Abstract

Info

Title:: Hysteretic Performance of Large Scale Superelastic NiTi Shape Memory Alloy Helical Spring

Author(s):: ZHUANG Peng; NIE Pan; XUE Su-duo; HAN Miao; School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture

Keywords:: shape memory alloy; helical spring; superelasticity; mechanical experiment; hysteretic performance

Abstract:: The large scale superelastic helical springs were fabricated with two types of NiTi shape memory alloy (SMA), and hysteretic performance test of superelastic SMA helical springs was carried out under uniaxial cyclic loading.The restoring force behavior and energy dissipation capacity of SMA helical springs were studied, and the influences of loading frequency, displacement amplitude on the hysteretic curves and the mechanical behavior parameters, such as equivalent stiffness, energy dissipation per cycle, equivalent damping ratio and residual displacement, were analyzed.Combining the rigid-elastic model and the Bouc-Wen model, a simplified restoring force model of SMA helical spring was established, which was available to integral structure, and the numerical simulation was performed with the model. The results show that SMA helical springs exhibit stable hysteresis curves, excellent re-centering performance and large [JP2]deformation capacity. The remarkable properties make the SMA spring an ideal subcomponent for [JP]use in re-centering devices. The numerical results match closely with the experimental data, proving the validity of the proposed restoring force model of the SMA helical springs.