Abstract:

An algorithm was proposed based on KMAS sheet forming analysis platform to simulate the trimming spring back in the thin sheet forming by the finite element method. The mesh relocation in the trimming region was achieved by the selfadaptive template of trimmed element. The deformation field data mapping from the old to the new mesh was realized by interpolation of the shape fuction. A simplified linear elastic unloading model was built based on the static implicit algorithm to predict the effect of trimming spring back. The numerical simulation on the international standard test part, an automotive underbody stretch crossmember, which was prorided by NUMISHEET 2005, was in good agreement with experimental result,validating the effectiveness of the presented algorithm.

Key words: material synthesis and processing technology, thin sheet forming, trimming springback, deformation data mapping, linear elastic unloading, static implicit algorithm