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Proceedings Paper

Self thermal-plastic response of NiTi shape memory alloy fiber-actuated metal matrix composites
Author(s): William D. Armstrong; Torben Lorentzen
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Paper Abstract

The present work develops a quantitative theory of the self thermal-plastic response of NiTi shape memory alloy actuated metal matrix composite materials. Model calculations are compared with existing experimental data obtained from a testing procedure consisting of an initial room temperature, 5% tensile elongation process, and a subsequent room temperature to 120 degree(s)C unconstrained (external stress free) heating process. During the unconstrained heating process the composite fiber actuators attempt to recover pseudo-plastic strain imparted during the room temperature tensile prestrain process. As the temperature increases, the fiber stress-temperature state enters increasing phase transformation intensity, resulting in strong increases in fiber longitudinal tensile stress, matrix longitudinal compressive stress and composite compressive longitudinal external strain. Sufficient temperature brings the matrix stress state to the point of plastic yield. The composite then exhibits a very unusual, self thermal-plastic compression response, recovering approximately 2.2% strain.

Paper Details

Date Published: 11 July 2001
PDF: 11 pages
Proc. SPIE 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics, (11 July 2001); doi: 10.1117/12.432775
Show Author Affiliations
William D. Armstrong, SUNY/Binghamton (United States)
Torben Lorentzen, Riso National Lab. (Denmark)


Published in SPIE Proceedings Vol. 4333:
Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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