Mechanics examination on the wear behaviour of shape memory alloys

Yan, Wenyi (2005) Mechanics examination on the wear behaviour of shape memory alloys. In: 4th Australasian Congress on Applied Mechanics (ACAM 2005): Advances in Applied Mechanics, 16-18 Feb 2005, Melbourne, Australia.

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Shape memory alloys are well recognized functional and smart materials, which have been
exploited to develop intelligent structures and devices in many fields. Of particular importance is its exciting application in the field of biomechanical engineering. In addition, further potential applications of shape memory alloys are being investigated, such as shape memory alloys-based functional composites. Recent experimental research indicates that shape memory alloy nickeltitanium alloy (NiTi) is superior to stainless steel against wear and could be applied in tribological engineering. It is believed that the super wear resistance of shape memory alloys is mainly due to the recovery of the superelastic deformation. Our recent wear study indicates that wear rate is very
sensitive to the maximum contact pressure. In the present study, which involves applying Hertz contact theory and the finite element method, the wear behavior of shape memory alloys is investigated through analyzing the contact pressure. In contrast to the existing explanation of the major contribution of superelasticity, our investigation indicates that the superior wear resistance of shape memory alloys is directly linked to the low Young's modulus of the alloy, the low transformation stress and large transformation strain, which result in low maximum contact pressure and therefore low wear rate. Additionally, high plastic yield strength of transformed martensite NiTi also enhances its wear resistance.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author retains copyright.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 11 Oct 2007 00:19
Last Modified: 02 Jul 2013 22:31
Uncontrolled Keywords: shape memory alloys (SMA), wear, nickel-titanium alloy (NiTi)
Fields of Research : 09 Engineering > 0903 Biomedical Engineering > 090302 Biomechanical Engineering
09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
09 Engineering > 0910 Manufacturing Engineering > 091003 Machine Tools

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