Fatigue life characterization of shape memory alloys undergoing thermomechanical cyclic loading

Olivier W. Bertacchini; Dimitris C. Lagoudas; Etienne Patoor

doi:10.1117/12.508207

13 August 2003 Fatigue life characterization of shape memory alloys undergoing thermomechanical cyclic loading

Olivier W. Bertacchini, Dimitris C. Lagoudas, Etienne Patoor

Proceedings Volume 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics; (2003) https://doi.org/10.1117/12.508207
Event: Smart Structures and Materials, 2003, San Diego, California, United States

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.

Citation Download Citation

Olivier W. Bertacchini, Dimitris C. Lagoudas, and Etienne Patoor "Fatigue life characterization of shape memory alloys undergoing thermomechanical cyclic loading", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); https://doi.org/10.1117/12.508207

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