CN116933391B - Stamping information correction method and system for whole vehicle fine collision simulation - Google Patents
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Abstract
The invention relates to the technical field of collision simulation, and provides a stamping information correction method and a stamping information correction system for fine collision simulation of a whole vehicle, wherein the method comprises the following steps: program simulation analysis is carried out on the stamping part model by constructing a stamping simulation grid model, stamping information is obtained, and the stamping information comprises stress information and strain state information; checking a cracking failure finite element in the stamping simulation grid model through a forming limit curve according to the acquired stamping information; obtaining a strain pair after the crack failure finite element correction by linearly correcting the strain pair coordinate points of the crack failure finite element to a forming limit curve; calculating the thickness of the corrected unit of the cracking failure finite unit according to the initial thickness of the cracking failure finite unit and the corrected strain pair; and introducing the strain pair corrected by the cracking failure finite element and the corrected element thickness into the whole vehicle fine collision simulation through mapping. The invention is beneficial to improving the precision of the whole car collision simulation.
Description
Technical Field
The invention relates to the technical field of collision simulation, in particular to a stamping information correction method and system for fine collision simulation of a whole vehicle.
Background
With the rapid development of the automobile industry in recent years, the requirements of people on the performance quality of automobile products, particularly the collision safety performance, are increasing. The development of the collision safety performance of automobiles has become an indispensable key link in the design and development process. Before a real-vehicle collision test in a vehicle trial production stage, a virtual collision safety test based on a CAE simulation technology bears an important task of evaluating safety performance, so that optimization iteration of a design scheme can be rapidly and low-cost carried out, and the research and development period is effectively shortened. The vehicle body structure generates rapid large displacement and large deformation under the action of transient impact force in the collision process of the vehicle, which is a complex mechanical problem related to multiple nonlinearities such as geometric nonlinearity, material nonlinearity, boundary nonlinearity and the like. The method for improving the safety simulation precision of the CAE whole car collision and deeply researching the elastoplasticity of the car structure and the change rules of related deformation, energy, speed, acceleration and impact force in the collision process is always the focus of attention of the current CAE simulation technology application.
The conventional method of CAE collision analysis in the past is to directly adopt design values of part plate thickness and material performance to carry out simulation calculation after CAE grid modeling is completed according to a geometric design model, and does not consider the difference between an ideal model and the actual state of the part, so that deviation of simulation precision and even distortion of calculation results are often caused. In order to make up for the lack of precision of the conventional method, a method for finer modeling has been started to be applied to CAE whole car fine collision simulation. According to the method, the influence factors of the stamping effect are considered, the forming simulation result (namely the thickness and the strain information after forming) of the stamped part is introduced into the collision simulation model through a grid mapping algorithm, and the accuracy of the whole car collision simulation can be improved theoretically. It is worth mentioning that the purpose of the whole car crash simulation is to make the simulation prediction in the early design stage fit the real car crash test result in the later trial production stage to the greatest extent. Clearly, the part real object for real vehicle manufacturing in the trial production stage eliminates the defects of stamping forming cracking through multi-wheel design optimization, but the design defects are often still in the design digital-analog used for simulation in the early design stage and are not solved yet. Once the part forming simulation result with cracking defects is introduced into the collision simulation model, the precision of the whole vehicle collision simulation cannot be improved, and the calculation result is possibly and reversely seriously distorted, namely 'milli-centimeter out of the heart'. The stamping information for the fine crash simulation of the entire vehicle must therefore be checked and corrected for stamping formability in order to be used correctly. However, no stamping information correction method disclosed at present can be used for fine collision simulation of the whole vehicle.
Therefore, how to provide an efficient and accurate stamping information correction method is a technical problem to be solved.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and a system for correcting stamping information for fine collision simulation of a whole vehicle, in order to overcome the defects of the prior art.
According to a first aspect of the present invention, there is provided a punching information correction method for whole vehicle fine collision simulation, comprising:
program simulation analysis is carried out on the stamping part model by constructing a stamping simulation grid model, stamping information is obtained, and the stamping information comprises stress information and strain state information;
checking a cracking failure finite element in the stamping simulation grid model through a forming limit curve according to the acquired stamping information;
obtaining a strain pair after the crack failure finite element correction by linearly correcting the strain pair coordinate points of the crack failure finite element to a forming limit curve;
calculating the thickness of the corrected unit of the cracking failure finite unit according to the initial thickness of the cracking failure finite unit and the corrected strain pair;
and introducing the strain pair corrected by the cracking failure finite element and the corrected element thickness into the whole vehicle fine collision simulation through mapping.
Preferably, in the stamping information correction method for fine collision simulation of the whole vehicle, the method for correcting stamping information by constructing a stamping simulation grid model, performing program simulation analysis on a stamping part model, and acquiring stamping information comprises the following steps: and carrying out finite element mesh division on the stamping part model to obtain a stamping simulation mesh model, and obtaining stamping information through forming simulation analysis on the stamping simulation mesh model.
Preferably, in the stamping information correction method for fine collision simulation of the whole vehicle, according to the obtained stamping information, the cracking failure finite element in the stamping simulation grid model is checked through a forming limit curve, and the method comprises the following steps:
establishing a corresponding forming limit curve according to the material and forming attribute of the stamping model part, wherein the ordinate of the forming limit curve is a main strain value, and the abscissa of the forming limit curve is a secondary strain value;
taking a main strain value of a finite element in a stamping simulation grid model as an ordinate, taking a secondary strain value of the finite element as an abscissa, and constructing a strain pair coordinate point of the finite element in a forming limit curve coordinate system;
and judging the finite element with the strain pair coordinate point above the forming limit curve as cracking failure.
Preferably, in the stamping information correction method for fine collision simulation of a whole vehicle, the method for obtaining the corrected strain pair of the cracking failure finite element by linearly correcting the strain pair coordinate point of the cracking failure finite element to a forming limit curve comprises the following steps:
in a forming limit curve coordinate system, connecting a strain pair coordinate point of a cracking failure finite element with an origin of the coordinate system to construct a first line segment;
and taking the intersection point of the first line segment and the forming limit curve as a correction strain pair coordinate point of the cracking failure finite element.
Preferably, in the stamping information correction method for fine collision simulation of a whole vehicle, the strain pair corrected by the cracking failure finite element is obtained by linearly correcting the strain pair coordinate point of the cracking failure finite element to a forming limit curve, and the method further comprises the following steps: and calculating the strain correction coefficient of the cracking finite element according to the strain pairs before and after the cracking finite element is corrected, and correcting the strain component of the cracking finite element by adopting the strain correction coefficient.
Preferably, in the stamping information correction method for fine collision simulation of the whole vehicle, the method calculates the strain correction coefficient of the cracking finite element according to the strain pair before and after the cracking finite element is corrected, corrects the strain component of the cracking finite element by adopting the strain correction coefficient, and comprises the following steps:
connecting the coordinate points of the correction strain pair with the origin of the coordinate system to construct a second line segment;
taking the ratio of the length of the first line segment to the length of the second line segment as the strain correction coefficient of the cracking failure finite element;
and taking the product of the strain component of the cracking failure finite element and the strain correction coefficient as the corrected strain component.
Preferably, in the stamping information correction method for fine collision simulation of the whole vehicle, according to the initial thickness and the corrected strain pair of the cracking failure finite element, the corrected element thickness of the cracking failure finite element is calculated according to the following formula:
wherein T is the thickness of the unit after the cracking failure finite unit is corrected, T 0 To crack the initial thickness of the failed finite element prior to presentation,main strain corrected for cracking failure finite element, < ->And (5) correcting the secondary strain for cracking the failure finite element.
Preferably, in the stamping information correction method for fine collision simulation of the whole vehicle, the strain pair corrected by the cracking failure finite element and the corrected element thickness are introduced into the fine collision simulation of the whole vehicle through mapping, and the stamping information correction method comprises the following steps: according to the mapping relation between the stamping simulation grid model and the collision simulation grid model, the stamping information after stamping part correction is introduced into the collision simulation grid model for fine collision simulation of the whole vehicle, and the stamping information after stamping part correction comprises strain pairs and unit thicknesses of all finite units of the stamping part after correction.
According to a second aspect of the present invention, there is provided a punching information correction system for fine collision simulation of a whole vehicle, comprising a correction server for performing program simulation analysis on a punching part model by constructing a punching simulation grid model, obtaining punching information including stress information and strain state information; checking a limited unit of cracking failure in the stamping simulation grid model through a forming limit curve according to the acquired stamping information; obtaining a strain pair after the crack failure finite element correction by linearly correcting the strain pair coordinate points of the crack failure finite element to a forming limit curve; calculating the thickness of the corrected unit of the cracking failure finite unit according to the initial thickness of the cracking failure finite unit and the corrected strain pair; and introducing the strain pair corrected by the cracking failure finite element and the corrected element thickness into the whole vehicle fine collision simulation through mapping.
According to a third aspect of the present invention there is provided a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of the first aspect of the present invention when executing the program.
The stamping information correction method and system for the whole-vehicle fine collision simulation, disclosed by the invention, utilize the forming limit curve to check and find the limited unit with cracking failure, correct the stamping information obtained by forming simulation, ensure that the part forming simulation result for the whole-vehicle fine collision simulation has no cracking defect, truly simulate the fact that the part real object of the collision test vehicle has no cracking defect, be beneficial to the fine modeling of the whole-vehicle fine collision simulation, promote the precision of the whole-vehicle collision simulation, and effectively avoid the defect of distortion of the result of the whole-vehicle collision simulation caused by the introduction of the stamping information with forming cracking.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system for a stamping information correction method for whole vehicle fine collision simulation, suitable for use in embodiments of the present application;
FIG. 2 is a flowchart of steps of a stamping information correction method for fine crash simulation of a whole vehicle according to an embodiment of the present invention;
FIG. 3 is a diagram showing an example of a stamped simulation grid model subjected to finite element meshing obtained by the method according to the present embodiment;
FIG. 4 illustrates an exemplary diagram of correction of a fracture failure finite element in one scenario according to the method of the present embodiment;
FIG. 5 illustrates strain pair locations corresponding to finite elements in the application scenario illustrated in FIG. 4;
FIG. 6 illustrates the corrected strain versus position for the finite element shown in FIG. 5;
FIG. 7 illustrates another embodiment of a stamping information correction method for whole vehicle fine collision simulation of the present invention;
fig. 8 is a schematic structural diagram of the apparatus provided by the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be noted that, without conflict, the following embodiments and features in the embodiments may be combined with each other; and, based on the embodiments in this disclosure, all other embodiments that may be made by one of ordinary skill in the art without inventive effort are within the scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
Fig. 1 illustrates an exemplary system for a stamping information correction method for whole vehicle fine collision simulation, which is suitable for use in embodiments of the present application. As shown in fig. 1, the system may include a rework server 101, a communication network 102, and/or one or more rework clients 103, which are illustrated in fig. 1 as a plurality of rework clients 103.
The revision server 101 may be any suitable server for storing information, data, programs, and/or any other suitable type of content. In some embodiments, correction server 101 may perform appropriate functions. For example, in some embodiments, correction service 101 may be used to correct the stamping information of the stamped part. As an alternative example, in some embodiments, the correction service 101 may be used to implement correction of the stamped part stamping information by obtaining strain pairs corrected by the fracture failure finite element. For example, the correction server 101 may be configured to perform program simulation analysis on the stamped part model by constructing a stamped simulation grid model, to obtain stamped information, where the stamped information includes stress information and strain state information; checking a limited unit of cracking failure in the stamping simulation grid model through a forming limit curve according to the acquired stamping information; obtaining a strain pair after the crack failure finite element correction by linearly correcting the strain pair coordinate points of the crack failure finite element to a forming limit curve; calculating the thickness of the corrected unit of the cracking failure finite unit according to the initial thickness of the cracking failure finite unit and the corrected strain pair; and introducing the strain pair corrected by the cracking failure finite element and the corrected element thickness into the whole vehicle fine collision simulation through mapping.
As another example, in some embodiments, the correction server 101 may send the stamping information correction method for the whole vehicle fine collision simulation to the correction client 103 for use by the user according to the request of the correction client 103.
As an alternative example, in some embodiments, the modification client 103 is configured to provide a visual modification interface, where the visual modification interface is configured to receive a selection input operation for modifying the stamping information by the user, and, in response to the selection input operation, obtain, from the modification server 101, a modification interface corresponding to an option selected by the selection input operation and display the modification interface, where at least information for modifying the stamping information of the stamped part and an operation option for modifying the information of the stamping information of the stamped part are displayed.
In some embodiments, communication network 102 may be any suitable combination of one or more wired and/or wireless networks. For example, the communication network 102 can include any one or more of the following: the internet, an intranet, a Wide Area Network (WAN), a Local Area Network (LAN), a wireless network, a Digital Subscriber Line (DSL) network, a frame relay network, an Asynchronous Transfer Mode (ATM) network, a Virtual Private Network (VPN), and/or any other suitable communication network. Correction client 103 can be coupled to communication network 102 via one or more communication links (e.g., communication link 104), and communication network 102 can be linked to correction server 101 via one or more communication links (e.g., communication link 105). The communication link may be any communication link suitable for transferring data between rework client 103 and rework server 101, such as a network link, dial-up link, wireless link, hard-wired link, any other suitable communication link, or any suitable combination of such links.
The rework client 103 may include any one or more clients that present, in a suitable form, interfaces related to the rework stamped part's stamping information for use and operation by a user. In some embodiments, rework client 103 may include any suitable type of device. For example, in some embodiments, rework client 103 may include a mobile device, a tablet computer, a laptop computer, a desktop computer, and/or any other suitable type of client device.
Although revision server 101 is illustrated as one device, in some embodiments any suitable number of devices may be used to perform the functions performed by revision server 101. For example, in some embodiments, multiple devices may be used to implement the functions performed by rework server 101. Alternatively, the functions of the correction service terminal 101 may be implemented using a cloud service.
Based on the above system, the embodiment of the application provides a stamping information correction method for fine collision simulation of a whole vehicle, and the following embodiment is used for illustration.
Referring to fig. 2, a flowchart of steps of a stamping information correction method for fine crash simulation of a whole vehicle according to an embodiment of the present application is shown.
The stamping information correction method for the whole-vehicle fine collision simulation of the embodiment can be executed at a correction server, and comprises the following steps:
step S201: and performing program simulation analysis on the stamping part model by constructing a stamping simulation grid model to acquire stamping information, wherein the stamping information comprises stress information and strain state information.
As an example, the present embodiment obtains a stamped simulation mesh model by performing finite element mesh division on a stamped part model, and obtains stamped information by performing a shape simulation analysis on the stamped simulation mesh model. According to the method of the embodiment, a person skilled in the art can select corresponding analysis and processing software of the stamping parts to perform finite element mesh division on different stamping part models, including but not limited to analysis and processing software such as AUTOFORM or DYNAFORM, and obtain stamping information through shaping and simulation analysis on the stamping simulation mesh model after the stamping simulation mesh model is obtained. The man skilled in the art can carry out the simulation analysis of the stamping simulation grid model by using simulation analysis including but not limited to a one-step method or an incremental method, which is not limited by the method of the embodiment. Fig. 3 shows an exemplary diagram of a stamped simulation mesh model subjected to finite element mesh division obtained by the method according to the present embodiment.
Step S202: and checking the fracture failure finite element in the stamping simulation grid model through a forming limit curve according to the acquired stamping information.
As an example, the method of the present embodiment establishes a corresponding Forming Limit Curve (FLC) according to the material and forming properties of the stamping model part, wherein the ordinate of the forming limit curve is a primary strain value, and the abscissa of the forming limit curve is a secondary strain value. After a forming limit curve is established, in the embodiment, a main strain value of a finite element in a stamping simulation grid model is taken as an ordinate, a secondary strain value of the finite element is taken as an abscissa, and strain pair coordinate points of the finite element are established in a forming limit curve coordinate system; and judging the finite element with the strain pair coordinate point above the forming limit curve as cracking failure.
In the method of the embodiment, the strain log values of the main strain and the secondary strain of the finite element determine whether the finite element is cracked and failed. If the strain pairs of all the units of the stamped part are located below the forming limit curve, the state of the stamped part is determined to be safe, and if the strain pairs of the finite units of a certain part of the stamped part are located above the forming limit curve, the part of the stamped part is considered to be cracked, and the state of the stamped part is determined to be unsafe.
Step S203: and linearly correcting the strain pair coordinate points of the cracking failure finite element to a forming limit curve to obtain the strain pair corrected by the cracking failure finite element.
As an example, in the forming limit curve coordinate system, the method of the embodiment links the strain pair coordinate point of the cracking failure finite element with the origin of the coordinate system to construct a first line segment; and taking the intersection point of the first line segment and the forming limit curve as a correction strain pair coordinate point of the cracking failure finite element.
Fig. 4 shows an exemplary diagram of the correction of the fracture failure finite element in one scenario according to the method of the present embodiment. As shown in FIG. 4, the strain pair (. Epsilon.) at point A of the stamped part 2 ，ε 1 ) Above the forming limit curve, cracking failure occurs at the finite element for which the strain pair corresponds. The strain pair of the finite element needs to be corrected. The method of the embodiment adopts a linear correction method to correct the strain pair. Specifically, in the coordinate system of fig. 4, the point a and the origin O of the coordinate system are connected to construct a line segment OA, and the intersection point of the line segment OA and the forming limit curve is definedAnd a corrected strain coordinate point as a crack failure finite element.
Fig. 5 shows strain pair positions corresponding to 12 finite elements in the application scenario shown in fig. 4, as shown in fig. 5, the strain pairs of 6 finite elements in the coordinate system are located above the forming limit curve, and the coordinate values thereof are shown in table 1 respectively:
TABLE 1
| ε 2 | ε 1 |
| 0.028793 | 0.205766 |
| 0.039916 | 0.226748 |
| 0.059834 | 0.233135 |
| 0.058967 | 0.21901 |
| 0.087282 | 0.239717 |
| 0.100803 | 0.249268 |
The method according to the present embodiment corrects the strain pairs of the 6 finite elements, the corrected strain pair positions are shown in fig. 6, and the corrected strain pair coordinate values are shown in table 2:
TABLE 2
In order to further and sufficiently correct the stamping information of the stamped part, after the strain pair after the correction of the cracking failure finite element is obtained, the embodiment also needs to calculate the strain correction coefficient of the cracking failure finite element according to the strain pair before and after the correction of the cracking failure finite element, and correct the strain component of the cracking failure finite element by adopting the strain correction coefficient. The strain component corresponds to the coordinate system, and the strain component includes positive strain and shear strain. When the shear strain is 0, there are 3 positive strains, the largest value is the primary strain, the secondary strain, and the smallest value is the smallest positive strain.
As an example, the present embodiment method calculates the strain correction coefficient of the cracking finite element as follows: connecting the coordinate points of the correction strain pair with the origin of the coordinate system to construct a second line segment; and taking the ratio of the length of the first line segment to the length of the second line segment as the strain correction coefficient of the cracking failure finite element.
For example, in the scenario shown in fig. 4, according to the method of the present embodiment, the strain correction coefficient β of the cracking failure finite element is calculated as follows:
wherein beta is the strain correction coefficient of the cracking failure finite element, epsilon 1 、ε 2 The primary strain and the secondary strain of the fracture failure finite element respectively,and the main strain and the secondary strain after the cracking failure finite element are corrected respectively.
After the strain correction coefficient of the cracking failure finite element is obtained through calculation, the method of the embodiment takes the product of the strain component of the cracking failure finite element and the strain correction coefficient as the corrected strain component.
Step S204: and calculating the corrected unit thickness of the cracking failure finite unit according to the initial thickness of the cracking failure finite unit and the corrected strain pair.
As an example, the method of the present embodiment calculates the corrected cell thickness of the fracture failure finite cell according to the following formula based on the initial thickness of the fracture failure finite cell and the corrected strain pair.
Wherein T is the thickness of the unit after the cracking failure finite unit is corrected, T 0 To crack the initial thickness of the failed finite element prior to presentation,main strain corrected for cracking failure finite element, < ->And (5) correcting the secondary strain for cracking the failure finite element.
Step S205: and introducing the strain pair corrected by the cracking failure finite element and the corrected element thickness into the whole vehicle fine collision simulation through mapping.
As an example, the method of the embodiment introduces the stamping information after the stamping part correction into the collision simulation grid model for fine collision simulation of the whole vehicle according to the mapping relation between the stamping simulation grid model and the collision simulation grid model, wherein the stamping information after the stamping part correction comprises the strain pairs and the cell thicknesses of all the finite cells of the stamping part after the correction. In practical application, a person skilled in the art can use a corresponding mapping method such as a three-point mapping method to introduce the stamping information after the stamping part is corrected into a collision simulation grid model for fine collision simulation of the whole vehicle, and the embodiment does not limit the method.
In practical application, the invention can also introduce the stamping information of the stamping part into the collision simulation grid model, and then correct the stamping information of the stamping part in the collision simulation grid model.
Fig. 7 shows another embodiment of the stamping information correction method for fine crash simulation of the whole vehicle of the present invention, as shown in fig. 7, the present embodiment is implemented as follows:
program simulation analysis is carried out on the stamping part model by constructing a stamping simulation grid model, stamping information is obtained, and the stamping information comprises stress information and strain state information;
according to the mapping relation between the stamping simulation grid model and the collision simulation grid model, stamping information of the stamped part is introduced into the collision simulation grid model;
checking a cracking failure finite element in the collision simulation grid model through a forming limit curve according to the acquired stamping information;
obtaining a strain pair after the crack failure finite element correction by linearly correcting the strain pair coordinate points of the crack failure finite element to a forming limit curve;
calculating the thickness of the corrected unit of the cracking failure finite unit according to the initial thickness of the cracking failure finite unit and the corrected strain pair;
and obtaining the collision simulation grid model corrected by the stamping information.
The stamping information correction method for the whole-vehicle fine collision simulation utilizes the forming limit curve to check and find the limited unit with cracking failure, corrects the stamping information obtained by the forming simulation, ensures that the part forming simulation result for the whole-vehicle fine collision simulation has no cracking defect, truly simulates the fact that the part real object of the collision test vehicle has no cracking defect, is beneficial to the fine modeling of the whole-vehicle fine collision simulation, improves the precision of the whole-vehicle collision simulation, and can effectively avoid the defect of result distortion of the whole-vehicle collision simulation caused by the introduction of the stamping information with forming cracking.
As shown in FIG. 8, the present invention also provides an apparatus comprising a processor 310, a communication interface 320, a memory 330 for storing a processor executable computer program, and a communication bus 340. Wherein the processor 310, the communication interface 320 and the memory 330 perform communication with each other through the communication bus 340. The processor 310 implements the above-described stamping information correction method for the fine crash simulation of the whole vehicle by running an executable computer program.
The computer program in the memory 330 may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a separate product. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The system embodiments described above are merely illustrative, in which elements illustrated as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected based on actual needs to achieve the purpose of the embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the various embodiments or methods of some parts of the embodiments.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (9)
1. The stamping information correction method for the whole vehicle fine collision simulation is characterized by comprising the following steps of:
program simulation analysis is carried out on the stamping part model by constructing a stamping simulation grid model, stamping information is obtained, and the stamping information comprises stress information and strain state information;
checking a cracking failure finite element in the stamping simulation grid model through a forming limit curve according to the acquired stamping information;
obtaining a strain pair after the crack failure finite element correction by linearly correcting the strain pair coordinate points of the crack failure finite element to a forming limit curve;
calculating the thickness of the corrected unit of the cracking failure finite unit according to the initial thickness of the cracking failure finite unit and the corrected strain pair;
introducing the strain pair corrected by the cracking failure finite element and the corrected element thickness into the whole vehicle fine collision simulation through mapping;
the method for obtaining the strain pair after the correction of the cracking failure finite element comprises the following steps of:
in a forming limit curve coordinate system, connecting a strain pair coordinate point of a cracking failure finite element with an origin of the coordinate system to construct a first line segment;
and taking the intersection point of the first line segment and the forming limit curve as a correction strain pair coordinate point of the cracking failure finite element.
2. The method for correcting punching information for fine crash simulation of a whole vehicle according to claim 1, wherein the step of performing program simulation analysis on the punched part model by constructing a punching simulation grid model to obtain punching information comprises: and carrying out finite element mesh division on the stamping part model to obtain a stamping simulation mesh model, and obtaining stamping information through forming simulation analysis on the stamping simulation mesh model.
3. The method for correcting stamping information for fine crash simulation of a whole vehicle according to claim 1, wherein the step of checking the fracture failure finite element in the stamping simulation grid model by a forming limit curve based on the acquired stamping information comprises:
establishing a corresponding forming limit curve according to the material and forming attribute of the stamping model part, wherein the ordinate of the forming limit curve is a main strain value, and the abscissa of the forming limit curve is a secondary strain value;
taking a main strain value of a finite element in a stamping simulation grid model as an ordinate, taking a secondary strain value of the finite element as an abscissa, and constructing a strain pair coordinate point of the finite element in a forming limit curve coordinate system;
and judging the finite element with the strain pair coordinate point above the forming limit curve as cracking failure.
4. The stamping information correction method for fine crash simulation of a whole vehicle according to claim 1, wherein the obtaining of the strain pair after the correction of the fracture failure finite element by linearly correcting the strain pair coordinate point of the fracture failure finite element onto the forming limit curve, further comprises: and calculating the strain correction coefficient of the cracking finite element according to the strain pairs before and after the cracking finite element is corrected, and correcting the strain component of the cracking finite element by adopting the strain correction coefficient.
5. The stamping information correction method for fine crash simulation of a whole vehicle according to claim 4, wherein calculating a strain correction coefficient of the fracture finite element according to strain pairs before and after correction of the fracture finite element, correcting a strain component of the fracture finite element by using the strain correction coefficient, comprises:
connecting the coordinate points of the correction strain pair with the origin of the coordinate system to construct a second line segment;
taking the ratio of the length of the first line segment to the length of the second line segment as the strain correction coefficient of the cracking failure finite element;
and taking the product of the strain component of the cracking failure finite element and the strain correction coefficient as the corrected strain component.
6. The stamping information correction method for fine crash simulation of a whole vehicle according to claim 1, wherein the corrected cell thickness of the crack failure finite cell is calculated according to the following formula from the initial thickness of the crack failure finite cell and the corrected strain pair:
，
in the method, in the process of the invention,Tcell thickness after correction for cracking failure finite cells,T 0 epsilon for initial thickness before presentation of the fracture failure finite element 1 * Epsilon for the principal strain after modification of the fracture failure finite element 2 * And (5) correcting the secondary strain for cracking the failure finite element.
7. The stamping information correction method for whole vehicle fine collision simulation according to claim 1, wherein the pair of strain after the fracture failure finite element correction and the corrected element thickness are introduced into the whole vehicle fine collision simulation by mapping, comprising: according to the mapping relation between the stamping simulation grid model and the collision simulation grid model, the stamping information after stamping part correction is introduced into the collision simulation grid model for fine collision simulation of the whole vehicle, and the stamping information after stamping part correction comprises strain pairs and unit thicknesses of all finite units of the stamping part after correction.
8. The system comprises a correction server, a correction server and a correction server, wherein the correction server is used for performing program simulation analysis on a stamping part model by constructing a stamping simulation grid model to obtain stamping information, and the stamping information comprises stress information and strain state information; checking a limited unit of cracking failure in the stamping simulation grid model through a forming limit curve according to the acquired stamping information; obtaining a strain pair after the crack failure finite element correction by linearly correcting the strain pair coordinate points of the crack failure finite element to a forming limit curve; calculating the thickness of the corrected unit of the cracking failure finite unit according to the initial thickness of the cracking failure finite unit and the corrected strain pair; introducing the strain pair corrected by the cracking failure finite element and the corrected element thickness into the whole vehicle fine collision simulation through mapping; the method for obtaining the strain pair after the correction of the cracking failure finite element comprises the following steps of: in a forming limit curve coordinate system, connecting a strain pair coordinate point of a cracking failure finite element with an origin of the coordinate system to construct a first line segment; and taking the intersection point of the first line segment and the forming limit curve as a correction strain pair coordinate point of the cracking failure finite element.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method according to any one of claims 1-7 when the program is executed.
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