2006 年 47 巻 540 号 p. 64-68
In sheet forming simulations using the finite-element method (FEM), the elastic deformation of tools during the forming process can play an important role, particularly when an accurate analysis is required to predict complex defects such as surface deflection due to the springback phenomenon. For an accurate springback simulation, a static explicit approach can be regarded as one of the most suitable methods. However, in most studies that have been made for FEM simulations coupled with deformable tools, a dynamic explicit approach has been applied; thus, accurate springback predictions have been rarely obtained. In this study, the authors propose an algorithm to deal with the contact between a sheet and deformable tools, which is specialized for coupling effects between nonlinear-elastoplastic and linear-elastic bodies in the framework of a static explicit time integration scheme. Stamping experiments on square cup deep drawing with a flexible blank holder were also conducted, and the results were compared with numerical ones. The results confirmed the ability of the coupled simulations with the proposed algorithm to predict the effect of tool elasticity on the behavior of the sheet.