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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F19%3APU135100" target="_blank" >RIV/00216305:26210/19:PU135100 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2452321620302225" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2452321620302225</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.prostr.2020.01.155" target="_blank" >10.1016/j.prostr.2020.01.155</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Procedia Structural Integrity

ISBN

978-80-214-5760-7

ISSN

2452-3216

e-ISSN

—

Počet stran výsledku

6

Strana od-do

620-625

Název nakladatele

Elsevier

Místo vydání

neuveden

Místo konání akce

Brno

Datum konání akce

26. 6. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—