In this folder, there are two UMATs available for you to simulate the constituive behaviours of SMAs using finite element software Abaqus.
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Finite_Strain_SMA_UMAT.for, this file is the UMAT to simulate SMAs undergoing large deformations. See reference paper for the detail. Xu, Lei, Theocharis Baxevanis, and D. C. Lagoudas. "A three-dimensional constitutive model for the martensitic transformation in polycrystalline shape memory alloys under large deformation." Smart Materials and Structures 28.7 (2019): 074004. https://doi.org/10.1088%2F1361-665x%2Fab1acb
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SMA-TRIP.for, this file is the UMAT that simulates the constitutive behaviour of SMAs considering the transformation-induced plasticity(TRIP) and the two-way shape memory effect(TWSME), see the following paper as reference. Lei Xu, Alexandros Solomou, Theocharis Baxevanis, Dimitris Lagoudas, Finite strain constitutive modeling for shape memory alloys considering transformation-induced plasticity and two-way shape memory effect, International Journal of Solids and Structures,2020. https://doi.org/10.1016/j.ijsolstr.2020.03.009.
A detailed tutorial will be provided soon. If you have any questions at this moment, feel free to send emails to sdf007xulei@gmail.com for help. You are highly welcomed by the authors to use these open-resource codes for your non-commericial usage, and please cite the aforementioned papers accordingly.