Recent developments on SMA actuators: predicting the actuation fatigue life for variable loading schemes

Robert W. Wheeler; Dimitris C. Lagoudas

doi:10.1117/12.2263502

10 April 2017 Recent developments on SMA actuators: predicting the actuation fatigue life for variable loading schemes

Proceedings Volume 10172, A Tribute Conference Honoring Daniel Inman; 101720E (2017) https://doi.org/10.1117/12.2263502
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2017, Portland, Oregon, United States

Abstract

Shape memory alloys (SMAs), due to their ability to repeatably recover substantial deformations under applied mechanical loading, have the potential to impact the aerospace, automotive, biomedical, and energy industries as weight and volume saving replacements for conventional actuators. While numerous applications of SMA actuators have been flight tested and can be found in industrial applications, these actuators are generally limited to non-critical components, are not widely implemented and frequently one-off designs, and are generally overdesigned due to a lack of understanding of the effect of the loading path on the fatigue life and the lack of an accurate method for predicting actuator lifetimes. In recent years, multiple research efforts have increased our understanding of the actuation fatigue process of SMAs. These advances can be utilized to predict the fatigue lives and failure loads in SMA actuators. Additionally, these prediction methods can be implemented in order to intelligently design actuators in accordance with their fatigue and failure limits. In the following paper, both simple and complex thermomechanical loading paths have been considered. Experimental data was utilized from two material systems: equiatomic Nickel-Titanium and Nickelrich Nickel-Titanium.

Citation Download Citation

Robert W. Wheeler and Dimitris C. Lagoudas "Recent developments on SMA actuators: predicting the actuation fatigue life for variable loading schemes", Proc. SPIE 10172, A Tribute Conference Honoring Daniel Inman, 101720E (10 April 2017); https://doi.org/10.1117/12.2263502

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