Shape memory alloy actuation for active tuning of composite shafts

Jeanette J. Epps; Ramesh Chandra

doi:10.1117/12.239057

1 May 1996 Shape memory alloy actuation for active tuning of composite shafts

Jeanette J. Epps, Ramesh Chandra

Proceedings Volume 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems; (1996) https://doi.org/10.1117/12.239057
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

This paper present an experimental-theoretical study on the active tuning of a supercritical composite shaft with shape memory alloy (SMA) wires. To predict the constrained recovery stress in SMA wires, free SMA wires were tested for their thermo-mechanical characteristics, such as the stress-strain curves at different temperatures, the recovery strain at different temperatures and the change in the phase transformation temperatures at different applied stresses. These thermo-mechanical properties were used to determine the coefficients needed in the description of a typical constitutive model for SMA. The predicted value of recovery stress was experimentally correlated. A finite element analysis of a supercritical composite shaft with SMA wires inserted in embedded sleeves was conducted to predict the rotating natural frequencies at a specified recovery force. A 23% increase in the fundamental frequency of a non-rotating composite shaft with 7.4% volume fraction of SMA wires embedded is shown.

Citation Download Citation

Jeanette J. Epps and Ramesh Chandra "Shape memory alloy actuation for active tuning of composite shafts", Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); https://doi.org/10.1117/12.239057

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