Various researchers have proposed simple analytic descriptions for the low cycle fatigue of pseudoelastic polycrystalline shape memory alloys with a variety of assumptions. Previously, experiments were presented detailing the low cycle fatigue of pseudoelastic polycrystalline NiTi wire subjected to uniaxial extension. These experiments detail the macroscopic thermo-mechanical interactions of the localized transient thermal response as measured through full field high-speed (60 frames/s) infrared imaging and laser extensometry. This permitted the tracking of the evolution of the strain localization and propagation of phase transformation.
These experiments are revisited, and an analysis of these results in view of known and postulated physical phenomena is presented. Special attention is paid to investigate trends and possible fundamental phenomena. Functional description of these phenomena are proposed. Results have implications on the modeling of unstable thermo-mechanical transformation behavior.
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