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Proceedings Paper

Shape memory alloy actuation for active tuning of composite shafts
Author(s): Jeanette J. Epps; Ramesh Chandra
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Paper 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.

Paper Details

Date Published: 1 May 1996
PDF: 17 pages
Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); doi: 10.1117/12.239057
Show Author Affiliations
Jeanette J. Epps, Univ. of Maryland/College Park (United States)
Ramesh Chandra, Univ. of Maryland/College Park (United States)


Published in SPIE Proceedings Vol. 2717:
Smart Structures and Materials 1996: Smart Structures and Integrated Systems
Inderjit Chopra, Editor(s)

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