Prof. Guozheng Kang Profile

Prof. Guozheng Kang

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Proceedings Article | 21 October 2009 Paper

Scaling analysis for hardness of shape memory alloys in sharp conical indentation

G. Z. Kang, Q. H. Kan, W. Yan

Proceedings Volume 7493, 74930K (2009) https://doi.org/10.1117/12.839871

KEYWORDS: Shape memory alloys, Phase measurement, Amplifiers, Metals, Finite element methods, Temperature metrology, Aerospace engineering, Solids, Spherical lenses, Numerical simulations

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Based on the dimensional analysis approach and finite element calculations, several scaling relationships in the indentation of super-elastic shape memory alloys with sharp conical indenter were obtained. These scaling relationships illustrate the dependence of the indentation response and the hardness on the material properties of shape memory alloys, such as the phase transformation and plastic deformation. In the finite element calculation, a newly developed constitutive model of super-elastic shape memory alloy including the plasticity of induced martensite phase was employed. It is shown that the yield stress and strain-hardening parameter of induced-martensite plays an important role in the indentation response besides the phase transition properties. Additionally, the general relationships between the indentation hardness and the phase transformation stress, maximum transformation strain, martensite yield stress, and strain-hardening parameter of shape memory alloys were obtained. The results show that the indentation hardness of shape memory alloys is not proportional to the phase transformation stress and martensite yield stress, and cannot be used directly to measure the phase transformation stress and yield stress of super-elastic shape memory alloys.

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