Computational modeling of dynamic mechanical properties of pure polycrystalline magnesium under high loading strain rates

¹ School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
² Department of Chemical and Materials Engineering, University of Nevada, Reno, Reno, Nevada 89557, USA

^a Corresponding author: Qizhen.li@wsu.edu

Published online: 7 September 2015

Abstract

Computational simulations were performed to investigate the dynamic mechanical behavior of pure polycrystalline magnesium under different high loading strain rates with the values of 800, 1000, 2000, and 3600 s⁻¹. The Johnson-Cook model was utilized in the simulations based on finite element modeling. The results showed that the simulations provided well-matched predictions of the material behavior such as the strain rate-time history, the stress-strain curve, and the temperature increase. Under high loading strain rates, the tested material experienced linear strain hardening at the early stage of plastic deformation, increased strain hardening at the intermediate plastic deformation region, and decreased strain hardening at the region before fracture. The strain hardening rates for the studied high loading strain rate cases do not vary much with the change of strain rates.