Mean strain effects and microstructural observation during in-vitro fatigue testing of NiTi


Morgan, N.B., Painter, J. and Moffat, A.J. (2003) Mean strain effects and microstructural observation during in-vitro fatigue testing of NiTi. In, Proceedings of the International Conference on Shape Memory and Superelastic Technologies (SMST-2003). SMST-2003: International Conference on Shape Memory and Superelastic Technologies Monterey, USA, Monterey Institute of Advanced Studies, 303-310.

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Description/Abstract

The non-linear nature of the superelastic phase transformation in NiTi means that conventional fatigue life theory is difficult to apply. The volume fraction of martensite/parent phase and its role in the fatigue mechanism is not understood. This paper considers the fatigue life of superelastic NiTi alloys when tested at 2Hz in Ringers solution. In agreement with other researchers [1] [2] it was found that low alternating strains but high mean strain values resulted in the longest fatigue lives. To support the mechanical testing data, optical and electron microscopy was used to investigate the mechanism of fatigue and the role of the NiTi microstructure.

Item Type: Book Section
ISBNs: 0966050835 (hardback)
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 49958
Date Deposited: 07 Jan 2008
Last Modified: 27 Mar 2014 18:33
Publisher: Monterey Institute of Advanced Studies
URI: http://eprints.soton.ac.uk/id/eprint/49958

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