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Proceedings Paper

Experimental observation of high-rate buckling of thin cylindrical shape-memory shells
Author(s): Sia Nemat-Nasser; Jeom Yong Choi; Jon B. Isaacs; David W. Lischer
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Paper Abstract

We investigate the buckling behavior of thin cylindrical shape-memory shells at room temperature, using a modified split Hopkinson bar and an Instron hydraulic testing machine. The quasi-static buckling response is directly observed using a digital camera with a close-up lens and two back mirrors. A high-speed Imacon 200 framing camera is used to record the dynamic buckling modes. The shape-memory shells with an austenite-finish temperature less than the room temperature, buckle gradually and gracefully in quasi-static loading, and fully recover upon unloading, showing a superelastic property, whereas when suitably annealed, the shells do not recover spontaneously upon unloading, but they do so once heated, showing a shape-memory effect. The gradual and graceful buckling of the shape-memory shells is associated with the stress-induced martensite formation and seems to have a profound effect on the unstable deformations of thin structures made from shape-memory alloys.

Paper Details

Date Published: 16 May 2005
PDF: 8 pages
Proc. SPIE 5761, Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics, (16 May 2005); doi: 10.1117/12.600238
Show Author Affiliations
Sia Nemat-Nasser, Univ. of California/San Diego (United States)
Jeom Yong Choi, Univ. of California/San Diego (United States)
Jon B. Isaacs, Univ. of California/San Diego (United States)
David W. Lischer, Univ. of California/San Diego (United States)


Published in SPIE Proceedings Vol. 5761:
Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics
William D. Armstrong, Editor(s)

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