Abstract
Compared with other loading types, compression is preferred for applications of superelastic NiTi due to the significantly longer fatigue life. However, compressive loading induces concerns on potential structural instability. In this paper, a phenomenological constitutive model is proposed for superelastic NiTi and integrated into the finite-element model to account for the buckling behavior of superelastic NiTi tubes. The shell-type buckling, column-type buckling and buckling–unbuckling phenomenon are reproduced and verified with experiments by varying the geometric parameters of NiTi tubes (i.e., diameter-to-thickness ratio and aspect ratio). The reduction in material stiffness associated with the onset and progression of martensitic transformation facilitates column-type buckling. In certain low-aspect-ratio (stout) tubes, unbuckling enables the buckled tube to resume straight configuration under monotonic contraction, which is confirmed to be a consequence of the unique stiff-soft-stiff material law. Shell-type buckling occurs in thin-walled tubes, and it transits to column-type buckling as the tube length increases. A simple theoretical analysis is performed to establish the condition of each buckling type and reasonably good agreement with finite element simulations is reached. The present study will pave the way for the design of anti-buckling shape memory alloy components.
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Acknowledgements
Yao Xiao is grateful to the support from the Fundamental Research Funds for the Central Universities. Dongjie Jiang is sponsored by the National Natural Science Foundation of China (Grant No. 11902195).
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Xiao, Y., Jiang, D. Buckling and Unbuckling of Superelastic NiTi Tube. Acta Mech. Solida Sin. 35, 647–660 (2022). https://doi.org/10.1007/s10338-021-00303-2
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DOI: https://doi.org/10.1007/s10338-021-00303-2