Experimental and Numerical Formability Analysis of AZ31 and ZE10 Sheets

Abstract

Experimentally and numerically obtained mechanical responses of Nakazima-type sheet forming tests for the magnesium alloys ZE10 and AZ31 at elevated temperature (200°C) are explored. The results from the experiments reveal sufficient ductility at the prescribed test temperature allowing sheet forming processes. The material's anisotropy as well as the distortional character of hardening is confirmed. Differences in terms of strain paths during the forming experiments between the two materials are quantified. The corresponding numerical responses are obtained employing a suitable plasticity model based on tensor transforms. In addition, for predicting limit conditions of the forming process, the localisation criterion by Marciniak and Kuczynski is adopted. The constitutive model together with the localisation criterion is implemented in a finite element framework based on a fully implicit time integration scheme. The observed differential hardening during plastic deformation is predicted. The reasonably good agreement between the responses of the model and the respective experiments indicate the predictive capabilities of the implemented model for the considered magnesium alloys. The influence of the model parameter identification strategy is demonstrated.