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Hysteretic parameters model of super-elastic shape memory alloy

SUN Hongxin;BIN Shuai;WANG Xiuyong;School of Civil Engineering,Hunan University of Science and Technology;  
Based on mechanical tests of superelastic shape memory alloy wire,the main influence factors and changing rules of the SMA hysteretic characteristics were demonstrated.A SMA hysteresis parameters model of super-elastic SMA was established.By analyzing the test data results,strain amplitude and loading rate are the two main factors influencing the SMA hysteresis behavior.By introducing the sinh function and using particle swarm optimization(PSO) algorithm,this paper proposes a SMA hysteresis parameters model considering the influences of the two-factor.Identifying the parameters and determine the relationship based on the test data,and then comparing the model calculation value and the experimental value of different working conditions.Finally,it is concluded that the developed hysteresis parameters model can well simulate the stress-strain relationship of SMA and reflect its hysteresis mechanical properties.
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