Bending angle correction regarding sheet thickness

Abstract

V-bending tests realized according to VDA 238-100 standard allow determining the bending angles (before and after springback) of a steel sheet of thickness th0 and the fracture strain in plane strain. The aim of the present study is to propose a correction law for bending angle before springback allowing to predict the angle corresponding to another sheet thickness th (the bending angle increases with the decreasing thickness). This correction allows comparing steels bendability even if experiments are performed with different sheet thicknesses. Another interest is to be able to predict bending angles for sheet thickness mentioned in customer products specifications.