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

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

doi:10.1117/12.839871

20 October 2009 Scaling analysis for hardness of shape memory alloys in sharp conical indentation

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

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74930K (2009) https://doi.org/10.1117/12.839871
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

Abstract

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.

Citation Download Citation

G. Z. Kang, Q. H. Kan, and W. Yan "Scaling analysis for hardness of shape memory alloys in sharp conical indentation", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74930K (20 October 2009); https://doi.org/10.1117/12.839871

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