CN110909431B - Design method of dissimilar material connecting structure for automobile and connecting structure thereof - Google Patents
Design method of dissimilar material connecting structure for automobile and connecting structure thereof Download PDFInfo
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Abstract
The invention discloses a design method of a dissimilar material connecting structure for an automobile and the connecting structure thereof. The connection structure provided by the invention comprises a base material plate A, a base material plate B, a mechanical connection component and a structure glue layer. And structural glue is coated between the overlapped parts of the base material plate A and the base material plate B, and the base material plate A and the base material plate B are connected by using a self-piercing riveting process. The invention overcomes the problems of obviously lower strength and reduced rigidity of self-piercing riveting relative to spot welding by a composite connection method, improves the connection strength of a joint surface by using structural adhesive, and improves the fatigue performance and the energy absorption characteristic of a connecting part. In addition, the method for designing the vehicle body dissimilar material structure comprises the steps of determining material types and performance indexes according to a multi-material vehicle body technical route, performing parameter design on a connecting structure by using a multidisciplinary multi-target optimization design method, evaluating the connecting performance through a material performance test, and finally applying the connecting design to each part of a vehicle body so as to realize the light weight design of the multi-material vehicle body.
Description
Technical Field
The invention relates to a connecting structure of automobile dissimilar materials in the field of automobiles, in particular to a design method of the connecting structure of the automobile dissimilar materials and the connecting structure of the automobile dissimilar materials.
Background
With the continuous improvement of the energy saving and emission reduction requirements of automobiles, the lightweight technology of automobiles is gradually developed, wherein the design of multi-material automobile bodies becomes the mainstream direction of development due to the excellent weight reduction effect. More and more new materials are used for designing automobile bodies, so that the traditional connecting technology cannot meet the requirement. At present, the main methods for connecting dissimilar materials include mechanical connection (bolt connection, self-piercing riveting, hot melting and self-tapping screw connection), resistance spot welding, laser welding and the like. According to the application condition of most of the vehicle enterprises, the mechanical connection is an inevitable process choice, wherein the self-piercing riveting process is most widely applied, but the self-piercing riveting has the obvious problems of lower strength and reduced rigidity compared with the traditional spot welding.
In the existing patents and documents, much attention is focused on designing additional devices and processes to increase mechanical connection strength and reduce cost, and research on designing a composite connection method by using the existing process conditions is less, and meanwhile, a design and evaluation method of material performance and application to a vehicle body are less considered.
Disclosure of Invention
The invention provides a design method of a dissimilar material connecting structure for an automobile and the connecting structure thereof, aiming at solving the technical problems of low strength and low rigidity.
The invention is realized by adopting the following technical scheme: 1. a design method of a dissimilar material connecting structure for an automobile is characterized by comprising the following steps: the design method comprises the following steps:
the method comprises the following steps: determination of dissimilar material type and performance index:
from the structural performance of the whole vehicle body, key parts influencing the performance indexes of the vehicle body dissimilar materials are respectively found out by using a sensitivity analysis method;
selecting performance indexes of different materials of the vehicle body, and determining the material type of the key component according to the multi-material vehicle body technical route;
step two: designing the connection performance of the dissimilar material connection structure: after the material type and the performance index of the key component are determined, the specific model and the structural parameters of the dissimilar materials are determined and designed;
the method comprises the following steps of finishing the connection performance determination of a dissimilar material connection structure by a multi-objective optimization method by taking the structural parameters of dissimilar materials as design variables, the performance indexes of the dissimilar materials as constraints and targets, taking finite element simulation as drive and taking test design, approximate model construction and precision inspection and optimization algorithm as cores;
(1) Design of experiments
Setting the material brand of the base material A plate as M A The material brand of the base material B plate is M B The width of the structural adhesive layer is L, and the thicknesses of the base material A plate and the base material B plate are T respectively A And T B I.e. M A 、M B 、L、T A And T B Is a design variable;
setting the properties of the dissimilar materials corresponding to the correlation properties as design response, wherein the correlation properties comprise the elastic modulus E, the maximum load P, the average load F and the fatigue life N of the dissimilar materials; according to the performance requirements of different modules of the vehicle body, the structural parameters M of different materials A 、M B 、L、T A And T B For design variables, the elastic modulus E and the maximum load P of a dissimilar material are taken as constraints, and the mass W, the average load F and the fatigue life N are taken as optimization design targets;
generating 60 sample points by adopting an optimal Latin hypercube design method, and obtaining the response value of each sample point through finite element simulation;
(2) Approximate model construction and precision inspection
Adopting an approximate model to replace a real model to predict response at an unknown part, adopting a radial basis function to fit a response function, and constructing a radial basis function approximate model by using sample data to generate 10 groups of sample data;
and estimating the error between the approximate model and the sample point by using the statistic certainty coefficient and the root mean square error, wherein the mathematical expression is as follows:
wherein, y i 、
The simulated value, the corresponding approximate model predicted value and the simulated value of the response of the verification point are respectivelyAverage value of (a); r is 2 For the statistic certainty coefficient, RMSE is the root mean square error;
when R is 2 The RMSE is less than 0.1 and is more than 0.9, which indicates that the precision of the constructed radial basis function approximation model meets the requirement, thereby replacing finite element simulation for subsequent optimization design;
if the requirements are not met, adding sample points, and carrying out test design again;
(3) Optimization algorithm
The mathematical model of the multi-objective optimization design is as follows:
carrying out optimization design by using the constructed radial basis function approximation model, carrying out optimization solution on the radial basis function approximation model by using an improved non-dominated sorting genetic algorithm, carrying out finite element simulation verification on an optimized result, and if the optimized result meets the requirement, obtaining a parameter value for designing the performance of the dissimilar material connection structure by the optimization solution;
if the requirements are not met, optimizing design variables and targets, and carrying out test design again;
step three: evaluation of connection Performance of dissimilar Material connection Structure: after the structural parameters of the dissimilar materials meet the performance requirements through optimized design, carrying out corresponding experimental tests to evaluate the connection performance of the dissimilar material connection structure, and evaluating the connection performance of the dissimilar material connection structure according to experimental results;
step four: the connection design applies the whole vehicle body: after the connection performance test evaluation test of the dissimilar material connection structure is completed, the structural parameters of the specific material model, the plate thickness and the structural adhesive layer width are obtained and applied to corresponding key parts of the vehicle body to construct the lightweight multi-material vehicle body in a composite connection mode.
As a further improvement of the scheme, the performance indexes of the dissimilar materials are torsional rigidity, bending rigidity, fatigue strength and crashworthiness.
As a further improvement of the scheme, the three-step experiment test comprises a shearing experiment, a stripping experiment, a hardness experiment and a fatigue experiment.
Further, the specific method for evaluating the connection performance in the third step is as follows:
a shearing experiment and a peeling experiment are carried out on the dissimilar material connecting structure to obtain a force-displacement curve of the dissimilar material connecting structure, and then the force-displacement curve is converted into a stress-strain curve through a data reduction technology; obtaining an elastic modulus E representing the connection rigidity from a linear elasticity stage of a stress-strain curve, and evaluating the rigidity performance of the dissimilar material connection structure through the elastic modulus E;
obtaining a maximum load P representing the connection strength from the peak value of the force-displacement curve, carrying out integral processing on the force-displacement curve to obtain an average load F representing the energy absorption characteristic, and evaluating the strength performance of the dissimilar material connection structure through the maximum load P;
a hardness distribution curve graph can be obtained by performing a hardness test on the dissimilar material connecting mechanism, and the surface hardness condition of the dissimilar material connecting mechanism is evaluated by the distribution curve;
the method comprises the steps of carrying out fatigue test on a dissimilar material connecting structure to obtain a corresponding fatigue life curve, obtaining the cycle number N of the dissimilar material connecting structure under different loads from the curve, and comprehensively evaluating the durability of the dissimilar material by combining hardness distribution and fatigue life.
The present invention also provides a dissimilar material connecting structure for an automobile, which includes:
the automobile body design method comprises the following steps of (1) preparing a base material A plate and a base material B plate, wherein the base material A plate and the base material B plate are two different materials for automobile body design;
a mechanical connecting member for connecting the base material A plate and the base material B plate;
the structural adhesive layer is coated between the base material plate A and the base material plate B, and the coating area of the structural adhesive layer is symmetrical relative to the mechanical connecting component and is used for connecting the base material plate A and the base material plate B with the mechanical connecting component;
the dissimilar material connecting structure for the automobile is designed by any one of the above design methods.
In a further improvement of the above aspect, the mechanical structural member is a rivet, and the base material a plate and the base material B plate are connected by a self-piercing riveting method.
In a further improvement of the above solution, the rivet is pressed from a thin plate to a thick plate, from a hard plate to a soft plate, and from a non-metal plate to a metal plate.
As a further improvement of the above, the self-piercing riveting method performs riveting by a SPR self-piercing riveting machine.
As a further improvement of the above scheme, the glue used in the structural glue layer is a structural glue for vehicles.
Further, the base material plate A and the base material plate B are made of aluminum alloy-steel or composite material-steel.
According to the dissimilar material connecting structure for the automobile, the dissimilar materials are connected by using the existing process equipment under the condition of not increasing a device through a riveting and gluing composite connecting method, the base material A plate and the base material B plate are connected through the combined action of the structural adhesive layer and the mechanical connecting member, so that the connecting strength is improved, and meanwhile, the fatigue life and the energy absorption characteristic of a part are improved.
The design method determines the material type and the performance index according to the technical route of the multi-material automobile body, utilizes a multidisciplinary multi-objective optimization design method to design the parameters of the connecting structure, evaluates the connecting performance through a material performance test, and finally applies the connecting design to each part of the automobile body so as to realize the light weight design of the multi-material automobile body.
Drawings
FIG. 1 is a schematic view of a connecting structure of dissimilar materials for an automobile according to the present invention;
FIG. 2 is a flow chart of a method for designing a dissimilar material for an automobile according to the present invention;
FIG. 3 is a flow chart of a multi-objective optimization method of the method for designing dissimilar materials for an automobile according to the present invention;
FIG. 4 is a force-displacement graph of a material of the present invention;
FIG. 5 is a stress-strain plot of a material of the present invention;
FIG. 6 is a schematic diagram of a hardness test of the material of the present invention;
FIG. 7 is a graph showing hardness distribution of the material of the present invention;
FIG. 8 is a graph of fatigue life of a material of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The invention relates to a dissimilar material connecting structure for an automobile, which comprises a base material plate A1, a base material plate B2, a mechanical connecting member 3 and a structural adhesive layer 4. And coating structural adhesive between the overlapped parts of the base material plate A and the base material plate B, and connecting the base material plate A and the base material plate B by using a self-piercing riveting process. The composite connection method overcomes the problems of low strength and reduced rigidity of self-piercing riveting relative to spot welding, and utilizes the structural adhesive to improve the connection strength of the joint surface and improve the fatigue performance and the energy absorption characteristic of the connecting part.
Referring to fig. 1, the base material a plate 1 and the base material B plate 2 are two different materials for automobile body design, and may be a connection of aluminum alloy-steel, composite material-steel or other types of materials. The mechanical connecting member 3 is a rivet, and connects the base material a plate 1 and the base material B plate 2 by a self-piercing riveting process. The direction of caulking is from the base material A plate 1 to the base material B plate 2 by press-fitting from a thin plate to a thick plate, from a hard plate to a soft plate, and from a non-metal plate to a metal plate. The structural adhesive layer is an automotive structural adhesive and is coated between the base material A plate 1 and the base material B plate 2, and the coating area is symmetrical relative to the rivet and used for improving the connection strength through the joint action of the rivet and the connection part, and meanwhile, the fatigue life and the energy absorption characteristic of the connection part are improved.
The riveting and gluing composite connection method realizes the connection of dissimilar materials by utilizing the existing process equipment under the condition of not increasing devices. Firstly, uniformly coating structural adhesive on the lap joint of a base material plate A1 and a base material plate B1 by using an automatic glue dispenser, and riveting by using mechanical connection equipment (SPR self-punching riveting machine) after the structural adhesive takes effect.
The invention also discloses a design method of the vehicle body dissimilar material connecting structure, which comprises the following steps:
(1) Connecting material type and performance index determination
From the structural performance of the whole vehicle body, key parts which influence the first-order torsional rigidity and bending rigidity of the vehicle body, the fatigue strength of the vehicle body and the collision resistance of the vehicle body are respectively found out by utilizing a sensitivity analysis method. Selecting the performance indexes (torsional rigidity, bending rigidity, fatigue strength and collision resistance) of the vehicle body structure, and determining the material type of the performance key part according to the technical route of the multi-material vehicle body.
Sensitivity analysis is a method of studying and analyzing the sensitivity of a system (or model) to changes in the state or output of the system to changes in system parameters or ambient conditions. Sensitivity analysis is often used in optimization methods to study the stability of the optimal solution when the raw data is inaccurate or changing. It is also possible to determine which parameters have a greater effect on the system or model by sensitivity analysis.
(2) Connection performance design of dissimilar material connection structure
After the type and performance index of the dissimilar material of the key component are determined, the specific model and structural parameters of the dissimilar material need to be determined and designed. The materials with the same material and different grades have different mechanical and mechanical properties, and the parameters of the same connecting structure are different, and the connecting properties are also different.
In order to more efficiently complete the structural parameter design of the dissimilar materials, the invention adopts a multi-objective optimization method which takes finite element simulation as drive and takes test design, approximate model construction, precision inspection and optimization algorithm as a core to complete the determination of the connecting structural performance of the dissimilar materials.
The structural parameters of the dissimilar materials are used as design variables, and the performance indexes of the dissimilar materials are used as constraints and targets.
Setting the material brand of the base material A as M A The material brand of the base material B is M B The width of the structural adhesive layer is L, and the thicknesses of the base materials A and B are T respectively A And T B I.e. M A 、M B 、L、T A And T B Is a design variable. When the connection performance of the material is examined, on the premise of ensuring the rigidity and the strength of the material, the connection structure is expected to have excellent energy absorption characteristics, durability and smaller quality.
And setting the properties of the dissimilar materials corresponding to the correlation properties as design response, namely the elastic modulus E, the maximum load P, the average load F and the fatigue life N of the dissimilar materials. And selecting the different associated performances as constraint and optimization targets according to the performance requirements of different modules of the vehicle body.
a: design of experiments
According to the structural parameter M of the material A 、M B 、L、T A And T B For design variables, the elastic modulus E and the maximum load P of the dissimilar materials are taken as constraints, and the mass W, the average load F and the fatigue life N are taken as optimization design targets. In order to economically and scientifically arrange the test content in the design space, 60 sample points are generated by adopting an optimal Latin hypercube design method (OLHS), and the response value of each sample point is obtained through finite element simulation.
b: approximate model construction and precision inspection
Because optimization is a process requiring repeated iteration, a large amount of time and resources are wasted by using a finite element simulation experiment, and the optimization efficiency is low, an approximate model is adopted to replace a real model to predict the response of an unknown part. As the fatigue life and the energy absorption characteristic are nonlinear responses, a Radial Basis Function (RBF) fitting response function is adopted, an RBF approximate model is constructed by using sample data, 10 groups of sample data are required to be generated for verifying the accuracy of the approximate model, and if the accuracy is not qualified, sample points are increased and the test design is carried out again.
Using statistical certainty coefficients (R) 2 ) And Root Mean Square Error (RMSE) to estimate the error between the approximation model and the sample point, the mathematical expression of which is as follows:
wherein, y i 、
The simulated value of the response of the verification point, the predicted value of the corresponding approximate model and the average value of the simulated value are respectively. When R is 2 The RMSE is less than 0.1 and is more than 0.9, which shows that the accuracy of the constructed RBF approximate model meets the requirement, and the RBF approximate model can replace finite element simulation for subsequent optimization design.
c: optimization algorithm optimization
The mathematical model of the multi-objective optimization design of the material performance is as follows:
and performing optimization design by using the RBF approximation model, performing optimization solution on the RBF approximation model by using an improved non-dominated sorting genetic algorithm (NSGA-II), performing finite element simulation verification on the optimized result, if the optimized result is qualified, performing next step by using the optimized solution obtained by optimization as a parameter value of material performance design, and if the optimized result is unqualified, performing retesting on optimization design variables and a target.
(3) Evaluation of connection Performance of dissimilar Material connection Structure
After the parameters of the dissimilar material connection structure are optimally designed to meet the performance requirements, corresponding experimental tests are required to evaluate the material performance, including a shearing test, a peeling test, a hardness test and a fatigue test.
Referring to fig. 4 and 5, a force-displacement curve of the dissimilar material connection structure can be obtained by performing a shearing experiment and a peeling experiment on the dissimilar material connection structure, and then the force-displacement curve is converted into a stress-strain curve by a data reduction technology. The elastic modulus E, which characterizes the stiffness of the connection, can be obtained from the linear elastic phase of the stress-strain curve. The peak force of the force-displacement curve can obtain the maximum load P representing the connection strength, and the average load F representing the energy absorption characteristic can be obtained by carrying out integration processing on the force-displacement curve.
Referring to fig. 6 and 7, a hardness distribution curve can be obtained by performing a hardness test on the dissimilar material connection structure, and the surface hardness of the dissimilar material connection structure can be evaluated according to the hardness distribution curve;
referring to fig. 8, a fatigue test is performed on the dissimilar material connection structure to obtain a corresponding fatigue life curve, the cycle number N of the dissimilar material connection structure under different loads can be obtained from the curve, and the durability (vibration resistance) of the dissimilar material connection structure is comprehensively evaluated by combining hardness distribution and the fatigue life.
After a shearing experiment, a stripping experiment, a hardness test and a fatigue test are carried out on the dissimilar material connecting structure, the corresponding elastic modulus E, the maximum load P, the average load F and the fatigue life N can be obtained, and the connecting performance of the dissimilar material connecting structure can be comprehensively evaluated in multiple aspects.
The specific evaluation tables are shown in table 1:
TABLE 1 typical connection characteristics and their applications
| Material properties | Correlation performance | Evaluation method |
| Modulus of elasticity | Rigidity | Shear test/peel test |
| Maximum load | Strength of | Shear test/peel test |
| Tensile curve | Energy-absorbing/safety (impact-resistant) | Shear test/peel test |
| Fatigue performance | Durable (anti-vibration) | Fatigue test/hardness test |
(4) Connection design and application whole vehicle body
After the test of the relevant connection performance experiment evaluation of the sample is completed, the structural parameters such as the specific material model, the plate thickness, the structural adhesive layer width and the like are obtained, and the structural parameters are applied to the corresponding key parts of the vehicle body to construct the multi-material vehicle body in a composite connection mode.
And establishing a first-order torsional rigidity and bending rigidity of the whole vehicle body, analyzing the fatigue strength of the vehicle body and analyzing the collision resistance of the vehicle body, and performing whole vehicle structure performance analysis and experimental test evaluation.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. A design method of a dissimilar material connecting structure for an automobile is characterized by comprising the following steps: the design method comprises the following steps:
the method comprises the following steps: determination of heterogeneous material types and performance indexes:
from the structural performance of the whole vehicle body, key parts influencing the performance indexes of the vehicle body dissimilar materials are respectively found out by using a sensitivity analysis method;
selecting performance indexes of different materials of the vehicle body, and determining the material type of the key component according to the multi-material vehicle body technical route;
step two: designing the connection performance of the dissimilar material connection structure: after the material type and the performance index of the key component are determined, the specific model and the structural parameters of the dissimilar materials are determined and designed;
the method comprises the following steps of (1) finishing connection performance determination of a dissimilar material connection structure by a multi-objective optimization method which takes structural parameters of dissimilar materials as design variables, performance indexes of the dissimilar materials as constraints and targets, finite element simulation as drive and a test design, approximate model construction and precision inspection and optimization algorithm as a core;
(1) Design of experiments
Setting the material brand of the base material A plate as M A The material brand of the base material B plate is M B The width of the structural adhesive layer is L, and the thicknesses of the base material A plate and the base material B plate are T respectively A And T B I.e. M A 、M B 、L、T A And T B Is a design variable;
setting the properties of the dissimilar materials corresponding to the correlation properties as design response, wherein the correlation properties comprise the elastic modulus E, the maximum load P, the average load F and the fatigue life N of the dissimilar materials; according to the performance requirements of different modules of the vehicle body, the structural parameters M of different materials A 、M B 、L、T A And T B For design variables, the elastic modulus E and the maximum load P of a dissimilar material are taken as constraints, and the mass W, the average load F and the fatigue life N are taken as optimization design targets;
generating 60 sample points by adopting an optimal Latin hypercube design method, and obtaining the response value of each sample point through finite element simulation;
(2) Approximate model construction and precision inspection
Adopting an approximate model to replace a real model to predict response at an unknown part, adopting a radial basis function to fit a response function, and constructing a radial basis function approximate model by using sample data to generate 10 groups of sample data;
and estimating the error between the approximate model and the sample point by using the statistic certainty coefficient and the root mean square error, wherein the mathematical expression is as follows:
wherein, y i 、
The simulated value of the response of the verification point, the predicted value of the corresponding approximate model and the average value of the simulated value are respectively; r 2 For the statistic certainty coefficient, RMSE is the root mean square error;
when R is 2 The RMSE is less than 0.1 and is more than 0.9, which indicates that the precision of the constructed radial basis function approximation model meets the requirement, thereby replacing finite element simulation for subsequent optimization design;
if the requirements are not met, increasing sample points and carrying out test design again;
(3) Optimization algorithm
The mathematical model of the multi-objective optimization design is as follows:
carrying out optimization design by using the constructed radial basis function approximation model, carrying out optimization solution on the radial basis function approximation model by using an improved non-dominated sorting genetic algorithm, carrying out finite element simulation verification on an optimized result, and if the optimized result meets the requirement, obtaining a parameter value for designing the performance of the dissimilar material connection structure by the optimization solution;
if the requirements are not met, optimizing design variables and targets, and carrying out test design again;
step three: evaluation of connection performance of dissimilar material connection structure: after the structural parameters of the dissimilar materials meet the performance requirements through optimized design, carrying out corresponding experimental tests to evaluate the connection performance of the dissimilar material connection structure, and evaluating the connection performance of the dissimilar material connection structure according to experimental results;
step four: the connection design applies the whole vehicle body: after the connection performance test evaluation test of the dissimilar material connection structure is completed, the structural parameters of the specific material model, the plate thickness and the structural adhesive layer width are obtained and applied to corresponding key parts of the vehicle body to construct the lightweight multi-material vehicle body in a composite connection mode.
2. The method of designing a dissimilar material connecting structure for an automobile according to claim 1, wherein: the performance indexes of the dissimilar materials are torsional rigidity, bending rigidity, fatigue strength and crashworthiness.
3. The method for designing a dissimilar material joining structure for an automobile according to claim 1, wherein: the test in the third step comprises a shearing test, a stripping test, a hardness test and a fatigue test.
4. A method for designing a dissimilar material connecting structure for an automobile according to claim 3, wherein: the specific method for evaluating the connection performance in the third step is as follows:
a shearing experiment and a stripping experiment are carried out on the dissimilar material connecting structure to obtain a force-displacement curve of the dissimilar material connecting structure, and the force-displacement curve is converted into a stress-strain curve through a data reduction technology; obtaining an elastic modulus E representing the connection rigidity from a linear elasticity stage of a stress-strain curve, and evaluating the rigidity performance of the dissimilar material connection structure through the elastic modulus E;
obtaining a maximum load P representing the connection strength from a peak value of a force-displacement curve, performing integral processing on the force-displacement curve to obtain an average load F representing the energy absorption characteristic, and evaluating the strength performance of the dissimilar material connection structure through the maximum load P;
a hardness distribution curve graph can be obtained by performing a hardness test on the dissimilar material connecting mechanism, and the surface hardness condition of the dissimilar material connecting mechanism is evaluated by the distribution curve;
the method comprises the steps of carrying out fatigue test on a dissimilar material connecting structure to obtain a corresponding fatigue life curve, obtaining the cycle number N of the dissimilar material connecting structure under different loads from the curve, and comprehensively evaluating the durability of the dissimilar material by combining hardness distribution and fatigue life.
5. A dissimilar material connection structure for an automobile, comprising:
the automobile body comprises a base material A plate and a base material B plate, wherein the base material A plate and the base material B plate are two different materials for automobile body design;
a mechanical connecting member for connecting the base material A plate and the base material B plate;
it is characterized in that the connecting structure of the dissimilar materials for the automobile further comprises
The structural adhesive layer is coated between the base material plate A and the base material plate B, the coating area of the structural adhesive layer is symmetrical relative to the mechanical connecting component, and the structural adhesive layer is used for connecting the base material plate A and the base material plate B with the mechanical connecting component;
the dissimilar material joining structure for an automobile is designed by the design method according to any one of claims 1 to 4.
6. The dissimilar material connecting structure for an automobile according to claim 5, wherein: the mechanical connecting component is a rivet, and the base material plate A and the base material plate B are connected through a self-piercing riveting method.
7. The dissimilar material joining structure for an automobile according to claim 6, wherein: the riveting sequence of the rivet is that the rivet is pressed into a thick plate from a thin plate, is pressed into a soft plate from a hard plate, and is pressed into a metal plate from a non-metal plate.
8. The dissimilar material connecting structure for an automobile according to claim 6, wherein: the self-piercing riveting method is characterized in that riveting is carried out through an SPR self-piercing riveting machine.
9. The dissimilar material connecting structure for an automobile according to claim 5, wherein: the glue used by the structural glue layer is structural glue for vehicles.
10. The dissimilar material joining structure for an automobile according to claim 5, wherein: the base material A plate and the base material B plate are made of aluminum alloy-steel or composite material-steel.
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