High Strain-Rate, Small Strain Response of a NiTi Shape-Memory Alloy

[+] Author and Article Information
Sia Nemat-Nasser, Jeom Yong Choi, Wei-Guo Guo, Jon B. Isaacs

Center of Excellence for Advanced Materials, Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0416

Minoru Taya

Center for Intelligent Materials and Systems, Department of Mechanical Engineering, University of Washington, Box 352600, Seattle, WA 98195-2600

J. Eng. Mater. Technol 127(1), 83-89 (Feb 22, 2005) (7 pages) doi:10.1115/1.1839215 History: Received February 04, 2004; Revised September 23, 2004; Online February 22, 2005
Copyright © 2005 by ASME
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Schematic diagram of the split Hopkinson bar with a pulse shaper
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Time-variation of strain without a pulse shaper
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Variation of stress and strain rate as a function of strain in a test without a pulse shaper
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A comparison of incident and transmitted pulses obtained using (a) no pulse shaper; (b) a square plate with a central hole pulse shaper; and (c) a tube pulse shaper
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Stress and strain rate as functions of strain for indicated pulse shapers
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Time-variation of strain, obtained using a copper-tube pulse shaper
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A typical dynamic stress–strain relation for NiTi shape-memory alloy loaded at an average strain rate of about 1080/s
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Dynamic stress–strain relations for NiTi shape-memory alloy at indicated strain rates
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Estimated temperature change as a function of strain rate; specimens denoted as a “Single Test” are loaded only once, whereas those denoted as a “Repeated Test” have been deformed several times
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Quasi-static stress–strain curves at room temperature
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Transition stress of stress-induced martensite formation as a function of strain rate
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Variation of the work-hardening rate with the strain rate in the stress-induced martensite formation regime




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