One-dimensional thermomechanical model for high strain rate deformation of austenitic shape memory alloys

Shape memory alloys (SMAs) exhibit the ability to absorb large dynamic loads and, therefore, are excellent candidates for structural components where impact loading is expected. While most models focus on the shape memory effect and/or pseudoelasticity of polycrystalline SMAs under quasi-static loading conditions; models for dynamic loading are limited. Many of the existing high strain rate models assume that the latent heat generated during deformation contributes to the change in the stress strain behavior during dynamic loading.. The driving force for phase transformation is also related to the phase front velocity, which is not considered in existing models for the constitutive relationship of SMAs at high strain rate deformation. In this paper, the relationship between the driving force for phase transformation and phase front velocity is discussed and a new one-dimensional rate-dependent model is established to model the dynamic loading behavior of SMAs. (C) 2017 Elsevier B.V. All rights reserved.