关键词: 复合材料；结构优化；有限元；Pamcrash；塑料尾门；滑台试验

Abstract: In the structural design of the automobile tailgate, the tailgate door lock and its retainer should meet the structural functionality and integrity under high-speed crash load in the sled test. This paper takes the composite tailgate as the research object, focuses on the high-speed material properties of the composite material, by establishing the finite element simulation analysis model of the composite tailgate sled test. The accuracy of the simulation model of the composite tailgate sled was validated to the test results, and the fracture performance of the composite tailgate, especially the tailgate lock and its retainer under high strain rate was analyzed under high-speed conditions. Finally, based on the accurate simulation analysis model of the tailgate sled test, taking into account the process feasibility of composite materials, an optimization scheme to strengthen the weak area of the composite tailgate is proposed, and the reliability of the optimization scheme was also verified by experiments. The finite element simulation analysis and optimization method using the sled test described in this paper can efficiently and accurately solve the problem of local cracking of the composite tailgate in the sled test.

Key words: Composite material; Structure optimization; FEM; Pamcrash; Plastic tailgate; Sled test