Thermomechanical transformation fatigue of SMA actuators

Dimitris C. Lagoudas; Changcheng Li; David A. Miller; Lijian Rong

doi:10.1117/12.388225

14 June 2000 Thermomechanical transformation fatigue of SMA actuators

Dimitris C. Lagoudas, Changcheng Li, David A. Miller, Lijian Rong

Proceedings Volume 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics; (2000) https://doi.org/10.1117/12.388225
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

As SMAs gain popularity for use as large force actuators, one constitutive parameter that becomes particularly important is the thermomechanical fatigue life, in addition to maximum transformation strain and stability of actuation cycles. Even though the effect of thermal transformation cycles on the transformation characteristics of SMAs has been studied both experimentally and analytically, these studies have not been extended to high cycle levels related to the fatigue life. In this paper, a novel test frame and testing protocol are discussed to establish the transformation fatigue characteristics of SMAs under various loading conditions. Results are presented for the thermomechanical transformation fatigue life of SMA wire actuators under different applied stress levels and for different annealing conditions.

Citation Download Citation

Dimitris C. Lagoudas, Changcheng Li, David A. Miller, and Lijian Rong "Thermomechanical transformation fatigue of SMA actuators", Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); https://doi.org/10.1117/12.388225

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