Leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch

Nuclear power plants and chemical plants contain many piping, which degrades with age. As a result of a reduction in structural strength, guillotine breaking and rupturing can occur, leading to severe damage to plants. Piping is subjected to various types of tension and bending, but the influence of...

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Autores principales:	Masato OGAWA, Masaaki MATSUBARA, Ryosuke SUZUKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	stainless steel pipe integrity assessment leak-before-break plastic collapse strength des method Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/786319af2cec4b0fbf3eba6a53bccc69
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spelling	oai:doaj.org-article:786319af2cec4b0fbf3eba6a53bccc692021-11-29T05:56:30ZLeak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch2187-974510.1299/mej.19-00559https://doaj.org/article/786319af2cec4b0fbf3eba6a53bccc692020-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/3/7_19-00559/_pdf/-char/enhttps://doaj.org/toc/2187-9745Nuclear power plants and chemical plants contain many piping, which degrades with age. As a result of a reduction in structural strength, guillotine breaking and rupturing can occur, leading to severe damage to plants. Piping is subjected to various types of tension and bending, but the influence of the load history on the integrity of piping containing a flaw is poorly understood. The goal of the present study was to develop an improved integrity assessment method for a stainless steel pipe with a part-through notch that takes into account the load history. This involved first determining the feasibility of the leak-before-break (LBB) concept for piping subjected to a combined load and then evaluating the stress at the crack penetration point and estimating the plastic collapse strength. An austenitic stainless steel pipe (SUS 304) with a length of 110 mm, a diameter of 32 mm, and a wall thickness of 3 mm was used as a specimen. A part-through notch with a notch angle of 90° was cut in the center of the specimen by wire electric discharge machining. Loading tests were carried out using statically indeterminate fracture mechanics testing equipment developed by ourselves. This allowed the loading history to be varied because the equipment is capable of applying arbitrary sequences of tension and bending. The LBB concept is considered to be applicable if the crack penetrates before reaching the maximum stress. The plastic collapse strength was then determined using the double elastic slope method. The LBB concept was found to be applicable. In addition, the stress at the crack penetration point was approximately equal to the maximum stress. The results of the present study indicated that the plastic collapse strength of a part-through notched specimen can be safely estimated using the theoretical plastic collapse strength of a through-wall notched pipe.Masato OGAWAMasaaki MATSUBARARyosuke SUZUKIThe Japan Society of Mechanical Engineersarticlestainless steel pipeintegrity assessmentleak-before-breakplastic collapse strengthdes methodMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 3, Pp 19-00559-19-00559 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	stainless steel pipe integrity assessment leak-before-break plastic collapse strength des method Mechanical engineering and machinery TJ1-1570
spellingShingle	stainless steel pipe integrity assessment leak-before-break plastic collapse strength des method Mechanical engineering and machinery TJ1-1570 Masato OGAWA Masaaki MATSUBARA Ryosuke SUZUKI Leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch
description	Nuclear power plants and chemical plants contain many piping, which degrades with age. As a result of a reduction in structural strength, guillotine breaking and rupturing can occur, leading to severe damage to plants. Piping is subjected to various types of tension and bending, but the influence of the load history on the integrity of piping containing a flaw is poorly understood. The goal of the present study was to develop an improved integrity assessment method for a stainless steel pipe with a part-through notch that takes into account the load history. This involved first determining the feasibility of the leak-before-break (LBB) concept for piping subjected to a combined load and then evaluating the stress at the crack penetration point and estimating the plastic collapse strength. An austenitic stainless steel pipe (SUS 304) with a length of 110 mm, a diameter of 32 mm, and a wall thickness of 3 mm was used as a specimen. A part-through notch with a notch angle of 90° was cut in the center of the specimen by wire electric discharge machining. Loading tests were carried out using statically indeterminate fracture mechanics testing equipment developed by ourselves. This allowed the loading history to be varied because the equipment is capable of applying arbitrary sequences of tension and bending. The LBB concept is considered to be applicable if the crack penetrates before reaching the maximum stress. The plastic collapse strength was then determined using the double elastic slope method. The LBB concept was found to be applicable. In addition, the stress at the crack penetration point was approximately equal to the maximum stress. The results of the present study indicated that the plastic collapse strength of a part-through notched specimen can be safely estimated using the theoretical plastic collapse strength of a through-wall notched pipe.
format	article
author	Masato OGAWA Masaaki MATSUBARA Ryosuke SUZUKI
author_facet	Masato OGAWA Masaaki MATSUBARA Ryosuke SUZUKI
author_sort	Masato OGAWA
title	Leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch
title_short	Leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch
title_full	Leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch
title_fullStr	Leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch
title_full_unstemmed	Leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch
title_sort	leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/786319af2cec4b0fbf3eba6a53bccc69
work_keys_str_mv	AT masatoogawa leakbeforebreakandplasticcollapsestrengthevaluationofstainlesssteelpipingwithapartthroughnotch AT masaakimatsubara leakbeforebreakandplasticcollapsestrengthevaluationofstainlesssteelpipingwithapartthroughnotch AT ryosukesuzuki leakbeforebreakandplasticcollapsestrengthevaluationofstainlesssteelpipingwithapartthroughnotch
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Leak-before-break and plastic collapse strength evaluation of stainless steel piping with a part-through notch

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