Abstract
Martensitic phase transformation in NiTi shape memory alloys (SMA) can spread either homogenously or in localized martensitic transformation bands. Transformation band propagation is usually observed in particular loading modes (tension) and geometries of specimen (wires, thin ribbons). In this work, a well established NiTi SMA constitutive model is enhanced so that strain softening of the material response during stress induced phase transition is covered. A nonlocal integral averaging technique is adopted and the model is implemented into a finite element (FE) software. A simple validating simulation of a NiTi superelastic wire loaded in tension is performed.
Published Version
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