Stress raisers and fracture in shape memory alloys: review and ongoing challenges

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F21%3APU140666" target="_blank" >RIV/00216305:26210/21:PU140666 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/22:00567867

Výsledek na webu

<a href="https://doi.org/10.1080/10408436.2021.1896475" target="_blank" >https://doi.org/10.1080/10408436.2021.1896475</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/10408436.2021.1896475" target="_blank" >10.1080/10408436.2021.1896475</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stress raisers and fracture in shape memory alloys: review and ongoing challenges

Popis výsledku v původním jazyce

Shape memory alloys (SMAs) are able to recover large inelastic strains due to their thermal-/stress-induced phase transformation between austenite and martensite. Stress raisers can either initially exist in SMA components as the manufacturing-induced micro-defects, or may nucleate upon monotonic/cyclic loading, for instance, due to decohesion of the second particles or local cyclic plastic deformations. Furthermore, from a physical point of view, there is a problem why SMAs can withstand tens of millions of cycles if they deform elastically but only thousands of cycles if the martensitic transformation is involved in their cyclic deformation under the stress, even if the martensitic transformation is reversible. One of the possibilities is the nucleation and propagation of cracks from the stress raisers since the evolution of the transformation and local mechanical gradients are completely different at the high-stress zones at stress raisers than that being experienced within the elastic bulk. Thus, the successful implementation of SMA elements into engineering applications requires understanding and analysis of the role of the stress raisers in fracture and fatigue crack growth properties of shape memory alloys. The linear and non-linear Fracture Mechanics theories, commonly used to describe the fracture processes in typical structural alloys, need to be enhanced to capture the complex deformation mechanisms characterizing SMAs. In the present paper, first, the latest progress made in experimental, numerical, and theoretical analyses on the role of the stress raisers in the fracture parameters of SMAs are reviewed and discussed under both pure mechanical and thermomechanical loading conditions. Then, the state-of-arts in fatigue crack growth are addressed. In the end, summary and future topics are outlined.

Název v anglickém jazyce

Stress raisers and fracture in shape memory alloys: review and ongoing challenges

Popis výsledku anglicky

Shape memory alloys (SMAs) are able to recover large inelastic strains due to their thermal-/stress-induced phase transformation between austenite and martensite. Stress raisers can either initially exist in SMA components as the manufacturing-induced micro-defects, or may nucleate upon monotonic/cyclic loading, for instance, due to decohesion of the second particles or local cyclic plastic deformations. Furthermore, from a physical point of view, there is a problem why SMAs can withstand tens of millions of cycles if they deform elastically but only thousands of cycles if the martensitic transformation is involved in their cyclic deformation under the stress, even if the martensitic transformation is reversible. One of the possibilities is the nucleation and propagation of cracks from the stress raisers since the evolution of the transformation and local mechanical gradients are completely different at the high-stress zones at stress raisers than that being experienced within the elastic bulk. Thus, the successful implementation of SMA elements into engineering applications requires understanding and analysis of the role of the stress raisers in fracture and fatigue crack growth properties of shape memory alloys. The linear and non-linear Fracture Mechanics theories, commonly used to describe the fracture processes in typical structural alloys, need to be enhanced to capture the complex deformation mechanisms characterizing SMAs. In the present paper, first, the latest progress made in experimental, numerical, and theoretical analyses on the role of the stress raisers in the fracture parameters of SMAs are reviewed and discussed under both pure mechanical and thermomechanical loading conditions. Then, the state-of-arts in fatigue crack growth are addressed. In the end, summary and future topics are outlined.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES

ISSN

1040-8436

e-ISSN

1547-6561

Svazek periodika

neuveden

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

59

Strana od-do

1896475-1896475

Kód UT WoS článku

000648478300001

EID výsledku v databázi Scopus

2-s2.0-85105864073