CN112464401B - Accurate modeling method for metal material welding spot - Google Patents
Accurate modeling method for metal material welding spot Download PDFInfo
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- CN112464401B CN112464401B CN202011327124.2A CN202011327124A CN112464401B CN 112464401 B CN112464401 B CN 112464401B CN 202011327124 A CN202011327124 A CN 202011327124A CN 112464401 B CN112464401 B CN 112464401B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention provides an accurate modeling method for a metal material welding spot, and belongs to the technical field of vehicle simulation analysis. The invention compares the force and displacement curve of the actual welding spot sample piece with the force and displacement curve of the CAE simulation, adjusts the parameters of the simulation, unifies the curve of the simulation output and the corresponding test curve, obtains the welding spot material parameter model, and improves the accuracy and precision of the simulation analysis result when being used in the whole vehicle simulation analysis model.
Description
Technical Field
The invention relates to the technical field of vehicle simulation analysis, in particular to an accurate modeling method for a metal material welding spot.
Background
In the whole vehicle development process, the performance of the welding point has a remarkable influence on the whole vehicle performance. In the process of developing simulation analysis of the crashworthiness of the whole vehicle structure, mechanical property parameters of different welding points need to be input, and in order to improve simulation precision, the parameters need to be subjected to benchmarking. The accuracy of the targets directly determines the accuracy and precision of simulation analysis results. At present, no clear flow and method exist for the research on the failure simulation of the welding spot in the collision, the value is assigned mainly according to engineering experience, the simulation precision of the welding spot in the collision is difficult to guarantee, and the debugging has certain blindness.
Disclosure of Invention
The invention aims to provide an accurate modeling method of a metal material welding spot, which compares a force and displacement curve of an actual welding spot sample with a CAE simulation force and displacement curve, adjusts simulation parameters, unifies a simulation output curve with a corresponding test curve, obtains a welding spot material parameter model, is used in a whole vehicle simulation analysis model, and improves the accuracy and precision of a simulation analysis result.
In order to achieve the above object, the present invention provides an accurate modeling method for a metal material welding spot, which is characterized by comprising the following steps:
the method comprises the following steps: manufacturing sample pieces of a lap joint tensile test, a butt joint tensile test and a cross tensile test by using a metal material, measuring the thickness of a base material and the size and position of a welding spot, respectively testing from a high-speed tensile testing machine of the material to obtain original force and displacement curves under different working conditions, and executing the second step;
step two, smoothing the high strain rate force and displacement curve obtained in the step one by using an equivalent work-doing method, obtaining the maximum axial force which can be borne by the welding spot through the smoothed cross tensile test force and displacement curve, obtaining the maximum shearing force which can be borne by the welding spot through the smoothed lap tensile test force and displacement curve, obtaining the maximum peeling bending moment and the maximum plane torque through the smoothed butt joint tensile test force and displacement curve, and executing the step four;
step three: and (2) building a CAE simulation analysis model of a welding spot sample by adopting pretreatment simulation analysis software, simulating a solid hexahedral welding spot for the standard, setting the size and the position of the welding spot according TO the actual welding spot state, adopting LS-DYNA as simulation analysis software, and carrying out step four by adopting MAT _ SPOTWELD as a material type MAT _ SPOTWELD and CONTACT CONTACT _ TIED _ NODES _ TO _ SURFACE.
Step four: introducing the maximum axial force, the maximum shearing force, the maximum peeling bending moment and the maximum plane torque which can be borne by the welding spot obtained in the step two into a failure simulation model, carrying out simulation calculation to obtain simulated welding spot force displacement curves under different working conditions, and executing a step five;
step five: comparing the simulated welding spot force displacement curves of different working conditions obtained in the step four with the maximum force value of the actual welding spot force displacement curve of the corresponding working condition obtained in the step two respectively for consistency, if not, executing the step six, and if so, executing the step seven;
step six: and correspondingly adjusting the calibration result according to different working conditions, if the maximum cross stretching force value is inconsistent, adjusting the maximum axial force parameter input into the failure simulation model in the step four, and the other working conditions are the same. After adjustment, carrying out simulation calculation again to obtain a simulated welding spot force displacement curve, executing the step five until the simulated welding spot force displacement curve of each working condition is consistent with the maximum force value of the actual welding spot force displacement curve, and executing the step seven;
step seven: storing the parameter model of the welding spot material, and executing the step eight;
step eight: inputting the parameters of the welding spot materials obtained in the seventh step into a whole vehicle model, and carrying out whole vehicle analysis.
The accurate modeling method of the metal material welding spot has the following advantages:
the data processing method is simple in process and easy to master, and can be easily realized by using a relatively basic data processing tool.
The equivalent acting method for smoothing the high strain rate curve ensures the authenticity of the data to a great extent, reduces distortion and improves the accuracy of the data.
The input parameters in the simulation analysis method are directly obtained by tests, so that the effectiveness and the authenticity of a data curve are further ensured, and finally the data precision and the simulation precision are improved.
The data processing method can be carried out according to welding mechanical property data of different material combinations, and can meet the requirement of simulation precision within a certain thickness range.
The database precision improving method can be carried out aiming at models with different modeling parameters, the obtained dynamic mechanical property curve can better meet the CAE simulation analysis requirement, and the method is simple in process, clear in purpose and high in engineering realizability.
Drawings
FIG. 1 is a schematic view of a force displacement curve;
FIG. 2 is a simulation analysis model of a docking test;
FIG. 3 is a lap joint simulation test model;
FIG. 4 is a cross tensile test simulation analysis model;
FIG. 5 is a schematic diagram showing a comparison between a simulated welding spot force displacement curve and an actual welding spot force displacement curve;
FIG. 6 is a flow chart of a precise modeling method of the present invention.
Detailed Description
The specific implementation mode of the invention provides an accurate modeling method of a metal material welding spot. Because the welding spot is as the important constitution of connecting the sheet metal component, along with the deformation of sheet metal component in the collision, what the welding spot received is not the effect of single load, but a compound load. The force-based welding spot failure judgment needs to decompose the composite stress mode of a single welding spot into a tensile force, a shearing force, a peeling bending moment and a plane torque, and respectively carries out simulation analysis and calibration. As shown in fig. 6, the method for accurately modeling a metal material welding spot of the present invention includes the following steps:
the method comprises the following steps: manufacturing a lap joint tensile test sample, a butt joint tensile test sample and a cross tensile test sample by using a metal material, measuring the thickness of a base material and the size and the position of a welding point, respectively testing from a high-speed material tensile testing machine to obtain original force and displacement curves under different working conditions, and executing a second step as shown in figure 1;
and step two, smoothing the high strain rate force and displacement curve obtained in the step one under different working conditions by using an equivalent power doing method, wherein the welding mechanical property curve under a higher tensile rate fluctuates, and the maximum failure rate cannot be easily judged by directly intercepting the effective section, so that the curve needs to be smoothed. And (3) smoothing the high strain rate curve by adopting an equivalent acting method: the principle is that the work of the sample is equal by the outside in the test process, so that the wave crest and the wave trough can be mutually offset in the jittering curve, and the area enclosed by the force and the displacement is equal. The method ensures the accuracy of the data to a great extent and has small distortion.
Obtaining the maximum axial force which can be borne by the welding spot through the smoothed cross tensile test force and the displacement curve, obtaining the maximum shearing force which can be borne by the welding spot through the smoothed lap tensile test force and the displacement curve, obtaining the maximum peeling bending moment and the maximum plane torque through the smoothed butt tensile test force and the displacement curve, and executing the step four;
step three: adopting pretreatment simulation analysis software, building a welding spot sample CAE simulation analysis model, simulating a solid hexahedral welding spot for a standard, setting the size and the position of the welding spot according TO the actual welding spot state, adopting LS-DYNA as simulation analysis software and controlling _ TIED _ NODES _ TO _ SURFACace as a CONTACT according TO the material type MAT _ SPOTWELD and executing the step four, wherein the simulation analysis model is shown in figures 2 TO 4.
Step four: introducing the maximum axial force, the maximum shearing force, the maximum peeling bending moment and the maximum plane torque which can be borne by the welding spot obtained in the step two into a failure simulation model, carrying out simulation calculation to obtain simulated welding spot force displacement curves under different working conditions, and executing a step five;
step five: comparing the consistency of the simulated welding spot force displacement curves of different working conditions obtained in the fourth step with the maximum force value of the actual welding spot force displacement curve of the corresponding working condition obtained in the second step, and executing a sixth step if the simulated welding spot force displacement curves of different working conditions are not consistent with the maximum force value of the actual welding spot force displacement curve of the corresponding working condition obtained in the second step as shown in figure 5;
step six: and correspondingly adjusting the calibration result according to different working conditions, if the maximum cross tension force value is inconsistent, adjusting the maximum axial force parameter input into the failure simulation model in the step four, and the other working conditions are the same. After adjustment, carrying out simulation calculation again to obtain a simulated welding spot force displacement curve, executing the step five until the simulated welding spot force displacement curve of each working condition is consistent with the maximum force value of the actual welding spot force displacement curve, and executing the step seven;
step seven: storing the parameter model of the welding spot material, and executing the step eight;
step eight: inputting the parameters of the welding spot materials obtained in the seventh step into a whole vehicle model, and carrying out whole vehicle analysis. The database precision improving method can be carried out aiming at models with different modeling parameters, and the obtained dynamic mechanical property curve can better meet the CAE simulation analysis requirements so as to obtain the high-precision welding spot modeling method suitable for modeling conditions such as different grid parameters and unit systems.
Claims (1)
1. An accurate modeling method for a metal material welding spot is characterized by comprising the following steps:
the method comprises the following steps: manufacturing sample pieces of a lap joint tensile test, a butt joint tensile test and a cross tensile test by using a metal material, measuring the thickness of a base material and the size and position of a welding spot, respectively testing from a high-speed tensile testing machine of the material to obtain original force and displacement curves under different working conditions, and executing the second step;
step two, smoothing the high strain rate force and displacement curve obtained in the step one by using an equivalent work-doing method, obtaining the maximum axial force which can be borne by the welding spot through the smoothed cross tensile test force and displacement curve, obtaining the maximum shearing force which can be borne by the welding spot through the smoothed lap tensile test force and displacement curve, obtaining the maximum peeling bending moment and the maximum plane torque through the smoothed butt joint tensile test force and displacement curve, and executing the step four;
step three: adopting pretreatment simulation analysis software, building a CAE simulation analysis model of a welding spot sample piece, simulating a solid hexahedral welding spot for a target, setting the size and the position of the welding spot according TO the actual welding spot state, adopting LS-DYNA as simulation analysis software, and contacting with CONTACT _ TIED _ NODES _ TO _ SURFACE according TO the material type MAT _ SPOTWELD, and executing the fourth step;
step four: introducing the maximum axial force, the maximum shearing force, the maximum peeling bending moment and the maximum plane torque which can be borne by the welding spot obtained in the step two into a failure simulation model, carrying out simulation calculation to obtain simulated welding spot force displacement curves under different working conditions, and executing the step five;
step five: comparing the simulated welding spot force displacement curves of different working conditions obtained in the step four with the maximum force value of the actual welding spot force displacement curve of the corresponding working condition obtained in the step two respectively for consistency, if not, executing the step six, and if so, executing the step seven;
step six: correspondingly adjusting the calibration results according to different working conditions, if the maximum cross stretching force values are inconsistent, adjusting the maximum axial force parameter input into the failure simulation model in the step four, and if the other working conditions are the same, performing simulation calculation again after adjustment to obtain a simulated welding spot force displacement curve, executing the step five until the simulated welding spot force displacement curve of each working condition is consistent with the maximum force value of the actual welding spot force displacement curve, and executing the step seven;
step seven: storing the parameter model of the welding spot material, and executing the step eight;
step eight: and (4) inputting the welding spot material parameters obtained in the step seven into a whole vehicle model, and carrying out whole vehicle analysis.
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| CN113435030A (en) * | 2021-06-23 | 2021-09-24 | 重庆长安汽车股份有限公司 | Simulation analysis method for failure of welding spot |
| CN113434963B (en) * | 2021-07-22 | 2022-08-09 | 中国第一汽车股份有限公司 | Welding spot failure parameter determination method and device, electronic equipment and storage medium |
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