Detail publikace

Thermomechanically Transforming Notched NiTi Thin Ribbon: Effect of Martensitic Transformation on Stress Gradients

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"
}