A study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise

The prevention of excessive deformation by thermal ratcheting is important in the design of high-temperature components of fast breeder reactors (FBR). This includes evaluation methods for a new type of thermal ratcheting caused by an axial traveling of temperature distribution, which corresponds to...

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Autor principal:	Satoshi OKAJIMA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	ratcheting plastic strain thermal stress traveling temperature distribution finite element analyses Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/46277c171c2842fd904ce90bc63ed942
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spelling	oai:doaj.org-article:46277c171c2842fd904ce90bc63ed9422021-11-26T06:51:30ZA study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise2187-974510.1299/mej.15-00574https://doaj.org/article/46277c171c2842fd904ce90bc63ed9422016-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/3/3_15-00574/_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). This includes evaluation methods for a new type of thermal ratcheting caused by an axial traveling of temperature distribution, which corresponds to moving-up of liquid sodium surface in startup phase. Long range traveling of the axial temperature distribution brings flat plastic deformation profile in wide range. Therefore, at the center of this range, residual stress that brings shakedown behavior does not accumulate. As a result, repeating of this temperature traveling brings continuous accumulation of the plastic strain, even if there is no primary stress. In contrast, in the case with short range traveling, residual stress is caused by constraint against elastic part, and finally it results in shakedown. Because of this mechanism, we supposed that limit for the shakedown behavior depends on distance from the elastic part (i.e. half length of region with plastic deformation). In this paper, we examined characteristics of the accumulation of the plastic strain caused by realistic heat transients, namely, traveling of temperature distribution synchronizing with temperature rise. This examination was based on finite element analyses using elastic-perfectly plastic material. As a result, we confirmed that the shakedown limit depends not on the traveling range of the temperature distribution but the plastic deformation range, which was predicted by the elastic analysis. In the actual application, we can control the plastic deformation range by changing rate of the moving-up of liquid sodium surface.Satoshi OKAJIMAThe Japan Society of Mechanical Engineersarticleratchetingplastic strainthermal stresstraveling temperature distributionfinite element analysesMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 3, Pp 15-00574-15-00574 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	ratcheting plastic strain thermal stress traveling temperature distribution finite element analyses Mechanical engineering and machinery TJ1-1570
spellingShingle	ratcheting plastic strain thermal stress traveling temperature distribution finite element analyses Mechanical engineering and machinery TJ1-1570 Satoshi OKAJIMA A study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise
description	The prevention of excessive deformation by thermal ratcheting is important in the design of high-temperature components of fast breeder reactors (FBR). This includes evaluation methods for a new type of thermal ratcheting caused by an axial traveling of temperature distribution, which corresponds to moving-up of liquid sodium surface in startup phase. Long range traveling of the axial temperature distribution brings flat plastic deformation profile in wide range. Therefore, at the center of this range, residual stress that brings shakedown behavior does not accumulate. As a result, repeating of this temperature traveling brings continuous accumulation of the plastic strain, even if there is no primary stress. In contrast, in the case with short range traveling, residual stress is caused by constraint against elastic part, and finally it results in shakedown. Because of this mechanism, we supposed that limit for the shakedown behavior depends on distance from the elastic part (i.e. half length of region with plastic deformation). In this paper, we examined characteristics of the accumulation of the plastic strain caused by realistic heat transients, namely, traveling of temperature distribution synchronizing with temperature rise. This examination was based on finite element analyses using elastic-perfectly plastic material. As a result, we confirmed that the shakedown limit depends not on the traveling range of the temperature distribution but the plastic deformation range, which was predicted by the elastic analysis. In the actual application, we can control the plastic deformation range by changing rate of the moving-up of liquid sodium surface.
format	article
author	Satoshi OKAJIMA
author_facet	Satoshi OKAJIMA
author_sort	Satoshi OKAJIMA
title	A study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise
title_short	A study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise
title_full	A study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise
title_fullStr	A study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise
title_full_unstemmed	A study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise
title_sort	study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/46277c171c2842fd904ce90bc63ed942
work_keys_str_mv	AT satoshiokajima astudyonplasticstrainaccumulationcausedbytravelingoftemperaturedistributionsynchronizingwithtemperaturerise AT satoshiokajima studyonplasticstrainaccumulationcausedbytravelingoftemperaturedistributionsynchronizingwithtemperaturerise
_version_	1718409716210597888

A study on plastic strain accumulation caused by traveling of temperature distribution synchronizing with temperature rise

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