Effects of thermal load and cooling condition on weld residual stress in a core shroud with numerical simulation

Li, Yongkui; Kaji, Yoshiyuki; Igarashi, Takahiro

doi:10.1016/j.nucengdes.2011.10.040

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…XFEM makes it more accurate and efficient to simulate the crack propagation, which could avoid the mesh inadaptability during the welding simulation and its crack simulation. It also provides a reference for predicting SCC extension rate of nuclear welding materials and its remaining service life prediction of SG based on improved F-A model [1][2][3].…”

Section: Structural Integrity Assessmentmentioning

confidence: 99%

“…Information indicates that welding residual stress is the main cause of stress corrosion cracking. The key point for the life prediction and integrity assessment [1][2][3] of SG safety end is the exactly characterize of crack-tip stress field under welding residual stress field. Nowadays, many methods have been proposed to solve crack growth problems [4] , such as boundary element method [5] , meshless method [6] , mesh updated finite element method [7] and so on.…”

Section: Introductionmentioning

confidence: 99%

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Crack Tip Stress Analysis of the Steam Generator Dissimilar Steel Welded Joint under Residual Stress Field

Zhu

Xia

et al. 2019

KEM

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An typical mode of a structural integrity failure in dissimilar steel welded joints. This paper aims at studying crack tip stress of a steam generator dissimilar welded joint under residual stress field with the method of interaction integral and XFEM. Firstly, the corresponding weak form is obtained where the initial stress field is involved, which is the key step for the XFEM. Then, the interaction integral is applying to calculate the stress intensity factor. In addition, two simple benchmark problems are simulated in order to verify the precision of this numerical method. Finally, this numerical method is applying to calculate the crack tip SIF of the addressed problem. This study finds that the stress intensity factor increases firstly then decreases with the deepening of the crack. The main preponderance of this method concerns avoiding mesh update by take advantage of XFEM when simulating crack propagation, which could avoid double counting. In addition, our obtained results will contribute to the safe assessment of the nuclear power plant steam generator.

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Section: Structural Integrity Assessmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crack Tip Stress Analysis of the Steam Generator Dissimilar Steel Welded Joint under Residual Stress Field

Zhu

Xia

et al. 2019

KEM

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“…A taxa de resfriamento (controlando as características metalúrgicas/propriedades mecânicas) é o segundo parâmetro independente na geração de TT, segundo Figura 3. Enquanto alguns autores, como, por exemplo, Jiang e Yahiaoui (2008), Li et al (2012) e Sudheesh e Prasad (2011) declaram que uma taxa de resfriamento elevada é benéfica à redução de TR, outros, como, Choi e Mazumder (2002) afirmam o contrário (aumento das TR de tração no sentido transversal na ZF e ZAC com aumento da velocidade de soldagem). A situação torna-se mais complicada quando se estuda TR em aços que sofrem transformações metalúrgicas no estado sólido.…”

Section: O Efeito Das Transformações Metalúrgicas Sobre Ttunclassified

“…Existem outras discordâncias na literatura sobre o papel das transformacos metalúrgicas, que são função da taxa de resfriamento. Enquanto alguns autores, como, por exemplo, Jiang e Yahiaoui (2008), Li et al (2012) e Sudheesh e Prasad (2011) declaram que uma taxa de resfriamento elevada é benéfica à redução de TR, outros, como, Choi e Mazumder (2002) afirmam o contrário. A situação torna-se mais complicada quando se estuda TR em aços que sofrem transformações metalúrgicas no estado sólido.…”

Section: Já No Trabalhounclassified

Tensões Residuais em Soldagem a Arco: Uma Visão Holística

Міщенко

Scotti

2018

Soldag. insp.

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Resumo Encontram-se muitos exemplos na literatura onde se faz suposições relativas às tensões residuais que raramente são confirmadas na prática. Para validar esse enunciado, neste trabalho é apresentada uma visão crítica sobre o assunto através de uma revisão bibliográfica. Verificou-se uma série de resultados antagônicos quando pesquisadores tentaram, tanto experimentalmente, como por simulação, definir, quantificar, ou mesmo qualificar, o efeito separado de cada fator sobre a geração de tensões residuais. Concluiu-se que a razão para tal seria a falta de uma visão holística para estudar o assunto. Por isto, é proposto um diagrama que lista e classifica os fatores governantes na geração de tensões residuais como independentes e secundários, visando facilitar o entendimento do efeito de cada fator. Verificou-se também uma não harmonização, tanto na simbologia, como na terminologia, dos eixos e componentes das tensões residuais nas publicações. Dessa forma, se apresenta também uma proposta de simbologia e terminologia, com a intenção de facilitar a compreensão e transportabilidade de resultados. Espera-se, assim, ter este trabalho contribuído para um melhor entendimento das razões para que as suposições da literatura nem sempre sejam confirmadas na prática

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“…Jiang and Yahiaoui [7] presented a three-dimensional thermomechanical model to investigate the effect of welding sequences on the residual stress field in a multipass welded piping branch junction. Li et al [8] dealt with water cooling effects on welding residual stresses in a core shroud. In their contribution, Moat et al [9] concluded that martensitic filler metals with low transformation temperatures can efficiently reduce the welding residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Longitudinal Residual Stresses and Deflections in a T-joint Welded Structure Using a Local Preheating Technique

et al. 2018

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In this paper a numerical analysis of a T-joint fillet weld is performed to investigate the influences of different preheat temperatures and the interpass time on the longitudinal residual stress fields and structure deflections. In the frame of the numerical investigations, two thermo-mechanical finite element models, denoted M2 and M3, were analyzed and the results obtained were then compared with the model M1, where the preheating technique was not applied. It is concluded that by applying the preheat temperature prior to the start of welding the post-welding deformations of welded structures can be significantly reduced. The increase of the preheat temperature increased the longitudinal residual stress field at the ends of the plates. The influence of the interpass time between two weld passes on the longitudinal residual stress state and plate deflection was investigated on two preheated numerical models, M4 and M5, with an interpass time of 60 s and 120 s, respectively. The results obtained were then compared with the preheated model M3, where there was no time gap between the two weld passes. It can be concluded that with the increase of interpass time, the plate deflections significantly increase, while the influence of the interpass time on the longitudinal residual stress field can be neglected.

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Effects of thermal load and cooling condition on weld residual stress in a core shroud with numerical simulation

Cited by 10 publications

References 8 publications

Crack Tip Stress Analysis of the Steam Generator Dissimilar Steel Welded Joint under Residual Stress Field

Crack Tip Stress Analysis of the Steam Generator Dissimilar Steel Welded Joint under Residual Stress Field

Tensões Residuais em Soldagem a Arco: Uma Visão Holística

Numerical Analysis of Longitudinal Residual Stresses and Deflections in a T-joint Welded Structure Using a Local Preheating Technique

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