Local and equivalent stress intensity factors for tortuous cracks under remote mode II loading

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F19%3A00511004" target="_blank" >RIV/68081723:_____/19:00511004 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26210/19:PU133027

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0167844218306372?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167844218306372?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.tafmec.2019.01.030" target="_blank" >10.1016/j.tafmec.2019.01.030</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Local and equivalent stress intensity factors for tortuous cracks under remote mode II loading

Popis výsledku v původním jazyce

In metallic materials the paths and fronts of fatigue cracks usually exhibit a certain tortuosity caused by microstructural heterogeneities. Our previous calculations for remote mode III loading revealed that the in-plane tortuosity of pre-crack fronts was associated with significant local k2 components of the effective stress intensity factor (SIF), thus enabling small segments growing in the local mode II to gradually advance the whole “mode III” crack front. In this work, the local effective SIFs at both in-plane and out-of-plane (3D) serrated crack fronts in the compact-tension-shear specimen under the remote mode II loading are numerically investigated by neglecting the friction stresses. The changes in local and global effective SIFs are presented separately for in-plane and out-of-plane tortuous crack fronts and, on the global level, also for their combination. Local k3 components appeared at in-plane serrated crack fronts and, for the out-of-plane roughness, local k1-values were present. For equal levels of the remote mode II loading, a geometrical shielding effect induced by the crack tortuosity, i.e., a uniform decrease of an averaged k2-value with increasing roughness of the crack front was revealed. When all three local loading modes along the tortuous crack front were considered in terms of equivalent SIFs, the shielding effect was also revealed in an entire or a prevailing range of roughness characteristics. However, some of equivalent SIF definitions predicted an unexpected slight anti-shielding effect in a certain small range of roughness characteristics close to those associated with crack fronts in real metallic materials.

Název v anglickém jazyce

Local and equivalent stress intensity factors for tortuous cracks under remote mode II loading

Popis výsledku anglicky

In metallic materials the paths and fronts of fatigue cracks usually exhibit a certain tortuosity caused by microstructural heterogeneities. Our previous calculations for remote mode III loading revealed that the in-plane tortuosity of pre-crack fronts was associated with significant local k2 components of the effective stress intensity factor (SIF), thus enabling small segments growing in the local mode II to gradually advance the whole “mode III” crack front. In this work, the local effective SIFs at both in-plane and out-of-plane (3D) serrated crack fronts in the compact-tension-shear specimen under the remote mode II loading are numerically investigated by neglecting the friction stresses. The changes in local and global effective SIFs are presented separately for in-plane and out-of-plane tortuous crack fronts and, on the global level, also for their combination. Local k3 components appeared at in-plane serrated crack fronts and, for the out-of-plane roughness, local k1-values were present. For equal levels of the remote mode II loading, a geometrical shielding effect induced by the crack tortuosity, i.e., a uniform decrease of an averaged k2-value with increasing roughness of the crack front was revealed. When all three local loading modes along the tortuous crack front were considered in terms of equivalent SIFs, the shielding effect was also revealed in an entire or a prevailing range of roughness characteristics. However, some of equivalent SIF definitions predicted an unexpected slight anti-shielding effect in a certain small range of roughness characteristics close to those associated with crack fronts in real metallic materials.

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

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Theoretical and Applied Fracture Mechanics

ISSN

0167-8442

e-ISSN

—

Svazek periodika

101

Číslo periodika v rámci svazku

JUN

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

35-45

Kód UT WoS článku

000466257700004

EID výsledku v databázi Scopus

2-s2.0-85061527232