Constrained Recovery Stress Output Characteristics and Construction of Constitutive Model of NiTi Shape Memory Alloy Wire
LIU Bo1, WANG Sheliang1, HE Lu1, LI Hao1, YANG Tao2, LI Binbin1,3
1 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2 School of Urban Planning and Municipal Engineering, Xi'an Polytechnic University, Xi'an 710048, China 3 Key Laboratory of Structural Engineering and Earthquake Resistance, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract: In order to promote the application of the shape memory alloy (SMA) as an intelligent driving material in the field of engineering structure, the effect of pre-strain and thermal cycle times on the constrained recovery stress-temperature curve, maximum constrained recovery stress, inverse phase transition characteristic temperature, phase transition temperature range and phase transition hysteresis temperature range of Ti-50.8wt% Ni SMA wires were studied. Based on the experimental data set, the hysteresis model of BP neural network (neural network algorithm trained according to error reverse propagation) with temperature and complete thermal cycle times as input and constrained recovery stress as output was established. The results show that the maximum constrained recovery stress and the characteristic temperature of martensite reverse transformation increase with the increase of pre-strain. In the first thermal cycle, NiTi SMA wire with 6% pre-strain exhibits the highest constrained recovery stress and the highest characteristic temperature of reverse variation. After five times of thermal cycle, the recovery stress-temperature curve of NiTi SMA wire gradually reached stability. The numerical results of neural network hysteresis model are in good agreement with the experimental data, and the mean absolute error of the calculated results is less than 5%.The hysteresis model of BP network is simple, pratical and accurate, and has certain engineering guiding significance.
刘博, 王社良, 何露, 李昊, 杨涛, 李彬彬. NiTi形状记忆合金丝的约束回复应力输出特性及本构模型[J]. 材料导报, 2020, 34(10): 10082-10087.
LIU Bo, WANG Sheliang, HE Lu, LI Hao, YANG Tao, LI Binbin. Constrained Recovery Stress Output Characteristics and Construction of Constitutive Model of NiTi Shape Memory Alloy Wire. Materials Reports, 2020, 34(10): 10082-10087.
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