DOI of the published article https://doi.org/10.1016/j.ijsolstr.2023.112436
Predicting transformation patterns in pseudoelastic NiTi tubes under proportional axial-torsion loading
Keywords:Shape memory alloys, Phase transformation, Strain localization, Propagating instabilities, Finite-element method
We present a comprehensive modeling study on the patterns of propagating instabilities in NiTi tubes under proportional axial-torsion loading. Our study directly refers to the experimental work of Reedlunn et al. (Int. J. Solids Struct., 199, 1-35, 2020), with a particular focus on the unique longitudinal transformation bands that occur in torsion-dominated loading paths. A previously-developed gradient-enhanced model of pseudoelasticity is employed and is adapted to incorporate the residual stresses. In addition, our finite-element setup accounts for the impact of collet grips on the NiTi tubes via a simplified frictional contact model. The results demonstrate the capability of the model in capturing subtle features of the transformation patterns observed in the experiment, including the multi-finger fronts in tension-dominated loading and longitudinal bands in torsiondominated loading. Our study suggests that the combination of the residual stresses and the collet grips facilitates the formation of longitudinal bands.
Copyright (c) 2023 Mohsen Rezaee Hajidehi, Stanislaw Stupkiewicz
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