Experimental investigation of the cyclic degradation of the one-way shape memory effect of NiTi alloys
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第12期
论文作者：Tian-xing Zhao Guo-zheng Kang Chao Yu Qian-hua Kan
文章页码：1539 - 1550
摘 要：Based on stress-and strain-controlled cyclic tension-unloading-heat-cooling tests, cyclic degradation of the one-way shape memory effect（OWSME） of NiTi shape memory alloys（SMAs） was investigated. It was seen, in thermo-mechanical coupled cyclic tests, that residual strain after each cycle accumulated, but the martensite reorientation stress and dissipation energy-per-cycle decreased as the number of cycles increased. Meanwhile, the cyclic degradation of OWSME was aggravated by increasing the stress/strain amplitude. In addition, the stress-strain response of NiTi SMAs was further investigated by performing simultaneous thermo-mechanical coupled cyclic tests with various phase-angle differences between the mechanical and thermal cyclic loadings. It can be concluded that such cyclic response depends significantly on prescribed phase-angle differences. Obtained experimental results are helpful for both the development of constitutive models and engineering applications of NiTi SMAs.
Tian-xing Zhao1,2，Guo-zheng Kang1,2，Chao Yu1,2，Qian-hua Kan1,2
1. Institute of Applied Mechanics, State Key Laboratory of Traction Power, Southwest Jiaotong University2. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University
摘 要：Based on stress-and strain-controlled cyclic tension-unloading-heat-cooling tests, cyclic degradation of the one-way shape memory effect（OWSME） of NiTi shape memory alloys（SMAs） was investigated. It was seen, in thermo-mechanical coupled cyclic tests, that residual strain after each cycle accumulated, but the martensite reorientation stress and dissipation energy-per-cycle decreased as the number of cycles increased. Meanwhile, the cyclic degradation of OWSME was aggravated by increasing the stress/strain amplitude. In addition, the stress-strain response of NiTi SMAs was further investigated by performing simultaneous thermo-mechanical coupled cyclic tests with various phase-angle differences between the mechanical and thermal cyclic loadings. It can be concluded that such cyclic response depends significantly on prescribed phase-angle differences. Obtained experimental results are helpful for both the development of constitutive models and engineering applications of NiTi SMAs.
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