Crystal plasticity study of stress overshoot during high-strain rate deformation.

The stress overshoot (or elastic overshoot) and its mechanism during the high-strain rate deformation of metals are systematically and comprehensively investigated by crystal plasticity finite element simulation. The constitutive model by Austin and McDowell (Int J Plast 27(1):1–24, 2011) is adopted to simulate the crystal anisotropic properties and the deformation with a wide range of strain rates by introducing the individual slip system and a new mechanism of dislocation evolution. Based on the validated constitutive model, the effects of strain rate, temperature, and crystal orientation on the stress overshoot phenomenon are studied, and the corresponding physical mechanism is analyzed. The results show that both strain rate and temperature have significant influences on the stress overshoot and all crystal orientations show the stress overshoot. [ABSTRACT FROM AUTHOR]