Design method of dissimilar material connecting structure for automobile and connecting structure thereof

Abstract

The invention discloses a design method of a dissimilar material connecting structure for an automobile and a connecting structure thereof. The connecting structure comprises a base material plate A,a base material plate B, a mechanical connecting component and a structural adhesive layer. Structural adhesive is smeared between the lap joint portions of the base material plate A and the base material plate B, and meanwhile the base material plate A and the base material plate B are connected through a self-piercing riveting process. By means of the composite connecting method, the problems that the strength is obviously low and the rigidity is obviously reduced in the self-piercing riveting relative to spot welding are solved, and the connecting strength of the joint face is improved through the structural adhesive, and the fatigue performance and the energy absorption characteristic of a connecting part are improved. Furthermore, the vehicle body dissimilar material structure designmethod provided by the invention comprises the following steps: determining a material type and a performance index according to a multi-material vehicle body technical route; using a multidisciplinary and multi-objective optimization design method for parameter design of the connecting structure; evaluating the connecting performance through a material performance test; and finally, applying theconnecting design to all parts of a vehicle body, and then realizing multi-material vehicle body lightweight design.

Description

technical field [0001] The invention relates to a connection structure of dissimilar materials for automobiles in the field of automobiles, in particular to a design method for a connection structure of dissimilar materials for automobiles and a connection structure of dissimilar materials for automobiles. Background technique [0002] With the continuous improvement of automobile energy saving and emission reduction requirements, automobile lightweight technology has gradually developed, and multi-material body design has become the mainstream direction of development due to its excellent weight reduction effect. The increasing number of new materials used in automotive body design has resulted in the inability of traditional joining techniques to meet the requirements. At present, the main methods for connecting dissimilar materials include mechanical connection (bolt connection, self-piercing riveting, hot-melt self-tapping screw connection), resistance spot welding, lase...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of low strength and low rigidity, the invention provides a design method and connection structure of dissimilar materials used in automobiles

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