Finite element analysis on the effect of martensitic transformation and plastic deformation on the stress concentration factor in a thin notched superelastic NiTi ribbon

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F20%3APU136900" target="_blank" >RIV/00216305:26210/20:PU136900 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/20:00563609

Result on the web

<a href="https://www.worldscientific.com/doi/abs/10.1142/S1793604720510285" target="_blank" >https://www.worldscientific.com/doi/abs/10.1142/S1793604720510285</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1142/S1793604720510285" target="_blank" >10.1142/S1793604720510285</a>

Result language

angličtina

Original language name

Finite element analysis on the effect of martensitic transformation and plastic deformation on the stress concentration factor in a thin notched superelastic NiTi ribbon

Original language description

The severe nonlinear behavior caused by the martensitic transformation (MT) and subsequent plastic deformation (PD) of det-winned martensite leads to a complex local stress redistribution at the location of stress risers of superelastic shape memory alloy (SMA) components. Nevertheless, in the literature, the simple linear elastic fracture mechanics (LEFM) equations are widely used in the evaluation of the fracture response of superelastic components which has resulted in obvious conflicts between the conclusions regarding the effect of MT on the fracture parameters, i.e. stress intensity factor (SIF) and material toughness. Furthermore, the linear elasticity method is frequently used in the literature to calculate the stress intensity range (Delta K) when the fatigue crack growth rate dependence on Delta K (da/dN - Delta K) is being evaluated. Moreover, the PD followed by MT is poorly considered in the fracture mechanics of SMAs. This paper presents a numerical investigation on the role of both MT and PD, as well as the notch acuity, on the evolution of notch-tip stresses and strains and stress concentration factor (K-tn) upon the incremental application of the macroscopic tensile load on a thin NiTi notched superelastic ribbon, to mimic the effects of MT and PD on the SIF of superelastic parts. It is revealed that MT results in drastic deviations of the notch-tip stress, as well as the stress concentration factor (K-tn), from that obtained in LEFM. Due to the heterogeneous evolution of MT, the trend of the deviations is not regular and unique upon monotonic external loading. Accordingly, the results represent the ineffectiveness of the LEFM method in the evolution of the stress concentration factor (hence, the SIF) and toughness in monotonic loading, as well as the stress intensity range (Delta K) under fatigue loading in SMA components.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2020

Confidentiality

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

Name of the periodical

FUNCT MATER LETT

ISSN

1793-6047

e-ISSN

1793-7213

Volume of the periodical

13

Issue of the periodical within the volume

5

Country of publishing house

SG - SINGAPORE

Number of pages

8

Pages from-to

2051028-2051028

UT code for WoS article

000562046800014

EID of the result in the Scopus database

2-s2.0-85087572908