Finite Element Method for Mechanical Behavior of Shape Memory Alloy Superelastic Cables

doi:10.3901/JME.2020.14.065

Abstract

Abstract: It is difficult to establish a theoretical model to describe the mechanical behavior of the shape memory alloy (SMA) superelastic cable because of the nonlinear material and contact problems. In order to overcome the disadvantages of high cost and susceptibility to environmental factors of experiment, an incremental SMA constitutive model suitable for finite element method is derived based on the concept of shape memory factor and SMA constitutive model. The ABAQUS user material subroutine is written to realize the finite element method for the mechanical behavior of the SMA superelastic cable with considering the change of elastic modulus during the transformation process by employing the secondary development function of ABAQUS software. The phase transition and mechanical behavior of the SMA superelastic cable is carried out numerically by using the established finite element method, and the numerical results are compared with the experimental results. Then the influence of the pitch of the outside strands on the mechanical behavior of the SMA superelastic cable is analyzed. The numerical result and its comparison with the experimental results show that the proposed finite element method can effectively describe and predict the phase transition and mechanical behavior of SMA superelastic cables during the tension process. The pitch of the outside strands has obvious influence on the phase transition and mechanical behavior of the SMA superelastic cable. The research work can provide calculation methods and technical guidance for the design and engineering application of SMA superelastic cables.

Key words: shape memory alloy, superelastic cable, finite element method, ABAQUS, user material subroutine

CLC Number:

TG139

KANG Zetian, WANG Zhiyong, ZHOU Bo, XUE Shifeng. Finite Element Method for Mechanical Behavior of Shape Memory Alloy Superelastic Cables[J]. Journal of Mechanical Engineering, 2020, 56(14): 65-72.

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