A finite-strain model for a superelastic NiTi shape memory alloy
Dongjie Jiang1
, Yao Xiao2,3
1School of Aeronautics and Astronautics, Shanghai Jiao Tong University, 200240 Shanghai, China.
2School of Mechanical Engineering, Tongji University, 201804 Shanghai, China.
3Institute for Advanced Study, Tongji University, 200092 Shanghai, China.
DOI:
https://doi.org/10.7494/cmms.2022.1.0770
Abstract:
A finite-strain constitutive model of a superelastic NiTi shape memory alloy is proposed in this paper. Via backward Euler implicit integration scheme and the incorporation of material softening, the model is implemented into finite element code to reproduce a Lüders like deformation of a superelastic NiTi. The simulation results are in agreement with the experimental results, indicating that the constitutive model can reasonably predict the mechanical behavior of a superelastic NiTi. A parametric study further verifies that the magnitude of softening modulus has a significant effect on the stress-strain response and Lüders-like deformation of a superelastic NiTi.
Cite as:
Jiang, D., & Xiao, Y., (2022). A finite-strain model for a superelastic NiTi shape memory alloy. Computer Methods in Materials Science, 22 (1), pages 23-30. https://doi.org/10.7494/cmms.2022.1.0770
Article (PDF):
Keywords:
Shape memory alloy, Martensitic transformation, Finite-strain constitutive model, Lüders-like deformation
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