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20 July 1998 Initiation and propagation of localized deformation in the pseudoelastic response of NiTi
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The evolution of inhomogeneous deformation in a NiTi shape memory alloy under uniaxial tension is studied both experimentally and analytically. Interesting features of stress-induced phase transformation fronts are observed in experiments of NiTi strips. The nucleation of a new phase occurs as a sharp band of localized strain inclined at 55° to the axis of loading. This angle agrees with a rather well-known hand calculation based on continuum plasticity. Under prescribed end displacement the new phase then spreads either by steady-state propagation of angled transition fronts or by an alternating pattern of finger-like features. These features are successfully captured by finite element analyses with a special trilinear stress-strain model having an intermediate unstable branch. It is a relatively simple continuum-based approach which captures the interplay of the material instability and more global structural constraints.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John A. Shaw and Stelios Kyriakides "Initiation and propagation of localized deformation in the pseudoelastic response of NiTi", Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998);

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