CN109117569A - Collision finite element model modeling method with octagon spot welding heat-affected zone structure - Google Patents
Collision finite element model modeling method with octagon spot welding heat-affected zone structure Download PDFInfo
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Abstract
Present invention discloses a kind of collision finite element model modeling methods with octagon spot welding heat-affected zone structure, comprising: imports collision finite element model；The spot welding centralized positioning of finite element grid；Finite element grid amendment；Determine the nugget area diameter and heat affected area diameter of spot welding；Generate the finite element grid area of octagonal nugget area and heat affected area；Attribute assignment is carried out to the finite element grid area in octagonal nugget area and heat affected area.Collision finite element model modeling method with octagon spot welding heat-affected zone structure of the invention has as follows a little: modeling process is increasingly automated, without manually modeling, the collision finite element model with octagon spot welding heat-affected zone structure can be quickly generated, the risk of heat stamping and shaping part spot welding heat-affected zone tearing is predicted by the simulation of collision solver simulation analysis, to promote the collision performance of body structure and shorten the body structure development cycle and reduce development cost.
Description
Technical field
The present invention relates to automobile manufacturing fields, more specifically to the modeling of the software auxiliary in automobile manufacturing process
Method.
Background technique
Studies have shown that the weight of automobile is every to reduce 10%, complete-vehicle oil consumption can reduce substantially 6%-8%.It is resistance to for vehicle
Hitting property and lightweight demand are widely applied on body structure using the sheet metal component of thermoforming process (Hot Forming).
Thermoforming part master car body component to be applied such as center body pillar, floor side member, sill strip etc..Body structure collision performance is demanding
Position uses thermoforming part, not only can satisfy relevant crash requirements, can also obtain good weight loss effect.In body structure
In, other than thermoforming part, there is also a large amount of non-thermal molded parts.Thermoforming part and non-thermal molded part pass through electricity on flange
The mode for hindering spot welding, forms complete cavity structure.The composite structure formed is welded not only by thermoforming part and non-thermal molded part
Body structure collision performance can be provided, can also reduce car body weight well.
Since the strength and stiffness of the thermoforming part using thermoforming process are generally higher than other non-thermal sheet formings, and
The spot welding of the two connection can then form nugget area (FZ, Fusion Zone) and heat affected area (HAZ, Heat on thermoforming part
Affected Zone).It is influenced by resistance spot welding process, the material in the domain of thermoforming part spot welding heat-affected zone is relative to warm
Molded part base material, the strength of materials and hardness can occur significantly to decline, and cause in vehicle body collision process, cavity structure bending or
It is crushed serious place, the phenomenon that material of corresponding thermoforming part spot welding heat-affected zone is likely to occur tearing.
In order to predict the risk of thermoforming part spot welding heat-affected zone tearing in collision simulation is analyzed, area of computer aided is needed
Modeling, to simulate the collision situation and tearing risk of spot welding heat-affected zone structure.
Summary of the invention
Present invention discloses it is a kind of using octagon spot welding heat-affected zone structure collision finite element model modeling method,
The collision model can be used for predicting the tearing risk of the spot welding heat-affected zone of heat stamping and shaping part in collision simulation.
An embodiment according to the present invention proposes a kind of collision finite element mould with octagon spot welding heat-affected zone structure
Type modeling method, comprises the following steps that
Collision finite element model is imported, includes the model of thermoforming part, thermoforming in the collision finite element model imported
Part is connect by spot welding with non-thermal molded part, includes spot welding model on the model of thermoforming part；
The spot welding centralized positioning of finite element grid, the model of thermoforming part and spot welding model are placed in finite element grid,
The nearest grid node of central point apart from spot welding model is determined as the spot welding center N0 of finite element grid；
Finite element grid amendment, judges the spot welding center N0 of finite element grid and the distance between the central point of spot welding model
Whether R is less than error threshold, if distance R is greater than error threshold, to limited near the spot welding center N0 of finite element grid
First grid is adjusted, so that distance R is less than error threshold；When distance R is less than error threshold, finite element grid and finite element net
The spot welding center N0 of lattice is formed；
Determine the nugget area diameter D1 and heat affected area diameter D2 of spot welding；
Generate the finite element grid area of octagonal nugget area and heat affected area；
Attribute assignment is carried out to the finite element grid area in octagonal nugget area and heat affected area.
In one embodiment, thermoforming part is connect by one group of spot welding with non-thermal molded part, each spot welding includes position
Nugget area in center and the heat affected area around nugget area.
In one embodiment, in the spot welding centering step of finite element grid, first with the central point of spot welding model
Centered on establish cubic space, the side length of the cubic space is L, calculates all finite elements being located in the cubic space
The grid node of grid and center distance R, spot welding center of the grid node with the smallest distance R as finite element grid
N0。
In one embodiment, the side length L of cubic space is 5-10 times of the diameter in the nugget area of spot welding.
In one embodiment, the nugget area diameter D1 and heat affected area diameter D2 of spot welding are inputted by user.
In one embodiment, the finite element grid area for generating octagonal nugget area and heat affected area includes following step
It is rapid:
Determine four grids of the spot welding center N0 comprising finite element grid, the grid is on the model of thermoforming part
Finite element grid；
It determines eight peripheral meshes nodes of four grids, and deletes four grids；
Eight peripheral meshes nodes are adjusted at a distance from N0, so that each peripheral meshes node is equal to heat at a distance from N0
Zone of influence radius, i.e. 1/2*D2, adjusted peripheral meshes node are still on the line of N0 and former peripheral meshes node；
On the line of N0 and each peripheral meshes node, a corresponding nugget area outer ring node is determined, each
Nugget area outer ring node is equal to the radius in nugget area, i.e. 1/2*D1, totally eight nugget area outer ring nodes at a distance from N0；
One group of adjacent peripheral meshes node and corresponding one group of adjacent nugget area outer ring node form a quadrangle,
The quadrangle is the finite element grid of a heat affected area, the finite element grid of totally eight heat affected areas, and combination, which is formed, has eight
The finite element grid area of the heat affected area of side shape outer profile and octagon Internal periphery；
One group of adjacent nugget area outer ring node and N0 form a triangle, which is the limited of a nugget area
First grid, the finite element grid in totally eight nugget areas, combination form the finite element grid with the nugget area of octagon outer profile
Area.
In one embodiment, adjust eight peripheral meshes nodes includes: at a distance from N0
Each peripheral meshes node is calculated at a distance from N0, if peripheral meshes node is not equal to hot shadow at a distance from N0
Area's radius is rung, i.e. 1/2*D2 then establishes the one-dimensional coordinate system between N0 and the peripheral meshes node, adjusts in the one-dimensional coordinate system
The position of the whole peripheral meshes node, so that the peripheral meshes node is equal to heat affected area radius, i.e. 1/2*D2 at a distance from N0.
In one embodiment, attribute assignment packet is carried out to the finite element grid area in octagonal nugget area and heat affected area
It includes:
Finite element grid on the model of thermoforming part assigns material, the thickness profile of thermoforming part；
The finite element grid in nugget area assigns material, the thickness profile of thermoforming part；
The finite element grid of heat affected area assigns the thickness profile of thermoforming part, the material of the finite element grid of heat affected area
Attribute zooms in and out to obtain by true stress and strain curve of the zoom factor to the material of thermoforming part, formula are as follows:
σ=k ε
In formula, σ is true stress, and ε is logarithmic strain, and k is zoom factor.
In one embodiment, the material properties of the finite element grid of heat affected area also have failure parameter, failure parameter
The empirical equation of REL_THIN is as follows:
In formula, εplFor the maximum plastic strain value of material；
Spot welding belonging to the heat affected area has failure definition, the formula for definition of failing are as follows:
In formula, NORMALFORCE and SHEARFORCE are the practical pulling force and shear value being subject to of solder joint respectively, AFAIN and
AFAILS is the maximum pull value and maximum shear value that solder joint can bear, A respectively1And A2For exponential factor.
Collision finite element model modeling method with octagon spot welding heat-affected zone structure of the invention has following
A little: modeling process is increasingly automated, without manually modeling, can quickly generate and tie with octagon spot welding heat-affected zone
The collision finite element model of structure predicts that heat stamping and shaping part spot welding heat-affected zone is torn by the simulation of collision solver simulation analysis
The risk split, to promote the collision performance of body structure and shorten the body structure development cycle and reduce development cost.
Detailed description of the invention
The above and other feature of the present invention, property and advantage will pass through description with reference to the accompanying drawings and examples
And become apparent, identical appended drawing reference always shows identical feature in the accompanying drawings, in which:
Fig. 1 discloses the collision finite element with octagon spot welding heat-affected zone structure of an embodiment according to the present invention
The flow chart of model modelling approach.
Fig. 2 discloses the collision finite element with octagon spot welding heat-affected zone structure of an embodiment according to the present invention
The schematic diagram of the finite element grid formed in model modelling approach.
Fig. 3 a- Fig. 3 f discloses the collision with octagon spot welding heat-affected zone structure of an embodiment according to the present invention
The process in the finite element grid area of octagonal nugget area and heat affected area is generated in finite element model modeling method.
Fig. 4 discloses the collision finite element with octagon spot welding heat-affected zone structure of an embodiment according to the present invention
The schematic diagram in the octagonal nugget area and heat affected area finite element grid area that are formed in model modelling approach.
Fig. 5 discloses the schematic diagram of the initial crossbeam collision finite element model for importing state.
Fig. 6, which is disclosed, collides finite element model in the crossbeam that spot welding position is formed with octagonal nugget area and heat affected area
Schematic diagram.
Specific embodiment
The present invention is directed to propose a kind of collision finite element model modeling method with octagon spot welding heat-affected zone structure.
Fig. 1 discloses the collision finite element model modeling with octagon spot welding heat-affected zone structure of an embodiment according to the present invention
The flow chart of method, the modeling method comprise the following steps that
S101, collision finite element model is imported, includes the model of thermoforming part in the collision finite element model imported.Heat
Molded part is connect by spot welding with non-thermal molded part, includes spot welding model on the model of thermoforming part.
The spot welding centralized positioning of S102, finite element grid.The model of thermoforming part and spot welding model are placed in finite element net
In lattice, the nearest grid node of central point apart from spot welding model is determined as the spot welding center N0 of finite element grid.
S103, finite element grid amendment.Judge between the spot welding center N0 of finite element grid and the central point of spot welding model
Distance R whether be less than error threshold, if distance R be greater than error threshold, near the spot welding center N0 of finite element grid
Finite element grid be adjusted so that distance R be less than error threshold；When distance R is less than error threshold, finite element grid and have
Limit the spot welding center N0 sizing of first grid.
S104, the nugget area diameter D1 and heat affected area diameter D2 for determining spot welding.
S105, the finite element grid area for generating octagonal nugget area and heat affected area.
S106, attribute assignment is carried out to the finite element grid area in octagonal nugget area and heat affected area.
Below by taking collision beam as an example, illustrating the collision with octagon spot welding heat-affected zone structure of the invention has
Limit the realization process of meta-model modeling method.Fig. 5 discloses the schematic diagram of the initial crossbeam collision finite element model for importing state.
Collision beam is made of thermoforming part outside plate 102 and non-thermal molded part inner panel 104, thermoforming part outside plate 102 and non-thermal molded part
Inner panel 104 realizes physical connection by the spot welding 106 in two lateral flanges.
In step s101, import collision finite element model, the collision finite element model imported i.e. as shown in figure 5, its
In include thermoforming part model, i.e. the model of thermoforming part outside plate 102.It further include the model for having non-thermal molded part inner panel 104.
Thermoforming part is connect by spot welding with non-thermal molded part, includes the model of spot welding 106 on the model of thermoforming part.Thermoforming part is logical
One group of spot welding is crossed to connect with non-thermal molded part.Each spot welding includes centrally located nugget area and the hot shadow around nugget area
Ring area.In subsequent step, it is necessary to form octagonal nugget area in the position of each spot welding and around the nugget area
, the heat affected area with octagon Internal periphery and octagon outer profile.
In step s 102, the spot welding center of finite element grid is positioned.By the model of thermoforming part and spot welding mould
Type is placed in finite element grid, in the spot welding that the nearest grid node of the central point apart from spot welding model is determined as finite element grid
Heart N0.In one embodiment, detailed process is as follows by step S102: first with the central point of spot welding model (practical spot welding center
Point) centered on establish cubic space, the side length of the cubic space is L.In one embodiment, the side length of cubic space
L is 5-10 times of the diameter in the nugget area of spot welding.Calculate the grid section for all finite element grids being located in the cubic space
Point and center distance R, spot welding center N0 of the grid node with the smallest distance R as finite element grid.N0 is one
The node of finite element grid, and be the grid node nearest apart from the practical spot welding central point of spot welding model.At subsequent place
It is the center come with the spot welding center N0 of finite element grid as spot welding model in reason.
In step s 103, finite element grid is modified.In above-mentioned step S102, with the section of finite element grid
Point N0 comes the practical spot welding center as spot welding model, therefore deviation between the two cannot be excessive.In one embodiment, sentence
Whether the spot welding center N0 and the distance between the central point of spot welding model R of disconnected finite element grid are less than error threshold.Error threshold
Value is traditionally arranged to be no more than 1mm.If distance R is greater than error threshold, near the spot welding center N0 of finite element grid
Finite element grid is adjusted, so that distance R is less than error threshold.When distance R is less than error threshold, finite element grid and limited
The spot welding center N0 of first grid is formed.In subsequent processing, just the spot welding center N0 of finite element grid as in practical spot welding
The heart come using.The collision with octagon spot welding heat-affected zone structure that Fig. 2 discloses an embodiment according to the present invention is limited
The schematic diagram of the finite element grid formed in meta-model modeling method.Grid node N0 in Fig. 2 is exactly the point of finite element grid
Weldering center N0.BM indicates the model of thermoforming part, that is, shows that finite element grid is formed on the model of thermoforming part.
In step S104, the nugget area diameter D1 and heat affected area diameter D2 of spot welding are determined.In one embodiment, point
The nugget area diameter D1 and heat affected area diameter D2 of weldering are inputted by user.User can be according in different automobile types and different components
Practical spot welding size input nugget area diameter D1 and heat affected area diameter D2.
In step s105, the finite element grid area of octagonal nugget area and heat affected area is generated.Fig. 3 a- Fig. 3 f is disclosed
In the collision finite element model modeling method with octagon spot welding heat-affected zone structure of an embodiment according to the present invention
Generate the process in the finite element grid area of octagonal nugget area and heat affected area.As shown in Fig. 3 a- Fig. 3 f, generate octagonal
The finite element grid area of nugget area and heat affected area includes:
As shown in Figure 3a, four grids S1, S2, S3 and S4 of the spot welding center N0 comprising finite element grid are determined.Grid
S1, S2, S3 and S4 are the finite element grids on the model of thermoforming part.
As shown in Figure 3b, eight peripheral meshes node N1, N2, N3, N4, N5, N6, N7, N8 of four grids are determined, and are deleted
Except four grids S1, S2, S3 and S4.The spot welding center N0 of finite element grid still retains.
As shown in Figure 3c, eight peripheral meshes nodes N1, N2, N3, N4, N5, N6, N7, N8 are adjusted at a distance from N0, so that
Each peripheral meshes node N1, N2, N3, N4, N5, N6, N7, N8 are equal to heat affected area radius, i.e. 1/2*D2 at a distance from N0.
Adjusted peripheral meshes node is still on the line of N0 and former peripheral meshes node.Specifically, eight peripheries of adjustment
Grid node include: at a distance from N0 calculate each peripheral meshes node N1, N2, N3, N4, N5, N6, N7, N8 and N0 away from
From.If peripheral meshes node is not equal to heat affected area radius at a distance from N0, i.e. 1/2*D2 then establishes N0 and the peripheral meshes
One-dimensional coordinate system between node.The position of the peripheral meshes node is adjusted in the one-dimensional coordinate system, so that the peripheral meshes
Node is equal to heat affected area radius, i.e. 1/2*D2 at a distance from N0.By distance adjust after, eight peripheral node N1, N2, N3,
N4, N5, N6, N7, N8 form an octagonal profile.
As shown in Figure 3d, on the line of N0 and each peripheral meshes node N1, N2, N3, N4, N5, N6, N7, N8, really
Fixed a corresponding nugget area outer ring node F1, F2, F3, F4, F5, F6, F7, F8.Each nugget area outer ring node F1, F2,
F3, F4, F5, F6, F7, F8 at a distance from N0 be equal to nugget area radius, i.e. 1/2*D1, totally eight nugget areas outer ring node F1,
F2,F3,F4,F5,F6,F7,F8.Eight nugget areas outer ring node F1, F2, F3, F4, F5, F6, F7, F8 also form octagonal
Profile.
As shown in Figure 3 e, one group of adjacent peripheral meshes node and corresponding one group of adjacent nugget area outer ring node composition
One quadrangle, the quadrangle are the finite element grid of a heat affected area, the finite element grid of totally eight heat affected areas, combination
Form the finite element grid area with the heat affected area of octagon outer profile and octagon Internal periphery.In Fig. 3 e, light gray color table
The finite element grid area for showing the heat affected area with octagon outer profile and octagon Internal periphery is made of eight quadrangles.
As illustrated in figure 3f, one group of adjacent nugget area outer ring node and N0 form a triangle, which is one
The finite element grid in nugget area, the finite element grid in totally eight nugget areas, combination form the finite element with octagon outer profile
Grid regions.In Fig. 3 f, Dark grey indicates the finite element grid area of nugget area with octagon outer profile, by eight triangle sets
At.
Fig. 4 discloses the collision finite element with octagon spot welding heat-affected zone structure of an embodiment according to the present invention
The schematic diagram in the octagonal nugget area and heat affected area finite element grid area that are formed in model modelling approach.Its Oxford gray table
Show finite element grid area of the nugget area FZ with octagon outer profile, by eight triangle sets at.Finite element grid area of nugget area
FZ has diameter D1.Light gray indicates the finite element grid area with the heat affected area of octagon outer profile and octagon Internal periphery
HAZ is made of eight quadrangles.The finite element grid area HAZ of heat affected area has diameter D2.Finite element grid area of nugget area FZ
Finite element grid area HAZ with heat affected area is centered on the spot welding center N0 of finite element grid.Nugget area finite element grid
Area FZ and the finite element grid area HAZ of heat affected area are both formed on the Model B M of thermoforming part.
Fig. 6, which is disclosed, collides finite element model in the crossbeam that spot welding position is formed with octagonal nugget area and heat affected area
Schematic diagram.In the position of each spot welding, nugget area FZ and heat affected area HAZ are formd.
In step s 106, attribute assignment is carried out to the finite element grid area in octagonal nugget area and heat affected area.Institute
The attribute assignment of meaning mainly assigns material properties and thickness profile to finite element grid.In one embodiment, to octagon
Nugget area and heat affected area finite element grid area carry out attribute assignment include:
Finite element grid on the model of thermoforming part assigns material, the thickness profile of thermoforming part.I.e. in the region BM
Material, the thickness profile of finite element grid imparting thermoforming part.
The finite element grid in nugget area assigns material, the thickness profile of thermoforming part.I.e. in the finite element grid in the region FZ
Assign material, the thickness profile of thermoforming part.
For the finite element grid of heat affected area HAZ, thickness profile is to confer to the thickness profile of thermoforming part, and heat affecting
The material properties of the finite element grid of area HAZ are the true stress and strain curves by zoom factor to the material of thermoforming part
It zooms in and out to obtain, formula are as follows:
σ=k ε
In formula, σ is true stress, and ε is logarithmic strain, and k is zoom factor.
In one embodiment, the material properties of the finite element grid of heat affected area HAZ also have failure parameter, failure ginseng
The empirical equation of number REL_THIN is as follows:
In formula, εplFor the maximum plastic strain value of material；
Spot welding belonging to the heat affected area has failure definition, the formula for definition of failing are as follows:
In formula, NORMALFORCE and SHEARFORCE are the practical pulling force and shear value being subject to of solder joint respectively, AFAIN and
AFAILS is the maximum pull value and maximum shear value that solder joint can bear, A respectively1And A2For exponential factor.
Collision finite element model modeling method with octagon spot welding heat-affected zone structure of the invention has following
A little: modeling process is increasingly automated, without manually modeling, can quickly generate and tie with octagon spot welding heat-affected zone
The collision finite element model of structure predicts that heat stamping and shaping part spot welding heat-affected zone is torn by the simulation of collision solver simulation analysis
The risk split, to promote the collision performance of body structure and shorten the body structure development cycle and reduce development cost.
Above-described embodiment, which is available to, to be familiar with person in the art to realize or use the present invention, and is familiar with this field
Personnel can make various modifications or variation, thus this to above-described embodiment without departing from the present invention in the case of the inventive idea
The protection scope of invention is not limited by above-described embodiment, and should meet inventive features that claims are mentioned most
On a large scale.
Claims (9)
1. a kind of collision finite element model modeling method with octagon spot welding heat-affected zone structure characterized by comprising
Collision finite element model is imported, includes the model of thermoforming part, the thermoforming in the collision finite element model imported
Part is connect by spot welding with non-thermal molded part, includes spot welding model on the model of the thermoforming part；
The spot welding centralized positioning of finite element grid, the model of thermoforming part and spot welding model is placed in finite element grid, distance
The nearest grid node of the central point of spot welding model is determined as the spot welding center N0 of finite element grid；
Finite element grid amendment, judges that the spot welding center N0 of finite element grid and the distance between the central point of spot welding model R is
It is no to be less than error threshold, if distance R is greater than error threshold, to the finite element net near the spot welding center N0 of finite element grid
Lattice are adjusted, so that distance R is less than error threshold；When distance R is less than error threshold, finite element grid and finite element grid
Spot welding center N0 sizing；
Determine the nugget area diameter D1 and heat affected area diameter D2 of spot welding；
Generate the finite element grid area of octagonal nugget area and heat affected area；
Attribute assignment is carried out to the finite element grid area in octagonal nugget area and heat affected area.
2. there is the collision finite element model modeling method of octagon spot welding heat-affected zone structure as described in claim 1,
It is characterized in that, thermoforming part is connect by one group of spot welding with non-thermal molded part, each spot welding includes centrally located nugget area
And the heat affected area around nugget area.
3. there is the collision finite element model modeling method of octagon spot welding heat-affected zone structure as described in claim 1,
It is characterized in that, in the spot welding centering step of finite element grid, the foundation cube first centered on the central point of spot welding model
Body space, the side length of the cubic space are L, calculate the grid node for all finite element grids being located in the cubic space
With center distance R, spot welding center N0 of the grid node with the smallest distance R as finite element grid.
4. there is the collision finite element model modeling method of octagon spot welding heat-affected zone structure as claimed in claim 3,
It is characterized in that, the side length L of the cubic space is 5-10 times of the diameter in the nugget area of spot welding.
5. there is the collision finite element model modeling method of octagon spot welding heat-affected zone structure as described in claim 1,
It is characterized in that, the nugget area diameter D1 and heat affected area diameter D2 of spot welding are inputted by user.
6. there is the collision finite element model modeling method of octagon spot welding heat-affected zone structure as described in claim 1,
It is characterized in that, the finite element grid area for generating octagonal nugget area and heat affected area includes:
Determine four grids of the spot welding center N0 comprising finite element grid, the grid is having on the model of thermoforming part
Limit first grid；
It determines eight peripheral meshes nodes of four grids, and deletes four grids；
Eight peripheral meshes nodes are adjusted at a distance from N0, so that each peripheral meshes node is equal to heat affecting at a distance from N0
Area's radius, i.e. 1/2*D2, adjusted peripheral meshes node are still on the line of N0 and former peripheral meshes node；
On the line of N0 and each peripheral meshes node, a corresponding nugget area outer ring node, each nugget are determined
Area outer ring node is equal to the radius in nugget area, i.e. 1/2*D1, totally eight nugget area outer ring nodes at a distance from N0；
One group of adjacent peripheral meshes node and corresponding one group of adjacent nugget area outer ring node form a quadrangle, this four
Side shape is the finite element grid of a heat affected area, the finite element grid of totally eight heat affected areas, and combination, which is formed, has octagon
The finite element grid area of the heat affected area of outer profile and octagon Internal periphery；
One group of adjacent nugget area outer ring node and N0 form a triangle, which is the finite element net in a nugget area
Lattice, the finite element grid in totally eight nugget areas, combination form the finite element grid area with the nugget area of octagon outer profile.
7. there is the collision finite element model modeling method of octagon spot welding heat-affected zone structure as claimed in claim 6,
It is characterized in that, adjust eight peripheral meshes nodes includes: at a distance from N0
Each peripheral meshes node is calculated at a distance from N0, if peripheral meshes node is not equal to heat affected area at a distance from N0
Radius, i.e. 1/2*D2 then establish the one-dimensional coordinate system between N0 and the peripheral meshes node, and adjustment should in the one-dimensional coordinate system
The position of peripheral meshes node, so that the peripheral meshes node is equal to heat affected area radius, i.e. 1/2*D2 at a distance from N0.
8. there is the collision finite element model modeling method of octagon spot welding heat-affected zone structure as described in claim 1,
It is characterized in that, carrying out attribute assignment to the finite element grid area in octagonal nugget area and heat affected area includes:
Finite element grid on the model of thermoforming part assigns material, the thickness profile of thermoforming part；
The finite element grid in nugget area assigns material, the thickness profile of thermoforming part；
The finite element grid of heat affected area assigns the thickness profile of thermoforming part, the material properties of the finite element grid of heat affected area
It zooms in and out to obtain by true stress and strain curve of the zoom factor to the material of thermoforming part, formula are as follows:
σ=k ε
In formula, σ is true stress, and ε is logarithmic strain, and k is zoom factor.
9. there is the collision finite element model modeling method of octagon spot welding heat-affected zone structure as claimed in claim 8,
It is characterized in that, the material properties of the finite element grid of heat affected area also have failure parameter, the experience of failure parameter REL_THIN
Formula is as follows:
In formula, εplFor the maximum plastic strain value of material；
Spot welding belonging to the heat affected area has failure definition, the formula for definition of failing are as follows:
In formula, NORMALFORCE and SHEARFORCE are the practical pulling force and shear value being subject to of solder joint respectively, AFAIN and
AFAILS is the maximum pull value and maximum shear value that solder joint can bear, A respectively1And A2For exponential factor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111639449A (en) * | 2020-05-26 | 2020-09-08 | 东风小康汽车有限公司重庆分公司 | Welding spot modeling method, device and system |
| CN111767661A (en) * | 2019-03-12 | 2020-10-13 | 广州汽车集团股份有限公司 | Method, device and system for automatically generating finite element model of automobile body and computer storage medium |
| 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 |
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| CN101246512A (en) * | 2008-03-13 | 2008-08-20 | 上海交通大学 | Assembly soldering plate welded seam finite element modeling method based on vehicle collision simulation |
| CN101561840A (en) * | 2009-06-02 | 2009-10-21 | 肖锋 | Numerical value simulation method for spot welding connection and failure thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101246512A (en) * | 2008-03-13 | 2008-08-20 | 上海交通大学 | Assembly soldering plate welded seam finite element modeling method based on vehicle collision simulation |
| CN101561840A (en) * | 2009-06-02 | 2009-10-21 | 肖锋 | Numerical value simulation method for spot welding connection and failure thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111767661A (en) * | 2019-03-12 | 2020-10-13 | 广州汽车集团股份有限公司 | Method, device and system for automatically generating finite element model of automobile body and computer storage medium |
| CN111767661B (en) * | 2019-03-12 | 2024-03-19 | 广州汽车集团股份有限公司 | Automatic generation method, device and system for finite element model of automobile body and computer storage medium |
| CN111639449A (en) * | 2020-05-26 | 2020-09-08 | 东风小康汽车有限公司重庆分公司 | Welding spot modeling method, device and system |
| 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 |
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