3D Finite Element-Based Multiphysics Simulation of a Shape Memory Alloy Hybrid Composite Module

The paper studies shape memory alloy hybrid composites (SMAHCs), which use shape memory alloy (SMA) wires to produce shape transformation. It notes that existing models often struggle to represent thermomechanical coupling and to match experimental results comprehensively. To address this, the authors present a coupled 3D finite element simulation approach that integrates mechanical, thermal, and electromagnetic solvers in ANSYS LS-DYNA. The model uses a micromechanical constitutive formulation to represent the SMA’s thermomechanical phase transformation. A key modeling step is how the SMA material state is initialized: the method prescribes a martensitic pre-strain by running a preceding simulation where an initially scaled SMA wire is mechanically loaded and stretched to its nominal length, enabling partial detwinning. Joule heating from the SMA wires, varying mechanical loads, and ambient temperature are included. The simulation results are validated against experimental data and compared with a fully coupled transient staggered scheme. The authors report good qualitative agreement, including the characteristic hysteresis of actuator deflection versus temperature, and deflections that are the right order of magnitude though slightly outside the stated 95% experimental confidence interval.