%0 journal article
%@ 1960-6206
%A Nebebe Mekonen, M., Bohlen, J., Steglich, D., Letzig, D.

%D 2009
%J International Journal of Material Forming
%N S1
%P 53-56 
%R doi:10.1007/s12289-009-0437-5
%T Mechanical Characterisation of Mg Alloys and Model Parameter Identification for Sheet Forming Simulations
%U https://doi.org/10.1007/s12289-009-0437-5
S1 
%X The understanding of forming process of Mg alloys at elevated temperatures can be enhanced with help of numerical simulations. As such a constitutive model was implemented in a finite element frame work. For calibration of the constitutive response mechanical characterisation of Mg alloys were performed. The mechanical characterisation employed uni-axial tensile tests of two Mg alloys, namely AZ31 and ZE10 in heat treated condition, at room temperature (RT) and 200°C. The uni-axial tensile test at 200°C compared to those at RT revealed an increase in ductility but also a decrease in yield strength. Planar anisotropy was recorded in terms of differences in yield stresses as well as r-values between three different material orientations. It was also observed that the planar anisotropy is affected by the test temperatures. The r-values, especially at 200°C, found to be dependent on the accumulated strain. This observation is contrary to the usual practice of assuming a constant r-value. Using the test results the constitutive model parameters were identified.