Development of a shear test to determine the cyclic behaviour of sheet materials

摘要

In many industrial stamping operations, the sheet material is subject to a series of loading and reverse loading cycles. In order to accurately predict the outcome of such forming processes, numerical simulation models rely on advanced constitutive models to rigorously reproduce the cyclic work hardening behaviour of the sheet material. The objective of this research was to develop a testing facility that is capable of generating the experimental stress-strain data of sheet materials when they are subjected to cyclic shearing loads. A suitable specimen geometry and a corresponding loading fixture were designed and fabricated. Cyclic shear tests were successfully carried out on four different grades of automotive sheet steel using this new testing fixture mounted in a universal testing machine. The experimental data thus generated can be used to determine the material parameters in advanced constitutive models, in order to virtually simulate metal forming operations and the subsequent spring back.