CN115985426A - CAE (computer aided engineering) analysis method for strength of automobile auxiliary instrument panel handrail assembly - Google Patents
CAE (computer aided engineering) analysis method for strength of automobile auxiliary instrument panel handrail assembly Download PDFInfo
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- CN115985426A CN115985426A CN202310000175.1A CN202310000175A CN115985426A CN 115985426 A CN115985426 A CN 115985426A CN 202310000175 A CN202310000175 A CN 202310000175A CN 115985426 A CN115985426 A CN 115985426A
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Abstract
The invention relates to a CAE (computer aided engineering) analysis method for the strength of an automobile auxiliary instrument panel handrail assembly. The method comprises the following steps: 1. acquiring mechanical parameters of materials of each part of the handrail assembly, wherein the materials have a welding line and do not have the welding line, and editing an INP material model; 2. respectively carrying out mold flow analysis on key parts of the handrail assembly in Moldflow software, and determining the welding line position and the convergence angle of the parts; 3. 3D data is converted into a finite element model for analysis through software Hypermesh modeling; 4. CAE simulation analysis is carried out in Abaqus software; 5. confirming an analysis result; 6. and evaluating the analysis result of the step 5, returning to the step 3, and locking the structure of the YES product. The method can improve the accuracy of the strength analysis of the automobile auxiliary instrument panel handrail assembly.
Description
Technical Field
The invention relates to an automobile part strength analysis method, in particular to a CAE (computer aided engineering) analysis method for automobile auxiliary instrument panel handrail assembly strength. Background
The automobile auxiliary instrument panel handrail assembly not only has the storage function, but also has the decoration function, and soft cladding gives people a comfort. If the strength of the armrest assembly is insufficient, abnormal sound is easily generated in the driving process of the vehicle, and the product quality is seriously influenced; or parts of the handrail assembly are partially separated or broken, the opening of the handrail is blocked or even can not be opened, so that complaints of users and customer complaints are increased, and meanwhile, the cost of replacing the parts is increased.
The material model is the basis of CAE analysis, the elastic modulus, the yield stress, the fracture stress and the strain mechanics parameters of the material are obtained through a spline tensile test, an injection mold needs to be redesigned when the tensile spline with the welding line is obtained, the strength of the material with the welding line cannot be generally tested, CAE analysis is carried out on the strength of the automobile auxiliary instrument panel armrest assembly in the current engineering data design stage, and the influence of the welding line of an injection product on the strength of the material is generally not considered. Upon examination of the prior art documents, the strength of the sample with the weld lines was about 50% of the strength of the sample without the weld lines. For functional part strength analysis, if the stress area has a weld line, the strength of the functional part will be reduced by about half. According to the method, the material parameters of different fusion line convergence angles are introduced in the strength CAE analysis, so that the analysis precision can be greatly improved, the insufficient strength and the fracture risk of the assembly are avoided, the subsequent setting cost is reduced, the period is shortened, the cost is reduced, the product quality is improved, and the pleasant experience of customers is enhanced.
Disclosure of Invention
The invention aims to provide a CAE (computer aided engineering) analysis method for the strength of an automobile auxiliary instrument panel handrail assembly so as to improve the accuracy of the strength analysis of the automobile auxiliary instrument panel handrail assembly.
The invention discloses a CAE (computer aided engineering) analysis method for the strength of an automobile auxiliary instrument panel handrail assembly, which comprises the following steps of:
And 2, respectively performing modular flow analysis on key parts of the armrest assembly in Moldflow software by utilizing 3D data of the automobile auxiliary instrument panel assembly provided by a product engineer, and determining the welding line position and the convergence angle of the parts.
And 3, converting the 3D data into a finite element model for analysis through software Hypermesh modeling.
And 4, performing CAE simulation analysis in Abaqus software.
And 5, confirming an analysis result.
And 6, evaluating the analysis result of the step 5, returning the NO to the step 3, and locking the YES product structure.
The step 1 comprises the following steps:
step 1.1, manufacturing a 1A dumbbell type standard sample strip: the weld line joining angles θ were 0 °, 45 °, 90 °, 135 °, and no weld line.
Step 1.2, spline tensile test: and clamping the 1A dumbbell type standard sample bar on a tensile testing machine, setting the tensile rates to be 1mm/min and 50mm/min respectively, and performing a tensile test to obtain the stress-strain curve of the material.
Step 1.3, stress-strain curve processing: and (4) converting the engineering stress-strain curve obtained by the test into a real stress-strain curve, and calculating the elastic modulus, the yield stress, the fracture stress and the plastic strain of the material.
Step 1.4, CAE simulation sample strip tensile test: and drawing a hexahedral mesh by using a sample strip, endowing the material parameters in the step 1.3, fixing one end of the sample strip, applying force to the other end of the sample strip, and simulating a sample strip tensile test to obtain a CAE analysis stress-strain curve.
And step 1.5, comparing the stress-strain curve with the actually measured stress-strain curve, analyzing the coincidence of the two curves, namely the stress-strain curve and the actually measured stress-strain curve, returning NO to the step 1.1, and carrying out YES next step.
And step 1.6, editing and storing the mechanical property parameters in Hypermesh, and exporting an INP material model for later use.
The step 2 comprises the following steps:
step 2.1, geometric model processing: and removing free edges, small round corners and small steps in the CADdoter, and exporting the UDM file.
And 2.2, importing the file exported in the step 2.1 into a Moldflow, creating a grid model, analyzing and selecting the optimal gate position, and determining the position of a welding line and a fusion angle.
The step 3 comprises the following steps:
and 3.1, establishing a finite element grid of each connecting component by using a modeling software Hypermesh, wherein the handrail base draws a tetrahedral grid, the metal rotating shaft draws a hexahedral grid, and other parts draw a middle surface grid.
And 3.2, according to the welding line position and the fusion angle in the step 2, endowing the material parameters of each part of the automobile auxiliary instrument panel assembly and the material parameters of the fusion angles of different welding lines into the finite element model by using the material model obtained in the step 1 and the material models in the material library.
And 3.3, creating a 1D connection unit for connecting the finite element grids.
And 3.4, applying internal load on the armrest assembly and setting boundary conditions of the auxiliary instrument panel assembly.
And 3.5, setting output and analyzing steps.
And 3.6, saving the models and exporting the INP file.
The step 4 comprises the following steps: and (3) importing the INP file of the finite element model of the automobile auxiliary instrument panel assembly into simulation analysis software Abaqus running analysis, and if the result is wrong or not converged, returning to the step 3.1 and the step 3.3 to check the model until a displacement and stress visual cloud picture is obtained.
The step 5 comprises the following steps: in the Abaqus Viewer, an analysis result ODB file is opened, four parts of an outer handrail cover plate, an inner handrail cover plate, a handrail base and a lower body of an auxiliary instrument panel are respectively and independently displayed, a stress cloud picture is checked, and the maximum stress and the appearing position of the corresponding part are confirmed.
The step 6 comprises the following steps: comparing the measured stress results with the yield stress of the material of each part, if the measured stress results are greater than the yield stress of the material, carrying out structural optimization, modifying the model, and returning to the step 3 until the analyzed stress is less than the yield stress of the material; if the yield stress is less than the yield stress of the corresponding material, the requirement is met, and the product structure is locked.
The invention has the following beneficial effects:
1. the tensile test of a certain PP + EPDM _ TD20 shows that the tensile strength of the material with or without the weld line is 24.3MPa (the tensile strength of the material is the yield stress), the tensile strength of the material with the weld line at a convergence angle of 45 degrees is 12.39MPa, and the tensile strength of the material with the weld line at a convergence angle of 0 degrees is 11.6MPa. For the strength analysis of the functional parts, if the stress area has the weld line, the strength of the functional parts is reduced by about a half, and the CAE analysis method introduces the material strength of the weld line, so that the precision of the strength analysis of the automobile console armrest assembly can be greatly improved.
2. Since obtaining tensile bars with weld lines requires redesign of the mold, and the strength of the material with weld lines is generally not tested, the conventional CAE analysis does not take into account the effect of the product weld lines on the strength of the material. According to the method, the weld line material model is led into the finite element model, so that the reliability of the strength analysis of the automobile auxiliary instrument panel armrest assembly is improved, the later-stage armrest assembly strength DV test can be basically replaced, and the test cost is reduced.
3. The strength analysis is carried out by applying the CAE analysis method in the project data design stage, the problem of insufficient strength of the handrail assembly can be found in advance, the problem of handrail breakage risk is avoided in the early stage, the later-stage setting cost is reduced, and the rectification and modification period is shortened.
Drawings
FIG. 1 is a flow chart of a CAE analysis method for a console armrest assembly of an automobile auxiliary instrument panel according to the present invention.
FIG. 2 is an exploded view of the motor vehicle center console assembly.
Fig. 3 is a schematic view of 1A dumbbell-type standard splines according to the present invention.
FIG. 4 is a schematic drawing of the tensile test of the electronic universal tester according to the present invention.
FIG. 5 is a schematic view of the angle at which the material weld lines meet according to the present invention.
FIG. 6 is a cross-sectional view of a material weld line scan according to the present invention.
FIG. 7 is a corresponding view of the points at the axle hole of the armrest assembly of the console of the automobile.
FIG. 8 is a schematic view of the armrest base and the metal shaft of the armrest assembly of the console of the automobile.
FIG. 9 is a schematic view of a partial mesh refinement of a handle base at the shaft hole fitting of the handle assembly of the console of the automobile.
FIG. 10 is a schematic view of a load-loading of an armrest assembly of a motor vehicle center console.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, the model of the automobile auxiliary dashboard assembly includes a handrail assembly 1, a rear blowing pipe rear-section assembly 2, an auxiliary dashboard left side wrapping accessory assembly 3, an auxiliary dashboard left side panel assembly 4, an auxiliary dashboard front connecting plate 5, an auxiliary dashboard lower body framework 6, an auxiliary dashboard upper body framework 7, an auxiliary dashboard right side wrapping accessory assembly 8, and a 3D model of an auxiliary dashboard right side panel assembly 9, and input data includes wall thickness, flanging, reinforcing ribs, and mounting and positioning structures and distribution.
The CAE analysis accuracy is related to a material model, a finite element mesh model, internal connection, boundary conditions and loading conditions, and in order to improve the analysis accuracy, each factor needs to pay attention to the state of simulation which is closest to the actual state. The specific analysis method is as follows:
Step 1.1, manufacturing a 1A dumbbell type standard spline 10 shown in the attached figure 3: when the injection mold was designed to stretch the splines, different gate positions were arranged to obtain weld line splines. And after the mold is machined, debugging the injection molding process to obtain 1A dumbbell-type standard splines 10 with fusion line convergence angles theta of 0 degrees, 45 degrees, 90 degrees and 135 degrees and without fusion lines.
Step 1.2, spline tensile test: the 1A dumbbell standard sample bar 10 is clamped on a tensile testing machine shown in figure 4, extensometers are arranged at sample bar scale distances, the tensile rates are set to be 1mm/min and 50mm/min respectively, and a tensile test is carried out to obtain a stress-strain curve of the material.
Step 1.3, stress-strain curve processing: and converting the engineering stress-strain curve obtained by the test into a real stress-strain curve according to a curve conversion formula, and calculating the elastic modulus, the yield stress, the fracture stress and the plastic strain of the material.
Step 1.4, CAE simulation sample strip tensile test: and drawing the 3D data of the 1A dumbbell-type standard spline 10 according to the actually measured spline size by utilizing Catia software. And (3) opening the Hypermesh software, importing spline 3D data, drawing a hexahedral mesh, endowing the material parameters in the step 1.3 on the spline finite element mesh, fixing one end of the spline, applying force to the other end of the spline, simulating a spline tensile test, and obtaining a CAE analysis stress-strain curve.
And step 1.5, analyzing the coincidence of the stress-strain curve and the actually measured stress-strain curve by comparing the sample strip tensile CAE, returning NO to the step 1.1, and carrying out YES next step.
And step 1.6, editing and storing the mechanical property parameters obtained in the step 1.3 in Hypermesh, and exporting an INP material model for later use.
And 2, respectively performing modular flow analysis on key parts of the armrest assembly in Moldflow software by using 3D data of the automobile auxiliary instrument panel assembly provided by a product engineer, and determining the welding line position and the fusion angle of the parts.
The strength of the material at the welding line is only about 50 percent of the actual strength of the material, and is even lower. When two or more melts meet in a mold cavity, the temperature, the pressure, the viscosity and the like of each melt are different, the melts cannot be effectively mixed and tangled, so that fusion marks with different meeting angles are generated on a product, as shown in fig. 5, a linear mark appears on the surface of a plastic part, and a V-shaped groove is formed on the section of the plastic part, as shown in fig. 6.
Step 2.1, geometric model processing: 3D data of the inner and outer cover plates of the handrail, the handrail base 14 and the lower body framework 6 of the auxiliary instrument panel are opened in Catia software, and files in an igs format are respectively exported. And importing the igs file in the CADdotor, processing the characteristics of the free edge, the small round corner and the small step, and exporting the UDM file.
And 2.2, importing the file exported in the step 2.1 into a Moldflow, creating a grid model, analyzing and selecting the optimal sprue position, and determining the position of a welding line and a fusion angle.
And 3, converting the 3D data into a finite element model for analysis through software Hypermesh modeling.
And 3.1, establishing a finite element grid of each connecting component by using a modeling software Hypermesh, wherein the handrail base 14 draws a tetrahedral grid, the metal rotating shaft 15 draws a hexahedral grid, and other parts draw a middle-surface grid.
The model unit of the metal rotating shaft 15 should be a hexahedron unit, and the nodes of the metal rotating shaft 15 should correspond to the matching nodes of the hole positions of the armrest base 14 one by one, as shown in fig. 7.
Because the cantilever at the matching part of the handrail base 14 and the metal rotating shaft 15 is long, as shown in fig. 8, the cantilever has a high possibility of being broken by force, and the stress distribution at the matching part of the shaft hole at the position needs to be considered during analysis, the modeling needs to pay attention to the following points:
a. the grid size of the handrail base 14 is drawn to be 2mm, the grid at the matching part of the shaft hole is thinned, and the size is 1mm as shown in figure 9.
b. The matching part of the hole of the handrail base 14 and the metal rotating shaft 15 needs to be in contact connection, the gap between the handrail base 14 and the metal rotating shaft 15 ensures that the rotating shaft and the base are not penetrated (the unilateral gap is controlled within 0.05 mm) in the rotating process of the rotating shaft, and the nodes correspond to each other.
And 3.2, endowing the material parameters of each part of the automobile auxiliary instrument panel assembly to a finite element model in Hypermesh software by using the material model obtained in the step 1 and the material model in the material library. And (3) for the weld line areas of the armrest base 14, the armrest inner cover plate and the sub instrument panel lower body framework 6 under stress, corresponding weld line material models are assigned to the five rows of grids in the weld line areas according to the weld line positions and the convergence angles obtained in the step (2).
3.3, creating a 1D connection unit for connecting each finite element grid: and checking the installation point position relation of each part of the auxiliary instrument board assembly in CATIA software, and establishing connection for the assembly relation of each part in Hypermesh software. a. The mounting structure is a bolt/screw: the 1D connecting unit restrains 1-6 degrees of freedom; b. the mounting structure is a V-shaped card: the 1D connecting unit restrains 1-6 degrees of freedom, and other self cards release corresponding degrees of freedom according to actual assembly conditions.
And 3.4, applying internal load on the armrest assembly 1 and setting boundary conditions of the auxiliary instrument panel assembly.
Applying a load: in the HyperMesh software, Z-direction load was applied to the outer arm panel middle region as indicated by the arrow in fig. 10.
Setting a boundary condition: the auxiliary instrument panel mounting bracket is fixed with the floor, the auxiliary instrument panel assembly is fixed with the CCB at the connecting point by 1-6 degrees of freedom, the X-direction translation degree of freedom and the Y-direction rotation degree of freedom are released from the front end of the auxiliary instrument panel assembly and the HAVC mounting point, and the degrees of freedom in other directions are fixed.
And 3.5, setting output and analysis steps.
Setting output: the Hypermesh software sets node output as displacement U and unit output as stress S and plastic strain PE.
Setting an analysis step: selecting analysis step solver parameters as Static analysis in Hypermesh software, and checking internal load, boundary condition options and output.
And 3.6, saving the models and exporting INP analysis files.
And 4, performing CAE simulation analysis in Abaqus software.
And (3) importing the INP file of the finite element model of the automobile auxiliary instrument panel assembly into simulation analysis software Abaqus, running analysis, and returning to the step 3.1 and/or the step 3.3 to check the model if error reporting or non-convergence occurs in the analysis process until a visual cloud picture of displacement and stress is obtained.
And 5, confirming an analysis result.
In Abaqus Viewer, an ODB file of an analysis result is opened, four parts of an outer handrail cover plate, a lower auxiliary instrument board body framework 6, a handrail base 14 and an inner handrail cover plate are respectively and independently displayed, a stress cloud picture is checked, and the maximum stress and the appearing position of the corresponding part are confirmed.
Claims (7)
1. The CAE analysis method for the strength of the automobile auxiliary instrument panel armrest assembly is characterized by comprising the following steps:
step 1, obtaining mechanical parameters of materials of parts of a handrail assembly, wherein the materials have a welding line and are not provided with the welding line, and editing an INP material model;
step 2, respectively performing modular flow analysis on key parts of the armrest assembly in Moldflow software by utilizing 3D data of the automobile auxiliary instrument panel assembly provided by a product engineer, and determining the welding line position and the convergence angle of the parts;
step 3, modeling through software Hypermesh, and converting the 3D data into a finite element model for analysis;
step 4, CAE simulation analysis is carried out in Abaqus software;
step 5, confirming an analysis result;
and 6, evaluating the analysis result of the step 5, returning the NO to the step 3, and locking the YES product structure.
2. The CAE analysis method for the strength of the armrest assembly of the automobile auxiliary instrument panel according to claim 1, wherein the step 1 comprises the following steps:
step 1.1, manufacturing a 1A dumbbell type standard sample strip: manufacturing splines with fusion line convergence angles theta of 0 degrees, 45 degrees, 90 degrees and 135 degrees and without fusion lines;
step 1.2, spline tensile test: clamping a 1A dumbbell type standard sample bar on a tensile testing machine, setting the tensile rates to be 1mm/min and 50mm/min respectively, and performing a tensile test to obtain a stress-strain curve of the material;
step 1.3, stress-strain curve processing: converting the engineering stress-strain curve obtained by the test into a real stress-strain curve, and calculating the elastic modulus, the yield stress, the fracture stress and the plastic strain of the material;
step 1.4, CAE simulation sample strip tensile test: drawing a hexahedral mesh by a spline, giving the material parameters in the step 1.3, fixing one end of the spline, applying force to the other end of the spline, and simulating a spline tensile test to obtain a CAE analysis stress-strain curve;
step 1.5, analyzing the coincidence of the stress-strain curve and the actually measured stress-strain curve by comparing the sample strip tensile CAE, returning NO to step 1.1, and carrying out YES next step;
and step 1.6, editing and storing the mechanical property parameters in Hypermesh, and exporting an INP material model for later use.
3. The CAE analysis method for the strength of the armrest assembly of the automobile auxiliary instrument panel according to claim 1, wherein the step 2 comprises the following steps:
step 2.1, geometric model processing: removing free edges, small round corners and small steps from the CADdotor, and exporting a UDM file;
and 2.2, importing the file exported in the step 2.1 into a Moldflow, creating a grid model, analyzing and selecting the optimal sprue position, and determining the position of a welding line and a fusion angle.
4. The CAE analysis method for the strength of the armrest assembly of the automobile auxiliary instrument panel according to claim 1, wherein the step 3 comprises the following steps:
3.1, establishing a finite element grid of each connecting component by using modeling software Hypermesh, wherein the handrail base draws a tetrahedral grid, the metal rotating shaft draws a hexahedral grid, and other parts draw a middle-surface grid;
step 3.2, according to the welding line position and the fusion angle in the step 2, giving the material parameters of each part of the automobile auxiliary instrument panel assembly and the material parameters of different fusion line fusion angles to a finite element model by using the material model obtained in the step 1 and the material models in a material library;
3.3, creating a 1D connection unit for connecting each finite element grid;
step 3.4, applying internal load on the armrest assembly and setting boundary conditions of the auxiliary instrument panel assembly;
step 3.5, setting output and analysis steps;
and 3.6, saving the models and exporting the INP file.
5. The CAE analysis method for the strength of the armrest assembly of the auxiliary instrument panel of the automobile as claimed in claim 1, wherein the step 4 comprises the following steps: and (3) importing the INP file of the finite element model of the automobile auxiliary instrument panel assembly into simulation analysis software Abaqus running analysis, and if the result is wrong or not converged, returning to the step 3.1 and the step 3.3 to check the model until a displacement and stress visual cloud picture is obtained.
6. The CAE analysis method for the strength of the armrest assembly of the automobile auxiliary instrument panel as claimed in claim 1, wherein the step 5 comprises the following steps: in the Abaqus Viewer, an analysis result ODB file is opened, four parts of an outer handrail cover plate, an inner handrail cover plate, a handrail base and a lower body of an auxiliary instrument panel are respectively and independently displayed, a stress cloud picture is checked, and the maximum stress and the appearing position of the corresponding part are confirmed.
7. The CAE analysis method for the strength of the armrest assembly of the automobile auxiliary instrument panel according to claim 1, wherein the step 6 comprises the following steps: comparing the measured stress results with the yield stress of the material of each part, if the measured stress results are greater than the yield stress of the material, carrying out structural optimization, modifying the model, and returning to the step 3 until the analyzed stress is less than the yield stress of the material; if the yield stress is less than the yield stress of the corresponding material, the requirement is met, and the product structure is locked.
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| CN202310000175.1A CN115985426A (en) | 2023-01-02 | 2023-01-02 | CAE (computer aided engineering) analysis method for strength of automobile auxiliary instrument panel handrail assembly |
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| CN202310000175.1A CN115985426A (en) | 2023-01-02 | 2023-01-02 | CAE (computer aided engineering) analysis method for strength of automobile auxiliary instrument panel handrail assembly |
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