Study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution

The prevention of excessive deformation by thermal ratcheting is important in the design of high-temperature components of fast breeder reactors (FBR). In an experimental study that simulated a fast breeder reactor vessel near the coolant surface, it was reported that the long distance travel of tem...

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Autores principales:	Satoshi OKAJIMA, Takashi WAKAI, Nobuchika KAWASAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	ratcheting plastic strain thermal stress traveling temperature distribution finite element analysis Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/3deeb9e30b694914925882c1d4a4cdeb
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spelling	oai:doaj.org-article:3deeb9e30b694914925882c1d4a4cdeb2021-11-26T07:11:27ZStudy on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution2187-974510.1299/mej.16-00641https://doaj.org/article/3deeb9e30b694914925882c1d4a4cdeb2017-05-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_16-00641/_pdf/-char/enhttps://doaj.org/toc/2187-9745The prevention of excessive deformation by thermal ratcheting is important in the design of high-temperature components of fast breeder reactors (FBR). In an experimental study that simulated a fast breeder reactor vessel near the coolant surface, it was reported that the long distance travel of temperature distribution causes a new type of thermal ratcheting, even in the absence of primary stress. In this paper, we propose a simple screening criterion to prevent continuous accumulation of plastic strain derived from long distance travel of temperature distribution. The major cause of this ratcheting is the lack of residual stress that brings shakedown behavior at the center of yielding area. Because residual stresses are derived from constraint by the neighboring elastic region, we focused on the distance from the center of yielding area to the elastic region. Accordingly, the proposed criterion restricts the axial length of the full-section yield area, which is the double of the above distance. We validated the proposed criterion based on finite element analyses using an elastic-perfectly plastic material. As a result of the validation analyses, we confirmed that the accumulation of plastic strain saturates before second cycles in the cases satisfying the proposed criterion, regardless of the shape of temperature distribution.Satoshi OKAJIMATakashi WAKAINobuchika KAWASAKIThe Japan Society of Mechanical Engineersarticleratchetingplastic strainthermal stresstraveling temperature distributionfinite element analysisMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 16-00641-16-00641 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	ratcheting plastic strain thermal stress traveling temperature distribution finite element analysis Mechanical engineering and machinery TJ1-1570
spellingShingle	ratcheting plastic strain thermal stress traveling temperature distribution finite element analysis Mechanical engineering and machinery TJ1-1570 Satoshi OKAJIMA Takashi WAKAI Nobuchika KAWASAKI Study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution
description	The prevention of excessive deformation by thermal ratcheting is important in the design of high-temperature components of fast breeder reactors (FBR). In an experimental study that simulated a fast breeder reactor vessel near the coolant surface, it was reported that the long distance travel of temperature distribution causes a new type of thermal ratcheting, even in the absence of primary stress. In this paper, we propose a simple screening criterion to prevent continuous accumulation of plastic strain derived from long distance travel of temperature distribution. The major cause of this ratcheting is the lack of residual stress that brings shakedown behavior at the center of yielding area. Because residual stresses are derived from constraint by the neighboring elastic region, we focused on the distance from the center of yielding area to the elastic region. Accordingly, the proposed criterion restricts the axial length of the full-section yield area, which is the double of the above distance. We validated the proposed criterion based on finite element analyses using an elastic-perfectly plastic material. As a result of the validation analyses, we confirmed that the accumulation of plastic strain saturates before second cycles in the cases satisfying the proposed criterion, regardless of the shape of temperature distribution.
format	article
author	Satoshi OKAJIMA Takashi WAKAI Nobuchika KAWASAKI
author_facet	Satoshi OKAJIMA Takashi WAKAI Nobuchika KAWASAKI
author_sort	Satoshi OKAJIMA
title	Study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution
title_short	Study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution
title_full	Study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution
title_fullStr	Study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution
title_full_unstemmed	Study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution
title_sort	study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/3deeb9e30b694914925882c1d4a4cdeb
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Study on a unified criterion for preventing plastic strain accumulation due to long distance travel of temperature distribution

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