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21 July 2004 Energy absorption material using buckling strength of shape memory alloy plate
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The buckling behavior of TiNi Shape Memory Alloy (SMA) plates is evaluated numerically and experimentally with aim of using TiNi as an Energy Absorption (EA) material. To this end, we performed FEM analysis for TiNi plates of several thickness and length. The present analytical study shows promising result of using TiNi as an EA material. This is confirmed by the experiment work. The post-buckling shape and the load-displacement relationship are quite different from those of conventional materials such as aluminum and steel. Post-buckling strength of the conventional materials decreases gradually with increase in applied loading (or deformation). This reduction in the load bearing capacity at higher loads is attributed to the localized high strain in deformed specimen under compression while the majority of the specimen volume deform at modest strain. If this localized high strain is avoided and high straining can be made more uniformly in the entire specimen under compression load, then such a plate is expected to exhibit large energy absorption, i.e. a new EA material. The present study reveals that the energy absorption in TiNi plate under compression is 3 times larger than that of aluminum plate for the same level of compression loading.
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Shunji Suzuki, Yuta Urushiyama, and Minoru Taya "Energy absorption material using buckling strength of shape memory alloy plate", Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004);

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