Vol. 1, No. 2, 2006

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ISSN: 1559-3959
Temperature dependence of a \niti/ shape memory alloy's superelastic behavior at a high strain rate

Weinong Chen and Bo Song

Vol. 1 (2006), No. 2, 339–356
Abstract

The temperature dependence of the dynamic compressive stress-strain behavior of a NiTi shape memory alloy (SMA) has been determined at a strain rate of 4.35 × 102 s1 with a split Hopkinson pressure bar (SHPB) modified for obtaining the dynamic stress-strain loops at constant strain rates. The environmental temperature was varied from 0 to 50 C, where the SMA exhibits superelastic behavior through stress-induced martensite (SIM). Experimental results show that both the loading and unloading portions of the stress-strain loop are significantly temperature dependent. Shape memory effect below the austenite finish transition temperature, Af, and superelastic behavior above Af are also observed at the high strain rate.

Keywords
shape memory alloy, high strain rate behavior, dynamic hysteresis, SHPB, Nitinol
Milestones
Received: 28 October 2005
Revised: 17 December 2005
Accepted: 20 December 2005
Published: 1 June 2006
Authors
Weinong Chen
Schools of Aeronautics and Astronautics and Materials Engineering
Purdue University
West Lafayette, IN 47907-2023
United States
Bo Song
School of Aeronautics and Astronautics
Purdue University
West Lafayette, IN 47907-2023
United States