Thermomechanical transformation fatigue of SMA actuators
Additional Document Info
As Shape Memory Alloys (SMA) 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.
name of conference
Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics