Effect of strain rate on the macroscopic domain evolution in NiTi shape memory alloy strip under tension

Xinghua Zhang; Ping Feng; Tongxi Yu; Qingping Sun

doi:10.1117/12.839388

25 August 2009 Effect of strain rate on the macroscopic domain evolution in NiTi shape memory alloy strip under tension

Xinghua Zhang, Ping Feng, Tongxi Yu, Qingping Sun

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73756P (2009) https://doi.org/10.1117/12.839388
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

Stress-induced phase transformations in polycrystalline NiTi SMA strips under uniaxial tensile loading are often accompanied by unstable mechanical behavior with formation and growth of localized deformation bands. These macroscopic deformation domains grow via the motion of the transformation fronts, the velocity of which is related to the external loading rate. The latent heat of transformation leads to significant thermo-mechanical coupling in both the stress-strain response of the material and the domain pattern itself. This paper reports recent experimental measurement on the evolution of domain patterns under different strain rates (10^-4/s, 10^-3/s and 10^-2/s). The results revealed a significant thermo-mechanical coupling in the behavior of the material, which demonstrates a strong effect of the applied nominal strain rate on the domain morphology and stress-strain curve.

Citation Download Citation

Xinghua Zhang, Ping Feng, Tongxi Yu, and Qingping Sun "Effect of strain rate on the macroscopic domain evolution in NiTi shape memory alloy strip under tension", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73756P (25 August 2009); https://doi.org/10.1117/12.839388

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