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Proceedings Paper

Initiation and propagation of localized deformation in the pseudoelastic response of NiTi
Author(s): John A. Shaw; Stelios Kyriakides
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Paper Abstract

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.

Paper Details

Date Published: 20 July 1998
PDF: 12 pages
Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998); doi: 10.1117/12.316850
Show Author Affiliations
John A. Shaw, Univ. of Michigan (United States)
Stelios Kyriakides, Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 3324:
Smart Structures and Materials 1998: Smart Materials Technologies
Manfred R. Wuttig, Editor(s)

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