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Effect of mechanical cycling on the stress-strain response of a martensitic Nitinol shape memory alloy

Nayan, Niraj and Buravalla, V and Ramamurty, U (2009) Effect of mechanical cycling on the stress-strain response of a martensitic Nitinol shape memory alloy. In: Materials Science and Engineering A, 525 (1-2). pp. 60-67.

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An experimental investigation into the ambient temperature, load-controlled tension�tension fatigue behavior of a martensitic Nitinol shape memory alloy (SMA) was conducted. Fatigue life for several stress levels spanning the critical stress for detwinning was determined and compared with that obtained on an alloy similar in composition but in the austenitic state at room temperature. Results show that the fatigue life of the pseudo-plastic alloy is superior to superelastic shape memory alloy. The stress�strain hysteretic response, monitored throughout the fatigue loading, reveals progressive strain accumulation with the cyclic loading. In addition, the area of hysteresis and recoverable and frictional energies were found to decrease with increasing number of fatigue cycles. Post-mortem characterization of the fatigued specimens through calorimetry and fractography was conducted in order to get further insight into the fatigue micromechanisms. These results are discussed in terms of reversible and irreversible microstructural changes that take place during cyclic loading. Aspects associated with self-heating of martensitic alloy undergoing high frequency stress cycling are discussed.

Item Type: Journal Article
Publication: Materials Science and Engineering A
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Shape memory alloy;Martensite;Fatigue;Austenite;Strain accumulation.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 29 Oct 2009 08:29
Last Modified: 19 Sep 2010 05:51
URI: http://eprints.iisc.ac.in/id/eprint/24811

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