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Proceedings Paper

Shape memory alloys for damage-resistant composite structures
Author(s): Jeffrey S.N. Paine; Craig A. Rogers
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Paper Abstract

Shape memory alloy (SMA) materials such as nitinol have unique properties associated with the shape recovery effect and the material's phase changes that have been used in a variety of actuator and sensing applications. By embedding SMA elements into host composite materials, control or modification of the SMA hybrid composite's structural properties can be accomplished in-service, thereby increasing the hybrid composite's structural functionality. Utilizing the SMA's substantial capacity to dissipate strain energy to increase the hybrid composite's static functionality is addressed herein. Specific applications of SMA hybrid composites for improving polymer matrix composite material's impact damage resistance is presented. Hybridizing composites with nitinol improves their impact resistance because of nitinol's tremendous capacity to dissipate impact strain energy through the stress-induced martensitic phase transformation. The amount of impact damage is reduced and the material's resistance to impact perforation at various velocities is improved. The experimental response of nitinol hybrid composites to low and high velocity impact perforation is presented. The unique toughness and resistance to permanent deformation that is a result of the stress-induced martensitic phase transformation enables the nitinol to dissipate on the order of 4 times the strain energy of high alloy steel and 16 times that of many graphite/epoxy composites.

Paper Details

Date Published: 2 February 1995
PDF: 14 pages
Proc. SPIE 2427, Active Materials and Smart Structures, (2 February 1995); doi: 10.1117/12.200930
Show Author Affiliations
Jeffrey S.N. Paine, Virginia Polytechnic Institute and State Univ. (United States)
Craig A. Rogers, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 2427:
Active Materials and Smart Structures
Gary L. Anderson; Dimitris C. Lagoudas, Editor(s)

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