2014/03/22 by R. Dhote, H. Gomez, Dhote, R. +8
Engineering · Materials Science · Physics and Astronomy · #Composite Structure Analysis and Optimization #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Shape Memory Alloy Transformations #Solidification and crystal growth phenomena #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1403.5608
22 pages, 14 figures
openalex publication_date 2014/03/22 · arxiv created 2014/06/28 · arxiv updated 2014/07/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
The behavior of shape memory alloy (SMA) nanostructures is influenced by strain rate and temperature evolution during dynamic loading. The coupling between temperature, strain and strain rate effects is essential to capture inherent thermo-mechanical behavior in SMAs. In this paper, we propose a new fully coupled thermo-mechanical 3D phase-field model that accounts for two-way coupling between mechanical (or structural) and thermal physics. The 3D model provides a realistic description of the properties of SMAs nanostructures. We use the strain-based Ginzburg-Landau potential for cubic-to-tetragonal phase transformations. The variational formulation of the developed model is implemented in the isogeometric analysis framework to overcome numerical challenges. We have observed a complete disappearance of the out-of-plane martensitic variant in a very high aspect ratio SMA domain as well as the presence of three variants in equal portions in a low aspect ratio SMA domain. The sensitive dependence of different boundary conditions on the microstructure morphology has been examined energetically. The tensile tests on a rectangular prism nanowires, using the displacement based loading, demonstrate the shape memory effect and pseudoelastic behavior. We have also observed that higher strain rates, as well as the lower aspect ratio domains, resulting in high yield stress and phase transformations occur at higher stress during dynamic axial loading. The simulation results using the developed model are in qualitative agreement with the numerical and experimental results from the literature.