Tension-Compression Tests for Springback Prediction of AHS Steel Using the Yoshida-Uemori Model

摘要

In sheet metal forming process of automotive parts, the springback effect is crucial, in particular, for advanced high strength (AHS) steels. Most structural components of new vehicles show very complex shapes that require multi-step forming procedures. Therefore, finite element (FE) simulation has been often used to describe plastic deformation behavior and springback occurrence of formed metal sheets. Recently, the kinematic hardening Yoshida-Uemori model has showed great capability for predicting elastic recovery of material. In this work, the AHS steel grade JSC780Y was investigated, in which tension-compression tests were carried out. From resulted cyclic stress-strain responses, material parameters were identified using different fitting methods. Determined model parameters were firstly verified by using simulations of 1-element model. The most appropriate parameter set was then obtained. Finally, a Hat-Shape forming test was performed and springback was predicted and compared with experimental results.