Actuator lifetime predictions for Ni60Ti40 shape memory alloy plate actuators

Robert Wheeler; Cade Ottmers; Brett Hewling; Dimitris Lagoudas

doi:10.1117/12.2219514

18 April 2016 Actuator lifetime predictions for Ni₆₀Ti₄₀ shape memory alloy plate actuators

Robert Wheeler, Cade Ottmers, Brett Hewling, Dimitris Lagoudas

Proceedings Volume 9800, Behavior and Mechanics of Multifunctional Materials and Composites 2016; 98000E (2016) https://doi.org/10.1117/12.2219514
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

Abstract

Shape memory alloys (SMAs), due to their ability to repeatedly 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 of predicting actuator lifetimes. Previous efforts have been effective at predicting actuator lifetimes for isobaric dogbone test specimens. This study builds on previous work and investigates the actuation fatigue response of plate actuators with various stress concentrations through the use of digital image correlation and finite element simulations.

Citation Download Citation

Robert Wheeler, Cade Ottmers, Brett Hewling, and Dimitris Lagoudas "Actuator lifetime predictions for Ni₆₀Ti₄₀ shape memory alloy plate actuators", Proc. SPIE 9800, Behavior and Mechanics of Multifunctional Materials and Composites 2016, 98000E (18 April 2016); https://doi.org/10.1117/12.2219514

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