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Proceedings Paper

Fatigue life characterization of shape memory alloys undergoing thermomechanical cyclic loading
Author(s): Olivier W. Bertacchini; Dimitris C. Lagoudas; Etienne Patoor
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Paper Abstract

This paper presents a study on the fatigue life of shape memory alloy actuators undergoing thermally induced martensitic phase transformation under various stress levels. A microstructural study characterizing specific damage patterns is conducted in the current work. A highly stressed state with formation of different types of microcracks has been observed, showing a superficial micro cracking, responsible for the growth of circular cracks localizing the failure of the specimens. The influence of the interactions between the micro cracking pattern and the corrosion occurrence is also studied. Finally, a spallation oxidation occurring at the surface of the actuator, which damages its properties, is also investigated. The failure pattern observed provides information necessary to introduce a correction to the classical Wohler curve for fatigue life of a material undergoing cyclic loading.

Paper Details

Date Published: 13 August 2003
PDF: 13 pages
Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.508207
Show Author Affiliations
Olivier W. Bertacchini, Texas A&M Univ. (United States)
Dimitris C. Lagoudas, Texas A&M Univ. (United States)
Etienne Patoor, LPMM, CNRS-Ecole Nationale Superieure d'Arts et Metiers (France)

Published in SPIE Proceedings Vol. 5053:
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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