Effect of Aspect Ratio and Boundary Conditions in Modeling Shape Memory Alloy Nanostructures with 3D Coupled Dynamic Phase-Field Theories

摘要: The behavior of shape memory alloy (SMA) nanostructures is influenced by strain rate and temperature evolution during dynamic loading. coupling between temperature, strain, essential to capture inherent thermomechanical in SMAs. In this paper, we propose a new 3D phase-field model that accounts for two-way mechanical thermal physics. We use the strain-based Ginzburg-Landau potential cubic-to-tetragonal phase transformations. variational formulation developed implemented isogeometric analysis framework overcome numerical challenges. have observed complete disappearance out-of-plane martensitic variant very high aspect ratio SMA domain as well presence three variants equal portions low domain. dependence different boundary conditions on microstructure morphology has been examined energetically. tensile tests rectangular prism nanowires, using displacement based loading, demonstrate effect pseudoelastic behavior. also higher rates, lower domains, resulting yield stress transformations occur at axial