Investigation on Deformation Mechanisms of NiTi Shape Memory Alloy Tube under Radial Loading
AbstractNiTi shape memory alloy (SMA) tube was coupled with mild steel cylinder in order to investigate deformation mechanisms of NiTi SMA tubes undergoing radial loading. NiTi SMA tubes of interest deal with two kinds of nominal compositions; namely, Ni-50 at % Ti and Ni-49.1 at % Ti, where at room temperature, B19′ martensite is dominant in the former, and B2 austensite is complete in the latter. The mechanics of the NiTi SMA tube during radial loading were analyzed based on elastic mechanics and plastic yield theory, where effective stress and effective strain are determined as two important variables that investigate deformation mechanisms of the NiTi SMA tube during radial loading. As for the NiTi SMA tube with austenite structure, stress-induced martensite (SIM) transformation as well as plastic deformation of SIM occur with the continuous increase of effective stress. As for NiTi SMA tube which possesses martensite structure, reorientation and detwinning of twinned martensite as well as plastic deformation of reoriented and detwinned martensite occur with the continuous increase in the effective stress. Plastic deformation for dislocation slip has a negative impact on superelasticity and shape memory effect of NiTi SMA tube. View Full-Text
Share & Cite This Article
Jiang, S.; Yu, J.; Hu, L.; Zhang, Y. Investigation on Deformation Mechanisms of NiTi Shape Memory Alloy Tube under Radial Loading. Metals 2017, 7, 268.
Jiang S, Yu J, Hu L, Zhang Y. Investigation on Deformation Mechanisms of NiTi Shape Memory Alloy Tube under Radial Loading. Metals. 2017; 7(7):268.Chicago/Turabian Style
Jiang, Shuyong; Yu, Junbo; Hu, Li; Zhang, Yanqiu. 2017. "Investigation on Deformation Mechanisms of NiTi Shape Memory Alloy Tube under Radial Loading." Metals 7, no. 7: 268.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.