Shape memory alloys for damage-resistant composite structures

Jeffrey S.N. Paine; Craig A. Rogers

doi:10.1117/12.200930

2 February 1995 Shape memory alloys for damage-resistant composite structures

Jeffrey S.N. Paine, Craig A. Rogers

Proceedings Volume 2427, Active Materials and Smart Structures; (1995) https://doi.org/10.1117/12.200930
Event: Symposium on Active Materials and Smart Structures: Society of Engineering Science 31st Annual Meeting, 1994, College Station, TX, United States

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.

Citation Download Citation

Jeffrey S.N. Paine and Craig A. Rogers "Shape memory alloys for damage-resistant composite structures", Proc. SPIE 2427, Active Materials and Smart Structures, (2 February 1995); https://doi.org/10.1117/12.200930

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