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Proceedings Paper

Torsional behavior of shape memory alloys
Author(s): Andrew C. Keefe; Gregory Paul Carman; A. Peter Jardine
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Paper Abstract

This study investigates the properties of TiNi and TiNi-Cu (K- alloy) Shape Memory Alloys and their behavior in torsion (uniaxial) and combined tension-torsion (biaxial). Test results include torque versus angle curves and recovery torque versus pretwist for both uniaxial and biaxial loading. Preliminary results for low cycle fatigue are also presented. The wall thickness of the torque tube influences all of these curves considerably due to the gradation of stresses and strains through the thickness. All test data presented in this paper is for moderate torques where maximum shear strains are below 3.5% and as such represent an actuator capable of long fatigue life, based on previous experimental data for wire systems. A theoretical model for recovery torque is also described.

Paper Details

Date Published: 20 July 1998
PDF: 10 pages
Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998); doi: 10.1117/12.316849
Show Author Affiliations
Andrew C. Keefe, Univ. of California/Los Angeles (United States)
Gregory Paul Carman, Univ. of California/Los Angeles (United States)
A. Peter Jardine, Northrop Grumman Corp. (United States)

Published in SPIE Proceedings Vol. 3324:
Smart Structures and Materials 1998: Smart Materials Technologies
Manfred R. Wuttig, Editor(s)

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