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Proceedings Paper

Measurement of localized deformation of shape memory alloy under fast tensile loading
Author(s): Ping Feng; Qing-Ping Sun; Tong-Xi Yu
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Paper Abstract

The deformation of NiTi shape memory alloy strips and microtubes subjected to uniaxial tensile loading involves formation and growth of high-strain martensite domain(s) of various shapes due to autocatalytic stress-induced phase transformation. Under fast tensile loading with strain rates of 10-3~100/s, the number of the domains will increase with the strain rate and the domain morphology becomes very complicated. Measurement of this kind of highly inhomogeneous and localized deformation is a challenging problem. This paper reports the results of our recent experimental advances in solving such problem. It includes: (1) the determination of domain front by direct characterization method, block tracking method, and speckle tracking method; (2) non-contact measurement of global and local strains by flexible video extensometer method. The above methods used in the measurements have been proved to be reliable and suitable for the localized deformation under fast tensile loading conditions.

Paper Details

Date Published: 25 August 2009
PDF: 7 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73756Q (25 August 2009); doi: 10.1117/12.839389
Show Author Affiliations
Ping Feng, Shenzhen Univ. (China)
The Hong Kong Univ. of Science and Technology (Hong Kong, China)
Qing-Ping Sun, The Hong Kong Univ. of Science and Technology (Hong Kong, China)
Tong-Xi Yu, The Hong Kong Univ. of Science and Technology (Hong Kong, China)


Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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