A method, device and storage medium for simulating weld failure based on vehicle crashworthiness

Abstract

The present invention discloses a method for simulating weld failure based on the crashworthiness of a whole vehicle, which belongs to the field of simulation analysis technology and includes the following steps: obtaining the material grades of all components connected by welds; sorting out the yield strength of the corresponding grades based on the statistical table of material grades used for vehicle models and in combination with the corporate standards of each enterprise, for solving the subsequent weld material parameters; screening out the weld connection pairs defined by the vehicle model, and selecting the lower value of the yield strength in the connection pair as the failure reference yield strength; obtaining the weld failure force parameters, bringing the material parameters and weld failure force parameters into the weld material MAT100 control card, and assigning them to the components corresponding to different weld groups; inputting the material parameters and weld failure force parameters into finite element analysis software for solution and calculation. The weld failure simulation method of the present invention quickly simulates and obtains the weld failure parameters by defining the basic properties of the material, thereby realizing the evaluation of the whole vehicle crashworthiness structure and the prediction of the weld failure risk.

Description

Technical Field

[0001] The present invention belongs to the technical field of simulation analysis, and in particular relates to a method, device and storage medium for simulating weld failure based on the crashworthiness of a whole vehicle. Background Art

[0002] When developing vehicle crashworthiness, simulation analysis is essential to predict the rationality of structural and connection designs. For high-speed collisions, sheet metal cracking and weld tearing are key factors limiting the accuracy of performance simulations. Simulating weld connections is particularly challenging.

[0003] For high-speed collision conditions, sheet metal cracking and weld tearing become key factors limiting the accuracy of performance simulations. Simulating solder joints is particularly challenging. Current mainstream approaches rely on extensive testing to determine physical properties, then iteratively solve them using detailed models to ultimately determine the simulation input parameters.

[0004] The mainstream solder joint simulation methods in the existing Ls-dyna software are as follows:

[0005] Method 1: Use beam elements (BEAM) or solid elements (SOLID, which can be divided into HEX, 4HEX, 8HEX, and 16HEX according to the difference in element type) to simulate the welds, and use the MAT100 material card to simulate the definition of the weld failure force. If the failure judgment standard is met, the corresponding beam element is deleted to simulate the cracking state of the weld. The parameters are obtained through experiments. The advantages of this method are: the failure force parameters obtained through experiments are highly accurate, and the disadvantages are: high cost and long cycle. Since there are hundreds of combinations of failure force combinations of welds with different strength plate combinations in the whole vehicle, the cost of the method obtained through experiments is high, and the cycle of testing-parameter extraction-assignment to different combinations of welds is long (generally, the current requirement for establishing a round of whole vehicle crashworthiness simulation model is to be completed within one week), which does not meet the requirements of the whole vehicle crashworthiness simulation cycle.

[0006] Method 2: The weld point uses a rigid unit (RIGID). The weld point itself is not set to fail. The failure is to make a circle of washer hole units (such as Figure 3 ), the shell element (SHELL) is used to simulate the heat affected zone of the solder joint, and a separate failure material is assigned to the WASHER element. The failure of the shell is used to simulate the failure of the solder joint.

[0007] Both of the above methods require extensive testing of basic connection characteristics, followed by parameter solution or simulation iterations before the relevant weld failure parameters can be obtained. This results in high costs and long cycles in actual engineering applications, making them unsuitable for the early simulation analysis phase of a project. On the one hand, in vehicle safety development, the simulation analysis cycle for crashworthiness structures is relatively short, with a single round of analysis and optimization typically taking around a month. This inefficiency stems from the extensive testing and iteration of simulation sub-models. On the other hand, early project stages require optimization of different material and thickness combinations. Re-iterating solutions through experimental methods cannot fully leverage the simulation tools' ability to quickly identify risks and identify appropriate solutions. In particular, with advances in steel plate technology and the significant introduction of new materials, solutions accumulated through extensive testing are no longer feasible. Therefore, a simplified method suitable for the project development phase is needed that can quickly solve simulation parameters without compromising simulation computational efficiency. Summary of the Invention

[0008] In order to solve the above problems, the present invention provides a weld failure simulation method, equipment and storage medium based on the crash resistance of the whole vehicle. The weld failure simulation method of the present invention quickly simulates and obtains the weld failure parameters by defining the basic properties of the material, thereby realizing the crash resistance structure evaluation of the whole vehicle and the prediction of the weld failure risk.

[0009] The present invention is achieved through the following technical solutions:

[0010] In a first aspect, the present invention provides a method for simulating weld failure based on vehicle crashworthiness, comprising the following steps:

[0011] Step S1: Obtain the material grades of all components connected by the solder joints;

[0012] Step S2: Based on the statistical table of vehicle material grades compiled in step S1, the yield strength σ of the corresponding grades is compiled in combination with the corporate standards of each enterprise. s , used to solve the subsequent solder joint material parameters;

[0013] Step S3: Filter out the model-defined welding connection pairs and select the lower value of the yield strength in the connection pair as the failure benchmark yield strength σ s-pmin ; Wherein, the connection pair refers to a pair formed by two parts and their welding points that are directly connected in a two-layer or multi-layer connection relationship;

[0014] Step S4: Obtaining the failure force parameters of the solder joint, wherein the failure force parameters of the solder joint include the critical axial force fracture value NRR of the solder joint material and the critical shear force value NRT of the solder joint;

[0015] Step S5: Bring the material parameters and solder joint failure force parameters into the solder joint material MAT100 control card and assign them to the components corresponding to different solder joint groups; the material parameters include material density RO, Young's modulus E, Poisson's ratio PR, and reference yield strength σ s-pmin , tangent modulus ET;

[0016] Step S6: Inputting material parameters and weld failure force parameters into finite element analysis software for solution calculation.

[0017] Furthermore, the step S1 specifically sorts out the material grades used for the welding joint connectors of the whole vehicle by combing the BOM of the whole vehicle, and establishes a statistical table of material grades used for the vehicle models. The parameters of the statistical table of material grades used for the vehicle models include hierarchy, part number, Chinese name, material specification and material specification standard.

[0018] Furthermore, in step S2, if the yield strength σ of the corresponding grade s If it is an interval value, the average of its maximum and minimum values ​​is taken as the average yield strength σ m If the material has been tested, the test strength σ is directly taken. test .

[0019] Furthermore, in step S4, the critical axial force fracture value NRR of the weld material is obtained according to formula (1);

[0020] NRR=λ*σ s-pmin *T comb (1)

[0021] Among them, λ is the empirical coefficient, T comb is the combined thickness of the two components in the welded connection, i.e. T comb =T part1 +T part2 ;

[0022] Furthermore, in step S4, the critical shear force value NRT of the weld point is obtained according to formula (2);

[0023] NRT=μ*NRR (2)

[0024] Where μ is the conversion coefficient.

[0025] Furthermore, the material parameters in step S5 include material density RO, Young's modulus E, Poisson's ratio PR, reference yield strength σ s-pmin , tangent modulus ET;

[0026] In a second aspect, the present invention also provides a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, a method for simulating weld failure based on the crashworthiness of a whole vehicle as described in any one of the embodiments of the present invention is implemented.

[0027] In a third aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a weld failure simulation method based on vehicle crashworthiness as described in any one of the embodiments of the present invention.

[0028] Compared with the prior art, the advantages of the present invention are as follows:

[0029] a. This method, through the combination of material yield strength and thickness, has significant efficiency advantages over methods that rely on extensive testing and iterative sub-model simulations. It can quickly iterate solder joint failure parameters in the early stages of a project without affecting the original analysis cycle or the simulation modeling and solution workload.

[0030] b. The method for solving the failure characteristics of solder joint parameters provided by the present invention combines theoretical calculation with empirical formula calculation method, which is reproducible. That is, it can quickly solve the existing solder joint spacing, strength, and thickness, and timely implement simulation models to achieve risk optimization, which is a feature not available in traditional methods.

[0031] c. The welding quality of passenger car body and door cover welds follows a normal distribution, meaning the strength of all connection properties exhibits a statistically dispersed pattern. The stability of sample-level weld quality testing is significantly superior to the welding characteristics used on actual prototype vehicles. Therefore, parameters obtained using a single test method cannot accurately represent the precise values ​​of mechanical properties and still exhibit certain deviations. The failure participation obtained in this invention, based on theoretical calculations and engineering experience, essentially corresponds to the design median. This has been demonstrated through correlation comparisons with multiple vehicle model tests and simulations, demonstrating high accuracy and design guidance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0033] Figure 1 Schematic diagram of a flow chart of a method for simulating weld failure based on vehicle crashworthiness according to the present invention;

[0034] Figure 2 Schematic diagram of the specific steps of a method for simulating weld failure based on vehicle crashworthiness according to the present invention;

[0035] Figure 3 A schematic diagram of a connection pair of a method for simulating weld failure based on vehicle crashworthiness according to the present invention;

[0036] Among them: a is single-layer welding, b is double-layer welding;

[0037] Figure 4 This is a schematic structural diagram of an electronic device in Example 2 of the present invention. DETAILED DESCRIPTION

[0038] In order to clearly and completely describe the technical solution and specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings:

[0039] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0041] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 invention. 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0042] like Figure 1 FIG. 1 is a flow chart of a method for simulating weld failure based on vehicle crashworthiness according to the present invention, comprising the following steps:

[0043] Step S1: Obtain the material grades of all components connected by the solder joints;

[0044] Step S2: Based on the statistical table of vehicle material grades compiled in step S1, the yield strength σ of the corresponding grades is compiled in combination with the corporate standards of each enterprise. s , used to solve the subsequent solder joint material parameters;

[0045] Step S3: Filter out the model-defined welding connection pairs and select the lower value of the yield strength in the connection pair as the failure benchmark yield strength σ s-pmin ; Wherein, the connection pair refers to a pair formed by two parts and their welding points that are directly connected in a two-layer or multi-layer connection relationship;

[0046] Step S4: Obtaining the failure force parameters of the solder joint, wherein the failure force parameters of the solder joint include the critical axial force fracture value NRR of the solder joint material and the critical shear force value NRT of the solder joint;

[0047] Step S5: Bring the material parameters and solder joint failure force parameters into the solder joint material MAT100 control card and assign them to the components corresponding to different solder joint groups;

[0048] Step S6: Inputting material parameters and weld failure force parameters into finite element analysis software for solution calculation.

[0049] The step S1 specifically involves sorting out the BOM of the entire vehicle, obtaining the material grades used for the welding connectors of the entire vehicle, and establishing a statistical table of material grades used for the vehicle models. The parameters of the statistical table of material grades used for the vehicle models include hierarchy, part number, Chinese name, material specification and material specification standard.

[0050] In step S2, if the yield strength σ of the corresponding grade s If it is an interval value, the average of its maximum and minimum values ​​is taken as the average yield strength σ m If the material has been tested, the test strength σ is directly taken. test .

[0051] In step S4, the critical axial force fracture value NRR of the weld material is obtained according to formula (1);

[0052] NRR=λ*σ s-pmin *T comb (1)

[0053] Among them, λ is the empirical coefficient, T comb is the combined thickness of the two components in the welded connection, i.e. T comb=T part1 +T part2 ;

[0054] According to formula (2), the critical shear stress value NRT of the weld is obtained;

[0055] NRT=μ*NRR (2)

[0056] Where μ is the conversion coefficient.

[0057] Example 1

[0058] like Figure 2 FIG. 1 is a diagram showing the specific steps of a method for simulating weld failure based on vehicle crashworthiness in this embodiment, including the following steps:

[0059] Step S1: Obtain the material grades of all components connected by the solder joints;

[0060] In the early stages of vehicle development, the design department will release a complete vehicle bill of materials (BOM) that includes part numbers, thicknesses, and material grades. Based on the released BOM, the material grades of the sheet metal parts required for weld connections are compiled and a statistical table is created.

[0061] Table 1 is the material grade table of the remaining parts required for welding connection of the whole vehicle

[0062] Hierarchy Part Number Chinese name Material specifications Material specification standards 7 5301031-BA01 Front fender LA260 / 350 1 7 5301041-BA01 Front fender lower cross member upper plate C1500HSAS 1.3 7 5301131-BA01 Front panel reinforcement plate LA340 / 420 1.5 7 5301211-BA01 Front dash panel lower cross member lower plate C1500HSAS 1.2 7 5301213-BA01 Left lower panel of front fender St17 1.2 7 5101171-BA01 Front connecting plate of left longitudinal beam of center channel LA300 / 380 1.5 7 5101172-BA01 Front connecting plate of right longitudinal beam of center channel LA300 / 380 1.5 7 5301217-BA01 Spreader bracket LA420 / 590 1.2 7 5301218-BA01 Spreader bracket LA420 / 590 1.2 9 5112161-BA01 Left front longitudinal beam outer panel DP780 1.3 / 1.5 9 5112121BA01 Left front buffer fixing bracket DP780 2.5 10 5301223-BA01 Left front longitudinal beam connecting plate upper plate LA420 / 590 1.2 10 5301221-BA01 Left front longitudinal beam connecting plate lower plate LA420 / 590 1.2 10 5112061-BA01 Left front support outer reinforcement plate-front subframe LA300 / 380 3

[0063] Step S2: Based on the statistical table 2 of vehicle material grades compiled in step S1, and in combination with the corporate standards of each enterprise, the yield strength σ of the corresponding grade is compiled. s , used to solve the subsequent solder joint material parameters;

[0064] Table 2 is a statistical table of material grades used in vehicle models

[0065]

[0066] Taking the enterprise standard provided by the steel mill as an example, the yield strength of the steel foundation (σ s ), tensile strength (σ b ), elongation (ψ), and subsequent solder joint failure simulation mainly adopts yield strength (σ s ) this performance indicator;

[0067] In step S2, if the yield strength σ of the corresponding grade s If it is an interval value, the average of its maximum and minimum values ​​is taken as the average yield strength σ m For example, if the corresponding grade is H140 and the yield strength is 135-205Mpa, then take σ m =(σ smin +σ smax ) / 2, σ of H140m =170Mpa. If the material has been tested, the test strength σ can be directly taken test ;

[0068] Step S3: Filter out the model definition welding connection pairs as shown in 3, and select the lower value of the yield strength in the connection pair as the failure benchmark yield strength σ s-pmin ; Wherein, the connection pair refers to a pair formed by two parts and their welding points that are directly connected in a two-layer or multi-layer connection relationship;

[0069] Table 3 is the welding connection table for vehicle model definition

[0070]

[0071] For example, Figure 3 As shown in (a), the single-layer welding of parts 8402021-QC01 and 8402071-QC01, the two parts and their welding points form a connection pair; Figure 3 As shown in (b), among the three parts 8402021-QC01, 8402071-QC01 and 8402061-QC01, there are two connection pairs directly connected: the connection pair between part 8402021-QC01 and part 8402071-QC01, and the connection pair between part 8402071-QC01 and part 8402061-QC01;

[0072] If the two materials in the connection are H140 and ST280 respectively, the yield strength of H140 σ s is 170Mpa, and the yield strength of ST280 is 350Mpa, then σ s-pmin =170Mpa.

[0073] Step S4: Obtaining the failure force parameters of the solder joint, wherein the failure force parameters of the solder joint include the critical axial force fracture value NRR of the solder joint material and the critical shear force value NRT of the solder joint;

[0074] In step S4, the critical axial force fracture value NRR of the weld material is obtained according to formula (1);

[0075] NRR=λ*σ s-pmin *T comb (1)

[0076] Among them, λ is an empirical coefficient. The range of λ varies according to different metals and different strength grades of the same metal. For aluminum alloy, the range of λ is 8.1 to 8.5; for low-strength steel, it is 9.8 to 11.2; for medium-strength steel, it is 6.8 to 7.5; for high-strength steel, it is 6.5 to 6.8; T comb is the combined thickness of the two components in the welded connection, i.e. Tcomb =T part1 +T part2 ;

[0077] According to formula (2), the critical shear stress value NRT of the weld is obtained;

[0078] NRT=μ*NRR (2)

[0079] Wherein, μ is the conversion coefficient, which ranges from 1.3 to 1.5 in engineering applications;

[0080] If a solder joint connection has two components, one is A and the other is B, the thickness of A is 1.2mm and the thickness of B is 1.5mm, then Tcomb = 2.7mm;

[0081] Step S5: Bring the material parameters and solder joint failure force parameters into the solder joint material MAT100 control card and assign them to the components corresponding to different solder joint groups; the material parameters include material density RO, Young's modulus E, Poisson's ratio PR, and reference yield strength σ s-pmin , tangent modulus ET; uniformly defined as 1000 (for the S2 unit system, that is, length is mm / mm, weight is ton / t, time unit is second / s, and force unit is Newton / N), the weld failure force parameters are NRR, NRS, and NRT; the remaining parameters are not defined.

[0082] An automated script is used to automatically read the thickness, material grade, and yield strength information of the connection centering components through the standard name definition in the part *PART, automatically create the weld point *PART component, and automatically assign values ​​to the corresponding attributes *SECTION and material *MAT, where *MAT is the corresponding parameter definition in MAT100.

[0083] Step S6: Inputting material parameters and weld failure force parameters into finite element analysis software for solution calculation.

[0084] Specifically, the material parameters and weld failure force parameters are input into the Ls-dyna software to conduct a crashworthiness analysis of the entire vehicle, identify weld cracking conditions (delete units), and optimize the weld density, connection plate yield strength grade, and connection plate thickness to achieve risk optimization in key areas of the entire vehicle.

[0085] After solving the problem, the software can be used to directly check the location and number of failed welds, and determine whether the deformation mode of the key assembly is consistent with the design expectations. If the cracking of the welds causes the design to be inconsistent with the expectations (or goals), the layout and number of welds, the thickness of the connecting plates, and the strength of the connecting parts are optimized until the deformation results meet the design expectations (or goals).

[0086] Example 2

[0087] Figure 4 This is a structural diagram of a computer device in Example 2 of the present invention. Figure 4 A block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention is shown. Figure 4 The computer device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0088] like Figure 4 As shown, computer device 12 is implemented as a general-purpose computing device. Components of computer device 12 may include, but are not limited to, one or more processors or processing units 16, system memory 28, and a bus 18 that connects various system components (including system memory 28 and processing unit 16).

[0089] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. Examples of these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0090] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0091] System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. Computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be configured to read and write non-removable, non-volatile magnetic media ( Figure 4 Not shown, often called a "hard drive"). Although Figure 4 Not shown, a magnetic disk drive for reading and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 via one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of various embodiments of the present invention.

[0092] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may include an implementation of a network environment. Program modules 42 generally perform the functions and / or methodologies of the embodiments described herein.

[0093] The computer device 12 can also communicate with one or more external devices 14 (e.g., a keyboard, a pointing device, a display 24, etc.), one or more devices that enable a user to interact with the computer device 12, and / or any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., a network card, a modem, etc.). This communication can be performed via an input / output (I / O) interface 22. In addition, in the computer device 12 of this embodiment, the display 24 is not a separate entity, but is embedded in the mirror surface. When the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface are visually integrated. Furthermore, the computer device 12 can also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 20. As shown in the figure, the network adapter 20 communicates with other modules of the computer device 12 via a bus 18. It should be understood that although not shown in the figures, other hardware and / or software modules may be used in conjunction with the computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0094] The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28 , such as implementing a weld failure simulation method based on vehicle crashworthiness provided by an embodiment of the present invention.

[0095] Example 3

[0096] Embodiment 3 of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, a method for simulating weld failure based on the crashworthiness of a whole vehicle as provided in all the embodiments of the present application is implemented.

[0097] Any combination of one or more computer-readable media can be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device or device.

[0098] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0099] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0100] Computer program code for performing the operations of the present invention may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0101] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for simulating weld failure based on vehicle crashworthiness, characterized in that: The steps include: Step S1: Obtain the material grades of all components connected by the solder joints; Step S2: Based on the statistical table of vehicle material grades compiled in step S1, the yield strength σ of the corresponding grades is compiled in combination with the corporate standards of each enterprise. s , used to solve the subsequent solder joint material parameters; Step S3: Filter out the model-defined welding connection pairs and select the lower value of the yield strength in the connection pair as the benchmark yield strength σ s-pmin ; Wherein, the connection pair refers to a pair formed by two parts and their welding points that are directly connected in a two-layer or multi-layer connection relationship; Step S4: Obtaining the failure force parameters of the solder joint, wherein the failure force parameters of the solder joint include the critical axial force fracture value NRR of the solder joint material and the critical shear force value NRT of the solder joint; Step S5: Bring the material parameters and solder joint failure force parameters into the solder joint material MAT100 control card and assign them to the components corresponding to different solder joint groups; the material parameters include material density RO, Young's modulus E, Poisson's ratio PR, and reference yield strength σ s-pmin , tangent modulus ET; Step S6: Inputting material parameters and weld failure force parameters into finite element analysis software for solution calculation.

2. A method for simulating weld failure based on vehicle crashworthiness as claimed in claim 1, characterized in that: The step S1 specifically involves sorting out the BOM of the entire vehicle, obtaining the material grades used for the welding connectors of the entire vehicle, and establishing a statistical table of material grades used for each vehicle model.

3. The method for simulating weld failure based on vehicle crashworthiness as claimed in claim 2, characterized in that: The parameters of the vehicle model material brand statistics table include level, part number, Chinese name, material specifications and material specification standards.

4. The method for simulating weld failure based on vehicle crashworthiness according to claim 1, wherein: In step S2, if the yield strength σ of the corresponding grade s If it is an interval value, the average of its maximum and minimum values ​​is taken as the average yield strength σ m If the material has been tested, the test strength σ is directly taken. test .

5. The method for simulating weld failure based on vehicle crashworthiness according to claim 1, characterized in that: In step S4, the critical axial force fracture value NRR of the weld material is obtained according to formula (1); NRR=λ*σ s-pmin *T comb (1) Among them, λ is the empirical coefficient, T comb is the combined thickness of the two components in the welded connection, i.e. T comb =T part1 +T part2 .

6. The method for simulating weld failure based on vehicle crashworthiness according to claim 1, characterized in that: In step S4, the critical shear force value NRT of the weld is obtained according to formula (2); NRT=μ*NRR (2) Where μ is the conversion coefficient.

7. The method for simulating weld failure based on vehicle crashworthiness as claimed in claim 1, characterized in that: The material parameters in step S5 include material density RO, Young's modulus E, Poisson's ratio PR, reference yield strength σ s-pmin , tangent modulus ET.

8. A computer device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, a method for simulating weld failure based on the crashworthiness of a whole vehicle as described in any one of claims 1 to 7 is implemented.

9. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the program is executed by a processor, a method for simulating weld failure based on the crashworthiness of a whole vehicle as described in any one of claims 1 to 7 is implemented.

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