional shell unit, and a three-dimensional unit is generated according to the nodes of the multi-layer two-dimensional shell unit. The multi-layer two-dimensional shell unit and the three-dimensional unit are coupled to obtain a finite element model, and the target failure parameters are set for the front face structural material and the three-dimensional unit material. The front face model of the barrier model is established according to the failure parameters and the finite element model. By setting the failure parameters, the generation of grid distortion can be effectively suppressed during model calculation, and excessive tensile stress caused by unit pulling can be avoided, thereby improving the simulation accuracy of the model and the stability of model calculation. Thus, the problem of low simulation accuracy of the barrier model in the prior art is solved.

[0038] Specifically, Figure 3 A schematic flow chart of a method for high-precision modeling of the front face of a barrier model provided in an embodiment of the present application.

[0039] like Figure 3 As shown, the high-precision modeling method for the front face of the barrier model includes the following steps:

[0040] In step S101 , the front face structure of the barrier model is identified.

[0041] Among them, the front face structure is mainly composed of skin and contact plate, and the barrier model mainly includes two parts, aluminum honeycomb block and skin and contact plate.

[0042] It can be understood that the embodiment of the present application can identify the front face structure of the barrier model to facilitate subsequent modeling.

[0043] In step S102, the front face structure is modeled as a multi-layer two-dimensional shell element, a three-dimensional element is generated according to the nodes of the multi-layer two-dimensional shell element, and the multi-layer two-dimensional shell element and the three-dimensional element are coupled to obtain a finite element model.

[0044] Among them, the multi-layer two-dimensional shell unit includes a first layer of two-dimensional shell units and a second layer of two-dimensional shell units, and the three-dimensional units are located between the first layer of two-dimensional shell units and the second layer of two-dimensional shell units. The edge directions of the first layer of two-dimensional shell units and the second layer of two-dimensional shell units are perpendicularly crossed, that is, the grid directions during modeling are perpendicularly crossed, so as to improve the ability to capture the behavior of the system under large deformation or impact conditions. The first layer of two-dimensional shell units can be skins, and the second layer of two-dimensional shell units can be contact plates.

[0045] It can be understood that the embodiment of the present application can model the front face structure as a multi-layer two-dimensional shell unit, and generate three-dimensional units based on the nodes of the multi-layer two-dimensional shell units, and then couple the multi-layer two-dimensional shell units with the three-dimensional ternary elements to obtain a finite element model of the front face, which can also become a finite element model of the skin and contact plate.

[0046] In an embodiment of the present application, three-dimensional units are generated based on the nodes of multiple layers of two-dimensional shell units, including: identifying first position information of all nodes of the first layer of two-dimensional shell units and second position information of all nodes of the second layer of two-dimensional shell units; identifying multiple groups of adjacent nodes on the first layer of two-dimensional shell units and the second layer of two-dimensional shell units based on the first position information and the second position information; establishing new nodes between the multiple groups of adjacent nodes; and generating three-dimensional units based on the new nodes and the adjacent nodes.

[0047] It can be understood that the embodiments of the present application can identify the first position information of the nodes on the first layer of two-dimensional shell elements, and the second position information of the nodes on the second layer of two-dimensional shell elements, and identify multiple groups of adjacent nodes on the first layer of two-dimensional shell elements and the second layer of two-dimensional shell elements based on the first position information and the second position information, and establish new nodes between the multiple groups of adjacent nodes, generate three-dimensional elements based on the new nodes and the adjacent nodes, and judge the positional relationship of the nodes on the first layer of two-dimensional shell elements and the second layer of two-dimensional shell elements based on the position information.

[0048] In an embodiment of the present application, a finite element model is obtained by coupling multiple layers of two-dimensional shell units with three-dimensional units, including: identifying third position information of all nodes of the three-dimensional units; determining the positional relationship between the third position information and the first position information, or between the third position information and the second position information; if the positional relationships are the same, coupling the nodes of the three-dimensional units with the nodes of the first layer of two-dimensional shell units, and / or the second layer of two-dimensional shell units to obtain the finite element model.

[0049] It can be understood that the embodiments of the present application can identify the third position information of the nodes of the three-dimensional unit, and determine the positional relationship between the third position information and the first position information, or the third position information and the second position information. If the positional relationships are the same, such as the same coordinates in the same coordinate system, the nodes with the same coordinates are coupled together to finally obtain a finite element model, in which node coupling can be achieved through common node modeling or contact algorithm.

[0050] In step S103, target failure parameters of the front face structural material and the three-dimensional unit material in the finite element model are obtained, and a front face model of the barrier model is established according to the target failure parameters and the finite element model.

[0051] Among them, the target failure parameter is the critical condition under which the material begins to undergo permanent deformation or damage under characteristic conditions.

[0052] Since the skin and contact plate in the existing barrier model are mainly simulated by two-dimensional units, when the skin and contact plate are torn, the two-dimensional shell units that have reached the failure strain or the cumulative damage has reached the threshold are preferentially deleted. Subsequently, the structural strength of the nearby position will be significantly reduced due to the structural loss, and the crack will propagate along the unit deletion position, which is different from the actual manifestation. Therefore, the embodiment of the present application can add target failure parameters of the front face structural material and the three-dimensional unit material in the modeling, and establish the front face model of the barrier model according to the target failure parameters and the finite element model, so as to improve the simulation accuracy of the barrier model.

[0053] In an embodiment of the present application, the target failure parameters of the front face structural material in the finite element model are obtained, including: setting the initial failure parameters of the front face structural material and the three-dimensional unit material; performing a static crush test and a dynamic impact test on the aluminum honeycomb block; and adjusting the initial failure parameters according to the results of the dynamic impact test to obtain the target failure parameters.

[0054] It can be understood that the embodiments of the present application can set the initial failure parameters of the front end face structural material, and conduct static compression tests and dynamic impact tests on the aluminum honeycomb blocks. The initial failure parameters are adjusted according to the results of the dynamic impact test to obtain the target failure parameters, thereby adjusting the material failure parameters through the test, making the front end face structure closer to the actual test during the simulation deformation process, and improving the simulation accuracy of the model.

[0055] It should be noted that the failure form of the front face structural material in the embodiment of the present application, that is, the failure form of the two-dimensional shell unit, is preferably the Gissmo failure model, which takes into account the nonlinear damage accumulation method and the coupling between equivalent stress and damage, and is suitable for the characterization of fracture failure under complex working conditions. The failure form of the three-dimensional unit material monitors the stress and energy information of the solid unit through parameters, and deletes the unit after reaching the threshold.

[0056] In the embodiment of the present application, after the aluminum honeycomb block is subjected to a static crush test and a dynamic impact test, the method further includes: adjusting the strength parameters of the aluminum honeycomb block according to the results of the static crush test.

[0057] It is understandable that the embodiment of the present application can adjust the strength parameters of the aluminum honeycomb block according to the static crush test results, so that when the barrier model is subsequently constructed, the simulation effect of the barrier model can be closer to reality and the simulation accuracy can be improved.

[0058] In an embodiment of the present application, after establishing the front face model of the barrier model according to the target failure parameters and the finite element model, it also includes: constructing a finite element model of the aluminum honeycomb block; constructing the barrier model based on the finite element model and the front face model of the aluminum honeycomb block, wherein the nodes of the aluminum honeycomb block are connected to the second layer of two-dimensional shell units in a point-to-surface contact manner.

[0059] It can be understood that the embodiment of the present application can construct a finite element model of the aluminum honeycomb block, and construct a barrier model based on the finite element model of the aluminum honeycomb block and the front face model, wherein the grid nodes of the aluminum honeycomb block are connected to the second layer of two-dimensional shell units (contact plates) of the front face model in the form of point-to-surface contact. The point-to-surface connection relationship can more accurately simulate the connection method between the honeycomb block and the contact plate in the actual structure, which not only considers the matching in geometric position, but also ensures the continuity of force and deformation transmission, thereby improving the simulation accuracy of the barrier model, and only the position where the skin and the contact plate are connected to the aluminum honeycomb block is refined and modeled, and the number of finite grid increments is small, so that the impact on the calculation efficiency of the model is also small.

[0060] Specifically, the high-precision modeling method for the front face of the barrier model of the embodiment of the present application, that is, the high-precision modeling of the honeycomb aluminum barrier skin and the contact plate by finite element simulation, mainly includes the following steps:

[0061] S1: Establish the equivalent finite element model of aluminum honeycomb block;

[0062] S2: Establish the finite element model of the honeycomb aluminum skin and contact plate, which is equivalently modeled by two layers of two-dimensional shell elements and one layer of three-dimensional solid elements;

[0063] S3: Two layers of two-dimensional shell elements are in opposite directions and cross each other at 90°.

[0064] S4: A three-dimensional solid element is built between two layers of two-dimensional shell elements.

[0065] S5: The three-dimensional solid element and the two-dimensional shell element are connected in the form of node coupling to ensure the continuity of force and deformation transmission;

[0066] S6: The nodes of the honeycomb aluminum block are connected to the adjacent contact plates through point-to-surface bonding contact.

[0067] S7: The failure mode of two-dimensional shell element materials, preferably the Gissmo failure model, takes into account the nonlinear damage accumulation mode and the coupling between equivalent stress and damage, which is suitable for the characterization of fracture failure under complex working conditions.

[0068] S8: Failure form of three-dimensional solid unit material. The stress and energy information of the solid unit are monitored through parameters, and the unit is deleted when the threshold is reached.

[0069] S9: Design a test matrix to carry out static crushing and dynamic impact tests on aluminum honeycomb blocks.

[0070] S10: The honeycomb block simulation model is simulated and benchmarked according to the test loading settings. The material failure parameters are adjusted to make the deformation of the honeycomb aluminum skin and contact plate close to the test, and the final parameters are obtained;

[0071] S11: According to the final parameter setting, the simulation form of the honeycomb aluminum skin and contact plate is modified.

[0072] The following describes the high-precision modeling of the barrier skin and contact plate finite element simulation through a specific embodiment, including:

[0073] 1. According to the overall size of the aluminum honeycomb block and the size of the honeycomb holes, a finite element equivalent model after cell expansion is established.

[0074] 2. The dimensions of the aluminum honeycomb block are length (L) 250mm, width (W) 250mm, and height (T) 100mm.

[0075] 3. To ensure the accuracy of the simulation model, the diameter of the honeycomb hole after cell expansion is 25.98mm and the side length is 15mm. During the parameter adjustment process, the honeycomb size settings of all models are kept consistent.

[0076] 4. Establish a honeycomb structure grid with three two-dimensional shell elements on each edge, and the unit length is 5 mm.

[0077] 5. According to the size of the aluminum honeycomb block and the size ratio of the honeycomb holes, the honeycomb block is array modeled. The number of honeycomb holes in the T direction is 100mm / 5mm=20, the number of honeycomb holes in the W direction is 250mm / 25.98mm≈9, and the number of honeycomb holes in the L direction is 250mm / 15mm / 2≈8. The finite element model of the aluminum honeycomb block is as follows: Figure 4 shown.

[0078] 6. The skin and contact plate are modeled using two layers of two-dimensional shell elements, named itermediateplate1 and intermediateplate2, respectively. The grid direction of intermediateplate1 is vertically inclined at 45°, and the grid direction of intermediateplate2 is vertically inclined at -45°. The grid spacing between the two layers of shell elements is 0.2 mm. The modeling of the skin and contact plate is as follows: Figure 5 shown.

[0079] 7. Generate three-dimensional solid elements (i.e. three-dimensional elements) based on the mesh nodes of itermediateplate1 and intermediate plate2 and name them adhesive.

[0080] 8. All nodes of the solid unit are coupled to the adjacent shell unit nodes. Common node modeling can ensure the connectivity between units, the displacement and strain continuity at the interface, and the stable force transmission channel between materials, so that the transmission of load and deformation during the analysis process is accurate and reliable.

[0081] 9. The overall relationship between skin and contact plate modeling is as follows Figure 6 As shown, the local relationship is Figure 7 As shown in the figure, a unit in intermediateplate1 is composed of nodes 2-3-5-4 to form a quadrilateral shell unit, a unit in intermediateplate2 is composed of nodes 1'-3'-6'-4' to form a quadrilateral shell unit, and adhesive is composed of two hexahedral solid units 1-3-4-2-1'-3'-4'-2' and 3-5-6-4-3'-5'-6'-4' respectively.

[0082] 10. The skin and contact plate are connected to the aluminum honeycomb block. In the simulation pre-processing software, the nodes of the adjacent surfaces of the aluminum honeycomb block model and the contact plate are set and connected through the node-surface connection relationship. Considering the need to calibrate the material failure parameters of the skin and contact plate, no structural failure is set for this connection relationship. The connection between the aluminum honeycomb block and the contact plate is as follows: Figure 8 shown.

[0083] 11. The failure modes of skin and contact plate are calibrated by adjusting the failure parameters of 2D shell elements and 3D solid elements.

[0084] 12. Failure form of two-dimensional shell element materials. The Gissmo failure model is preferred. Gissmo considers the nonlinear damage accumulation mode and the coupling between equivalent stress and damage, and is suitable for the characterization of fracture failure under complex working conditions. By designing material tests under typical working conditions of aluminum plates, the failure strain of the material under specific stress triaxiality is characterized, and the complete "stress triaxiality-failure strain" curve is obtained through curve fitting to improve the reliability of the simulation results.

[0085] 13. Failure forms of three-dimensional solid unit materials. By monitoring the stress and energy information of solid units through parameters, and timely deleting units with large energy after reaching the threshold, excessive tensile stress caused by unit distortion can be avoided, thereby ensuring the accuracy of simulation and the stability of model calculation.

[0086] 14. Design static crushing and dynamic impact tests of aluminum honeycomb blocks. The test parameters are shown in Table 1. Table 1 is the test parameter table.

[0087] Table 1

[0088]

[0089] 15. The aluminum honeycomb block model is benchmarked according to the working condition setting. The parameters of the honeycomb aluminum body are adjusted to make its strength consistent with the test with reference to the static crush test results. The failure parameters of the two-dimensional shell unit and three-dimensional solid material are adjusted with reference to the dynamic impact test results, and the crack propagation form of the honeycomb aluminum skin and contact plate is optimized to be close to the test.

[0090] The barrier model is modeled by the above-mentioned simulation and experimental methods, so that when the simulation model copes with large deformation, extrusion or impact, the deformation of the front end skin and contact plate of the honeycomb aluminum is closer to the actual one, thereby improving the simulation accuracy of the honeycomb aluminum barrier model. Specifically, after the skin and contact plate are refined and modeled, the accuracy of the simulation model in calculating the failure mode of the skin and contact plate can be improved, the model accuracy can be improved, and the original grid size is maintained. Only the location where the skin and contact plate are connected to the honeycomb block is refined and modeled. The number of finite element grids increased is less than 1%, which has little effect on the model calculation efficiency. The failure parameter setting of the skin and contact plate modeling can effectively suppress the generation of grid distortion during model calculation, avoid excessive tensile stress caused by unit pulling, thereby ensuring the accuracy of the simulation and the stability of the model calculation, and saving calculation time.

[0091] According to the high-precision modeling method of the front end face of the barrier model proposed in the embodiment of the present application, the front end face structure of the barrier model can be modeled as a multi-layer two-dimensional shell unit, and three-dimensional units can be generated according to the nodes of the multi-layer two-dimensional shell unit. The multi-layer two-dimensional shell unit and the three-dimensional unit are coupled to obtain a finite element model, and target failure parameters are set for the front end face structure material and the three-dimensional unit material. The front end face model of the barrier model is established according to the failure parameters and the finite element model. By setting the failure parameters, the generation of mesh distortion can be effectively suppressed during model calculation, and excessive tensile stress caused by unit pulling can be avoided, thereby improving the simulation accuracy of the barrier model and the stability of the model calculation.

[0092] Next, a high-precision modeling device for the front face of a barrier model proposed in an embodiment of the present application will be described with reference to the accompanying drawings.

[0093] Fig. 9 It is a block diagram of a high-precision modeling device for the front face of a barrier model according to an embodiment of the present application.

[0094] like Fig. 9 As shown, the high-precision modeling device 10 for the front face of the barrier model includes: an identification module 100 , a coupling module 200 and an establishment module 300 .

[0095] Among them, the identification module 100 is used to identify the front face structure of the barrier model; the coupling module 200 is used to model the front face structure as a multi-layer two-dimensional shell unit, generate a three-dimensional unit according to the nodes of the multi-layer two-dimensional shell unit, and couple the multi-layer two-dimensional unit with the three-dimensional unit to obtain a finite element model; the establishment module 300 is used to obtain the target failure parameters of the front face structure material and the three-dimensional unit material in the finite element model, and establish the front face model of the barrier model according to the target failure parameters and the finite element model.

[0096] In an embodiment of the present application, the multi-layer two-dimensional shell unit includes a first layer of two-dimensional shell units and a second layer of two-dimensional shell units, and the three-dimensional unit is located between the first layer of two-dimensional shell units and the second layer of two-dimensional shell units. The coupling module 200 is further used to: identify the first position information of all nodes of the first layer of two-dimensional shell units and the second position information of all nodes of the second layer of two-dimensional shell units; identify multiple groups of adjacent nodes on the first layer of two-dimensional shell units and the second layer of two-dimensional shell units based on the first position information and the second position information; establish new nodes between the multiple groups of adjacent nodes; and generate three-dimensional units based on the new nodes and adjacent nodes.

[0097] In an embodiment of the present application, the coupling module 200 is further used to: identify the third position information of all nodes of the three-dimensional unit; determine the positional relationship between the third position information and the first position information, or the third position information and the second position information; if the positional relationship is the same, couple the nodes of the three-dimensional unit with the nodes of the first layer of two-dimensional shell units, or and / or the nodes of the second layer of two-dimensional shell units to obtain a finite element model.

[0098] In the embodiment of the present application, the edge directions of the first layer of two-dimensional shell elements and the second layer of two-dimensional shell elements are perpendicularly crossed.

[0099] In an embodiment of the present application, the establishment module 300 is further used to: set the initial failure parameters of the front face structural material and the three-dimensional unit material; perform static crush tests and dynamic impact tests on the aluminum honeycomb blocks; and adjust the initial failure parameters according to the results of the dynamic impact test to obtain the target failure parameters.

[0100] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: an adjustment module.

[0101] The adjustment module is used to adjust the strength parameters of the aluminum honeycomb block according to the results of the static crush test after the aluminum honeycomb block is subjected to a static crush test and a dynamic impact test.

[0102] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: a construction module.

[0103] Among them, the construction module is used to construct a finite element model of the aluminum honeycomb block after the front end face model of the barrier model is established according to the target failure parameters and the finite element model; the barrier model is constructed based on the finite element model and the front end face model of the aluminum honeycomb block, wherein the nodes of the aluminum honeycomb block are connected to the second layer of two-dimensional shell elements in a point-to-surface contact manner.

[0104] It should be noted that the aforementioned explanation of the embodiment of the method for high-precision modeling of the front face of the barrier model is also applicable to the device for high-precision modeling of the front face of the barrier model of this embodiment, and will not be repeated here.

[0105] According to the high-precision modeling device of the front end face of the barrier model proposed in the embodiment of the present application, the front end face structure of the barrier model can be modeled as a multi-layer two-dimensional shell unit, and three-dimensional units are generated according to the nodes of the multi-layer two-dimensional shell units. The multi-layer two-dimensional shell units and the three-dimensional units are coupled to obtain a finite element model, and target failure parameters are set for the front end face structure material and the three-dimensional unit material. The front end face model of the barrier model is established according to the failure parameters and the finite element model. By setting the failure parameters, the generation of grid distortion can be effectively suppressed during model calculation, and excessive tensile stress caused by unit pulling can be avoided, thereby improving the simulation accuracy of the barrier model and the stability of the model calculation.

[0106] Fig.10 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0107] A memory 1001 , a processor 1002 , and a computer program stored in the memory 1001 and executable on the processor 1002 .

[0108] When the processor 1002 executes the program, the high-precision modeling method for the front face of the barrier model provided in the above embodiment is implemented.

[0109] Furthermore, the electronic device further comprises:

[0110] The communication interface 1003 is used for communication between the memory 1001 and the processor 1002 .

[0111] The memory 1001 is used to store computer programs that can be executed on the processor 1002 .

[0112] The memory 1001 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0113] If the memory 1001, the processor 1002 and the communication interface 1003 are implemented independently, the communication interface 1003, the memory 1001 and the processor 1002 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.10 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0114] Optionally, in a specific implementation, if the memory 1001, the processor 1002 and the communication interface 1003 are integrated on a chip, the memory 1001, the processor 1002 and the communication interface 1003 can communicate with each other through an internal interface.

[0115] The processor 1002 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0116] An embodiment of the present application also provides a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the high-precision modeling method of the front face of the barrier model as described above is implemented.

[0117] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0118] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0119] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0120] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0121] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A high-precision modeling method for the front face of a barrier model, characterized in that: The following steps are involved: Identify the front face structure of the barrier model; Modeling the front face structure as a multi-layer two-dimensional shell element, generating a three-dimensional element according to the nodes of the multi-layer two-dimensional shell element, and coupling the multi-layer two-dimensional shell element with the three-dimensional element to obtain a finite element model; The target failure parameters of the front face structural material and the three-dimensional unit material in the finite element model are obtained, and the front face model of the barrier model is established according to the target failure parameters and the finite element model.

2. The high-precision modeling method for the front face of a barrier model according to claim 1, characterized in that: The multi-layer two-dimensional shell element comprises a first layer of two-dimensional shell elements and a second layer of two-dimensional shell elements, the three-dimensional element is located between the first layer of two-dimensional shell elements and the second layer of two-dimensional shell elements, and the three-dimensional element is generated according to the nodes of the multi-layer two-dimensional shell elements, comprising: Identifying first position information of all nodes of the first layer of two-dimensional shell elements and second position information of all nodes of the second layer of two-dimensional shell elements; Identify a plurality of groups of adjacent nodes on the first layer of two-dimensional shell elements and the second layer of two-dimensional shell elements based on the first position information and the second position information; Establishing new nodes between the multiple groups of adjacent nodes; The three-dimensional unit is generated based on the new node and the adjacent nodes.

3. The high-precision modeling method for the front face of a barrier model according to claim 2, characterized in that: The coupling of the multi-layer two-dimensional shell element and the three-dimensional element to obtain a finite element model includes: Identifying third position information of all nodes of the three-dimensional unit; Determining a positional relationship between the third position information and the first position information, or between the third position information and the second position information; If the positional relationship is the same, the nodes of the three-dimensional unit are coupled with the nodes of the first-layer two-dimensional shell unit and / or the second-layer two-dimensional shell unit to obtain the finite element model.

4. The high-precision modeling method for the front face of a barrier model according to claim 2, characterized in that: The edge directions of the first layer of two-dimensional shell elements and the second layer of two-dimensional shell elements are perpendicularly crossed.

5. The high-precision modeling method for the front face of a barrier model according to claim 1, characterized in that: The obtaining of target failure parameters of the front face structural material and the three-dimensional unit material in the finite element model includes: Setting initial failure parameters of the front face structural material and the three-dimensional unit material; Conduct static crush test and dynamic impact test on aluminum honeycomb blocks; The initial failure parameter is adjusted according to the result of the dynamic impact test to obtain the target failure parameter.

6. The high-precision modeling method for the front face of a barrier model according to claim 5, characterized in that: After the static crush test and dynamic impact test of the aluminum honeycomb block, it also includes: The strength parameters of the aluminum honeycomb block are adjusted according to the static crush test results.

7. The high-precision modeling method for the front face of a barrier model according to claim 6, characterized in that: After establishing the front face model of the barrier model according to the target failure parameter and the finite element model, the method further includes: Constructing a finite element model of the aluminum honeycomb block; A barrier model is constructed based on the finite element model of the aluminum honeycomb block and the front face model, wherein the nodes of the aluminum honeycomb block are connected to the second layer of two-dimensional shell elements in a point-to-surface contact manner.

8. A high-precision modeling device for the front face of a barrier model, characterized in that: include: An identification module, used to identify the front face structure of the barrier model; A coupling module, used for modeling the front face structure as a multi-layer two-dimensional shell unit, generating a three-dimensional unit according to the nodes of the multi-layer two-dimensional shell unit, and coupling the multi-layer two-dimensional shell unit with the three-dimensional unit to obtain a finite element model; A building module is provided for obtaining target failure parameters of the front face structural material and the three-dimensional unit material in the finite element model, and building a front face model of the barrier model according to the target failure parameters and the finite element model.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the high-precision modeling method for the front face of a barrier model as described in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: The computer program or instructions are executed by a processor to implement the high-precision modeling method for the front face of a barrier model as described in any one of claims 1-6.

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