关键词: 复合材料加强件；扭转刚度；轻量化；接头

Abstract: The design of the body joint has a great influence on the torsional stiffness performance of the passenger car body, and the lightweight design of the joint is one of the difficulties in the design of the body structure. In this paper, an optimization method for lightweight design of body joints based on composite reinforcements is proposed. First of all, through the torsional stiffness of the body-in-white sensitive C-column joints, floor wheel cover joints, D-column joints, D-column joints under the use of composite reinforcement effect comparison, it is concluded that the costperformance ratio of using composite reinforcement at the joint position of floor wheel cover is optimal. Then the joint size from X direction, Y direction and the different arrangement of glue are optimized, the optimal scheme of lightweight joint is found under the condition of equivalent performance. This method is applied to the body joint of a sport utility vehicle (SUV) and under the condition of ensuring the same body performance, the weight of the joint using composite reinforcement scheme is reduced by 16.7% compared with the original sheet metal scheme. At the same time, the method proposed in this paper can also be applied to other cavity structures of the body, which can improve the stiffness and lightweight level of the body.

Key words: composite structural reinforcements; torsional stiffness; lightweight; joint