FE Analysis of Springback in Hat-Bending with Consideration of InitiaI Anisotropy and the Bauschinger Effect

摘要

This paper demonstrates how strongly the analytical prediction of springback is influenced by the description of material's stress--strain responses appearing during stress reversal. For the finite element analysis of hat-bending and the subsequent springback, three different types of constitutive models, i.e., (a) isotropic hardening (IH) model, (b) linearly kinematic hardening (LKH) model, and (c) combined hardening (IH+LKH+non--linearly kinematic hardening [NLKH]) model, were employed. When using the combined hardening model, the calculated sheet geometries showed the excellent agreement with the experimental results, while the predictions by both the IH and LKH models under- estimate the springback.