Modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions

High-temperature water stress corrosion cracking has high tensile stress sensitivity, and its growth rate has been evaluated using the stress intensity factor, which is a linear fracture mechanics parameter. Stress corrosion cracking mainly occurs and propagates around welded metals or heat-affected...

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Autores principales:	Tetsuo YASUOKA, Yoshihiro MIZUTANI, Akira TODOROKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	stress intensity factor j-integral crack growth evaluation stress distribution yield strength distribution large-scale yielding stress corrosion cracking Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/8c78546821f1439f99e868b2c71b0e58
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spelling	oai:doaj.org-article:8c78546821f1439f99e868b2c71b0e582021-11-26T06:05:34ZModified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions2187-974510.1299/mej.2014smm0009https://doaj.org/article/8c78546821f1439f99e868b2c71b0e582014-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/3/1_2014smm0009/_pdf/-char/enhttps://doaj.org/toc/2187-9745High-temperature water stress corrosion cracking has high tensile stress sensitivity, and its growth rate has been evaluated using the stress intensity factor, which is a linear fracture mechanics parameter. Stress corrosion cracking mainly occurs and propagates around welded metals or heat-affected zones. These regions have complex residual stress distributions and yield strength distributions because of input heat effects. The authors previously reported that the stress intensity factor becomes inapplicable when steep residual stress distributions or yield strength distributions occur along the crack propagation path, because small-scale yielding conditions deviate around those distributions. Here, when the stress intensity factor is modified by considering these distributions, the modified stress intensity factor may be used for crack growth evaluation for large-scale yielding. The authors previously proposed a modified stress intensity factor incorporating the stress distribution or yield strength distribution in front of the crack using the rate of change of stress intensity factor and yield strength. However, the applicable range of modified stress intensity factor for large-scale yielding was not clarified. In this study, the range was analytically investigated by comparison with the J-integral solution. A three-point bending specimen with parallel surface crack was adopted as the analytical model and the stress intensity factor, modified stress intensity factor and equivalent stress intensity factor derived from the J-integral were calculated and compared under large-scale yielding conditions. The modified stress intensity was closer to the equivalent stress intensity factor when compared with the stress intensity factor. If deviation from the J-integral solution is acceptable up to 2%, the modified stress intensity factor is applicable up to 30% of the J-integral limit, while the stress intensity factor is applicable up to 10%. These results showed that the modified stress intensity factor can be applied even when the yielding scale exceeds the small-scale yielding criterion.Tetsuo YASUOKAYoshihiro MIZUTANIAkira TODOROKIThe Japan Society of Mechanical Engineersarticlestress intensity factorj-integralcrack growth evaluationstress distributionyield strength distributionlarge-scale yieldingstress corrosion crackingMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 3, Pp SMM0009-SMM0009 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	stress intensity factor j-integral crack growth evaluation stress distribution yield strength distribution large-scale yielding stress corrosion cracking Mechanical engineering and machinery TJ1-1570
spellingShingle	stress intensity factor j-integral crack growth evaluation stress distribution yield strength distribution large-scale yielding stress corrosion cracking Mechanical engineering and machinery TJ1-1570 Tetsuo YASUOKA Yoshihiro MIZUTANI Akira TODOROKI Modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions
description	High-temperature water stress corrosion cracking has high tensile stress sensitivity, and its growth rate has been evaluated using the stress intensity factor, which is a linear fracture mechanics parameter. Stress corrosion cracking mainly occurs and propagates around welded metals or heat-affected zones. These regions have complex residual stress distributions and yield strength distributions because of input heat effects. The authors previously reported that the stress intensity factor becomes inapplicable when steep residual stress distributions or yield strength distributions occur along the crack propagation path, because small-scale yielding conditions deviate around those distributions. Here, when the stress intensity factor is modified by considering these distributions, the modified stress intensity factor may be used for crack growth evaluation for large-scale yielding. The authors previously proposed a modified stress intensity factor incorporating the stress distribution or yield strength distribution in front of the crack using the rate of change of stress intensity factor and yield strength. However, the applicable range of modified stress intensity factor for large-scale yielding was not clarified. In this study, the range was analytically investigated by comparison with the J-integral solution. A three-point bending specimen with parallel surface crack was adopted as the analytical model and the stress intensity factor, modified stress intensity factor and equivalent stress intensity factor derived from the J-integral were calculated and compared under large-scale yielding conditions. The modified stress intensity was closer to the equivalent stress intensity factor when compared with the stress intensity factor. If deviation from the J-integral solution is acceptable up to 2%, the modified stress intensity factor is applicable up to 30% of the J-integral limit, while the stress intensity factor is applicable up to 10%. These results showed that the modified stress intensity factor can be applied even when the yielding scale exceeds the small-scale yielding criterion.
format	article
author	Tetsuo YASUOKA Yoshihiro MIZUTANI Akira TODOROKI
author_facet	Tetsuo YASUOKA Yoshihiro MIZUTANI Akira TODOROKI
author_sort	Tetsuo YASUOKA
title	Modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions
title_short	Modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions
title_full	Modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions
title_fullStr	Modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions
title_full_unstemmed	Modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions
title_sort	modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/8c78546821f1439f99e868b2c71b0e58
work_keys_str_mv	AT tetsuoyasuoka modifiedstressintensityfactorasacrackgrowthparameterapplicableunderlargescaleyieldingconditions AT yoshihiromizutani modifiedstressintensityfactorasacrackgrowthparameterapplicableunderlargescaleyieldingconditions AT akiratodoroki modifiedstressintensityfactorasacrackgrowthparameterapplicableunderlargescaleyieldingconditions
_version_	1718409791903105024

Modified stress intensity factor as a crack growth parameter applicable under large scale yielding conditions

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