Mechanical Model for Super-elastic Helical Spring of Shape Memory Alloy

doi:10.3901/JME.2019.08.056

Abstract

Abstract: The distributions of strain and stress in the section of the shape memory alloy (SMA) wire of helical spring are analyzed and described based on the deformation theory of ordinary helical spring and constitutive model of SMA. Then the formulas are derived to calculate the phase transition critical parameters of SMA helical spring. A mechanical model, which expresses the relation of axial force and axial deformation in SMA helical spring, is developed based on the experimental phenomena and the formulas of phase transition critical parameters of SMA helical spring. Results show that the developed mechanical model is able to predict the relation of axial force and axial deformation in SMA helical spring and overcome the limitations of geometric modeling and numerical convergence in the finite element method. Therefor it can serve as the theoretical basis and technical reference for the investigation on the mechanical behaviors of SMA helical spring and the structure design based on SMA helical spring.

Key words: helical spring, mechanical model, phase transition critical parameter, shape memory alloy

CLC Number:

TG139

ZHOU Bo, WANG Zhiyong, XUE Shifeng. Mechanical Model for Super-elastic Helical Spring of Shape Memory Alloy[J]. Journal of Mechanical Engineering, 2019, 55(8): 56-64.

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