A Strain Rate Effect of Ni–Ti Shape Memory Alloy Wire

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概要

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• This paper presents a strain-rate thermo-mechanical description of stress-induced martensite phase transformation and the associated shape memory effect on shape memory alloys (SMAs). The main difficulty in describing the thermo-mechanical behavior of SMA lies in the modeling of the transformation stresses. Since there is a conflict between the strain hardening associated with the stress and the re-orientational hardening due to temperature variation according to the strain-rates of SMA, modeling the stress of SMA is not trivial. In this paper, a linear evolution of the temperature with deformation rate is experimentally and theoretically validated for low and medium strain rates. The transition stress increases during forward transformation and decreases during reverse transformation at a certain environmental temperature in the pseudo-elastic range. This variation of the transition stress is attributed to the temperature rise and fall related to the strain rate during the phase transformation.

• 2010-11-25

著者

• Cho Maenghyo

  School of Mechanical and Aerospace Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea

• Cho Maenghyo

  School of Mechanical and Aerospace Engineering, Seoul National University, San 56-1, Shilim-dong, Kwanak-ku, Seoul 151-744, Korea

• Kim Sanghaun

  School of Mechanical and Aerospace Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea

関連論文

• A Strain Rate Effect of Ni–Ti Shape Memory Alloy Wire
• Continuum-Based Bridging Model of Nanoscale Thin Film Considering Surface Effects

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