|About this Abstract
||NUMISHEET 2021: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||Characterization of Kinematic Hardening Using Two-stage Hydraulic Bulge Test
||Rémi Lafarge, Matthias Lenzen, Marion Merklein, Alexander Brosius
|On-Site Speaker (Planned)
In processes with nonlinear strain paths, kinematic hardening plays a major role and different approaches have been introduced to calculate parameters for complex hardening models. In this paper, a new concept using a recently introduced two-stage hydraulic bulge test is proposed. The set-up consists of a modified bulge test where the sheet undergoes an equibiaxial loading followed by a near plane strain loading. Due to the non-linearity of the strain path, kinematic hardening influence the strain rate direction during the second part of the loading. With 3D Digital Image Correlation (DIC), strain and curvature are measured. Stress values can also be derived from the curvature using membrane theory. The resolution of the stress driven problem enables the calculation of the strain for a given set of material parameters. The possibility of fitting the hardening parameter by comparing the calculated and measured strain is investigated using numerical and real experiments.
||Definite: At-meeting proceedings