Description of Fatigue Crack Growth under Modes II, III and II+III in Terms of J-integral

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F14%3APU111170" target="_blank" >RIV/00216305:26620/14:PU111170 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.mspro.2014.06.136" target="_blank" >http://dx.doi.org/10.1016/j.mspro.2014.06.136</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mspro.2014.06.136" target="_blank" >10.1016/j.mspro.2014.06.136</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Description of Fatigue Crack Growth under Modes II, III and II+III in Terms of J-integral

Popis výsledku v původním jazyce

Mode II and mode III fatigue crack growth rates and the related intrinsic stress intensity factor range thresholds deltaKIIeff,th and deltaKIIIeff,th were for a long time expected to be equal. However, there are many theoretical and experimental indications of a slower crack growth rate and a higher threshold for mode III than that for mode II for various metallic materials. In this article, a description of shear-mode fatigue crack growth for specimens made of ARMCO iron in terms of a diagram da/dN vs. deltaJ is presented and compared with that based on deltaK. For higher applied loads the description in terms of deltaK is no more valid which turned out from a precise assessment of plastic zone size for a wide range of shear-mode loading levels in these specimens. This numerical elasto-plastic analysis revealed that the small-scale yielding conditions were only fulfilled in the near-threshold region and, for higher loading levels, the deltaJ approach should be utilized. The measured curves plotted for loading modes II, III and II+III showed higher effective mode II threshold than that of mode III but approximately equal crack growth rates for both modes II and III. The mode II cracks in metals usually propagate faster than the mode III ones because the factory-roof morphology created under mode III loading produces a high friction, thus reducing the effective crack driving force significantly. The unusual behavior of ARMCO iron can be explained here by a coplanar crack propagation without forming the factory roof morphology.

Název v anglickém jazyce

Description of Fatigue Crack Growth under Modes II, III and II+III in Terms of J-integral

Popis výsledku anglicky

Mode II and mode III fatigue crack growth rates and the related intrinsic stress intensity factor range thresholds deltaKIIeff,th and deltaKIIIeff,th were for a long time expected to be equal. However, there are many theoretical and experimental indications of a slower crack growth rate and a higher threshold for mode III than that for mode II for various metallic materials. In this article, a description of shear-mode fatigue crack growth for specimens made of ARMCO iron in terms of a diagram da/dN vs. deltaJ is presented and compared with that based on deltaK. For higher applied loads the description in terms of deltaK is no more valid which turned out from a precise assessment of plastic zone size for a wide range of shear-mode loading levels in these specimens. This numerical elasto-plastic analysis revealed that the small-scale yielding conditions were only fulfilled in the near-threshold region and, for higher loading levels, the deltaJ approach should be utilized. The measured curves plotted for loading modes II, III and II+III showed higher effective mode II threshold than that of mode III but approximately equal crack growth rates for both modes II and III. The mode II cracks in metals usually propagate faster than the mode III ones because the factory-roof morphology created under mode III loading produces a high friction, thus reducing the effective crack driving force significantly. The unusual behavior of ARMCO iron can be explained here by a coplanar crack propagation without forming the factory roof morphology.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20306 - Audio engineering, reliability analysis

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

2014

Kód důvěrnosti údajů

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

Název periodika

Procedia Materials Science

ISSN

2211-8128

e-ISSN

—

Svazek periodika

3

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

835-840

Kód UT WoS článku

000398274600131

EID výsledku v databázi Scopus

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