성형 효과를 고려한 자체 박판부재의 붕괴거동해석

Abstract

In this paper, collapse analysis is performed under the quasi-static loading condition using a finite element limit method in order to identify the collapse behavior of an auto-body structure such as an S-rail. The S-rail is manufactured with the sheet metal forming process. The formed structure contains prehistoric effects such as residual stress, work hardening, non-uniform thickness distribution and geometric changes induced from the forming process. The collapse analysis of an S-rail considering the forming effects leads to different results from that without considering such effects. The present study deals with the collapse analysis of the S-rail simulated from the analysis of sheet metal forming, trimming and springback. The collapse properties such as the collapse load, the collapse mode and the energy absorption are calculated and compared with the S-rail model for the forming effects. It is fully demonstrated that the design of an auto-body structure needs to consider the forming effects for a proper evaluation of the load-carrying capacity and the deformation of the formed structures.