Temperature dependence of a NiTi shape memory alloy's superelastic behavior at a high strain rate

Chen, Weinong; Bo, Song

doi:10.2140/jomms.2006.1.339

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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

DOI: 10.2140/jomms.2006.1.339

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 $4.35 \times 1 0^{2}$ s $^{- 1}$ 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 $^{\circ}$ 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, $A_{f}$ , and superelastic behavior above $A_{f}$ 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

Vol. 1, No. 2, 2006

Weinong Chen and Bo Song

Abstract

Keywords

Milestones

Authors