Abstract
Shape memory alloys are known to exhibit shape memory effect and pseudo elastic effect. The alloys show two-way shape memory effect which is spontaneous deformation during thermal cycling without applied stress after appropriate thermomechanical cyclic loading. In this study, a polycrystalline finite element method which is able to take into account plastic slip and martensitic transformation is used to analyze the stress strain-temperature behavior under cyclic thermomechanical loading. Numerical results show that the origin of two-way shape memory effect is the local stress field induced by accumulation of plastic strain during thermomechanical cyclic loading.
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