Abstract
In this paper, the evolution of plastic strains and Two-Way Shape Memory (TWSM) effect with respect to thermally induced cyclic phase transformation is investigated for NiTi shape memory alloys. It is observed by Bo and Lagoudas (1997b) that the accumulation of plastic strains continues beyond a large number of cycles (2000), while the TWSM is saturated and remains stable after a few hundred transformation cycles, depending on the magnitude of the applied load. Motivated by the experimental observations, evolution equations for the accumulation of plastic strains and plastically related back and drag stresses, which govern the evolution of TWSM, are proposed. Model predictions are successfully compared with experimental data.
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