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SHAYANFARD, P. HELLER, L. ŠANDERA, P. ŠITTNER, P.
Originální název
Thermomechanically Transforming Notched NiTi Thin Ribbon: Effect of Martensitic Transformation on Stress Gradients
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
angličtina
Originální abstrakt
In this work, we used numerical simulations to investigate the effect of thermally induced forward martensitic transformation(MT) under constant load on thestress redistribution around stress risers. Finite element simulations of stress redistribution around two-sided notches in a thin NiTi ribbon subjected to constant tensile force and homogeneous cooling from austenite to martensite were performed. Changesin stress gradients around the notches were analyzed with regard to heterogeneity of thermomechanically driven MT. A parametric study was performed in order to understand the effect of transformation strains, Young’s modulus of martensite and notch radiuson the magnitude of notch-tip stresses after the completion of MT. We found that forward MT critically amplifies the initial elastic stress gradients around the notch. The increase in magnitude of notch-tip stress is closely related to elastic deformation in martensite needed to accommodate the transformation strain in the surrounding notch unaffected zone. This approximation holds for notch radii being small compared to the ribbon width. For large radiiMT is more homogeneous, the notch-tip is more shielded from transforming surroundings and, hence, the notch-tip stress approach the nominal stress.
Klíčová slova
Shape Memory Alloy, Thermo-mechanical Loading, Notch-tip, Stress Redistribution, Constant Bias Stress, Martensitic Transformation
Autoři
SHAYANFARD, P.; HELLER, L.; ŠANDERA, P.; ŠITTNER, P.
Vydáno
20. 12. 2019
Nakladatel
Elsevier
ISSN
2452-3216
Periodikum
Procedia Structural Integrity
Stát
Italská republika
Strany od
620
Strany do
625
Strany počet
6
URL
https://www.sciencedirect.com/science/article/pii/S2452321620302225
BibTex
@inproceedings{BUT161691, author="Pejman {Shayanfard} and Luděk {Heller} and Pavel {Šandera} and Petr {Šittner}", title="Thermomechanically Transforming Notched NiTi Thin Ribbon: Effect of Martensitic Transformation on Stress Gradients", booktitle="Procedia Structural Integrity", year="2019", journal="Procedia Structural Integrity", pages="620--625", publisher="Elsevier", doi="10.1016/j.prostr.2020.01.155", issn="2452-3216", url="https://www.sciencedirect.com/science/article/pii/S2452321620302225" }