Flaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service

The current JSME rules on Fitness-for-Service only applies the Elastic Plastic Fracture Mechanics (EPFM) method, including the two-parameters method for flaw evaluation of cast stainless steel (CASS) pipes, while plastic collapse is expected to occur in the case of low ferrite content or low thermal...

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Autores principales:	Kiminobu HOJO, Mayumi OCHI, Naoki OGAWA, Shotaro HAYASHI, Wataru NISHI, Takahisa YAMANE
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	cast stainless steel net section criterion limit load ductile fracture j-integral two-parameters method j-t criterion allowable flaw rules on fitness-for-service j-r curve thermal aging epfm z-factor Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/642130283d154e64abac561f6e649705
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spelling	oai:doaj.org-article:642130283d154e64abac561f6e6497052021-11-26T07:06:30ZFlaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service2187-974510.1299/mej.16-00642https://doaj.org/article/642130283d154e64abac561f6e6497052017-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/4/4_16-00642/_pdf/-char/enhttps://doaj.org/toc/2187-9745The current JSME rules on Fitness-for-Service only applies the Elastic Plastic Fracture Mechanics (EPFM) method, including the two-parameters method for flaw evaluation of cast stainless steel (CASS) pipes, while plastic collapse is expected to occur in the case of low ferrite content or low thermal aging condition. The EPFM method of the JSME rules introduces Z-factor for simplification similar to ASME Sec. XI. The Z-factor equation for CASS pipe was derived with the assumption of a penetrated circumferential flaw, 20% ferrite content, J-R curve of fully aged material, and stress-strain (S-S) curve of unaged material, which are very conservative conditions. In order to revise the current JSME rules for a more practical and accurate flaw evaluation of CASS pipe, this paper introduced to the rules, a limit load method for low ferrite content or low thermal aging condition, and prediction models of S-S and J-R curves for thermal aging. These were verified by fracture tests using flat plate specimens with a surface flaw and detailed FE analyses. Also applicability of a Z-factor equation for an axial flaw was proposed by other authors. This paper is a technical basis for the code revision of the JSME rules.Kiminobu HOJOMayumi OCHINaoki OGAWAShotaro HAYASHIWataru NISHITakahisa YAMANEThe Japan Society of Mechanical Engineersarticlecast stainless steelnet section criterionlimit loadductile fracturej-integraltwo-parameters methodj-t criterionallowable flawrules on fitness-for-servicej-r curvethermal agingepfmz-factorMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 4, Pp 16-00642-16-00642 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	cast stainless steel net section criterion limit load ductile fracture j-integral two-parameters method j-t criterion allowable flaw rules on fitness-for-service j-r curve thermal aging epfm z-factor Mechanical engineering and machinery TJ1-1570
spellingShingle	cast stainless steel net section criterion limit load ductile fracture j-integral two-parameters method j-t criterion allowable flaw rules on fitness-for-service j-r curve thermal aging epfm z-factor Mechanical engineering and machinery TJ1-1570 Kiminobu HOJO Mayumi OCHI Naoki OGAWA Shotaro HAYASHI Wataru NISHI Takahisa YAMANE Flaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service
description	The current JSME rules on Fitness-for-Service only applies the Elastic Plastic Fracture Mechanics (EPFM) method, including the two-parameters method for flaw evaluation of cast stainless steel (CASS) pipes, while plastic collapse is expected to occur in the case of low ferrite content or low thermal aging condition. The EPFM method of the JSME rules introduces Z-factor for simplification similar to ASME Sec. XI. The Z-factor equation for CASS pipe was derived with the assumption of a penetrated circumferential flaw, 20% ferrite content, J-R curve of fully aged material, and stress-strain (S-S) curve of unaged material, which are very conservative conditions. In order to revise the current JSME rules for a more practical and accurate flaw evaluation of CASS pipe, this paper introduced to the rules, a limit load method for low ferrite content or low thermal aging condition, and prediction models of S-S and J-R curves for thermal aging. These were verified by fracture tests using flat plate specimens with a surface flaw and detailed FE analyses. Also applicability of a Z-factor equation for an axial flaw was proposed by other authors. This paper is a technical basis for the code revision of the JSME rules.
format	article
author	Kiminobu HOJO Mayumi OCHI Naoki OGAWA Shotaro HAYASHI Wataru NISHI Takahisa YAMANE
author_facet	Kiminobu HOJO Mayumi OCHI Naoki OGAWA Shotaro HAYASHI Wataru NISHI Takahisa YAMANE
author_sort	Kiminobu HOJO
title	Flaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service
title_short	Flaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service
title_full	Flaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service
title_fullStr	Flaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service
title_full_unstemmed	Flaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service
title_sort	flaw evaluation of cast stainless steel pipe for revision of jsme rules on fitness for service
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/642130283d154e64abac561f6e649705
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Flaw evaluation of cast stainless steel pipe for revision of JSME rules on fitness for service

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