Variational Reduced-Order Modeling of Thermomechanical Shape Memory Alloy Based Cooperative Bistable Microactuators

This article presents the formulation and application of a reduced-order thermomechanical finite strain shape memory alloy (SMA)-based microactuator model for switching devices under thermal loading by Joule heating. The is cast in generalized standard material framework with an extension thermomechanics. proper orthogonal decomposition (POD) utilized capturing reduced basis from precomputed element method (FEM) full-scale model. modal coefficients are computed optimization underlying incremental potential, weak form mechanical problem formulated format. (ROM) compared FEM model, exemplary mean absolute percentage errors displacement temperature 0.973% 0.089%, respectively, speedup factor 9.56 single SMA-based actuator. ROM presented tested cooperative beam-like actuators. Furthermore, cross-coupling effects bistability phenomenon microactuators investigated.