CONSTITUTIVE MODELING AND FINITE ELEMENT APPROXIMATION OF B2-R-B19' PHASE TRANSFORMATIONS IN NITINOL POLYCRYSTALS
A. Sengupta and P. Papadopoulos Comp. Meth. Appl. Mech. Engrg., 198, pp. 3214-3227, (2009).

Abstract
A path-dependent constitutive model is proposed for the stress-induced phase transformation of Nitinol single crystals between austenite, rhombohedral and martensite phases. A multi-directional active search strategy is employed to resolve the path and state of the transformation. The resulting algorithm is implemented using a multi-scale finite element-based method which extends the applicability of the model to textured Nitinol polycrystals. Representative numerical simulations are included and show good agreement with experimental results.


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