Residual Stress Redistribution on Welds of Nuclear Component by Mechanical Stress Relieving Methods

Lee, Se-Hwan; Kim, Jong-Sung; Jin, Tae-Eun

Journal of KWJS 2004;22(2):51-58.
Published online September 15, 2004.

[연구논문] 기계적 응력이완 방법에 의한 원전기기 용접부의 잔류응력 재분포

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Residual Stress Redistribution on Welds of Nuclear Component by Mechanical Stress Relieving Methods

Se-Hwan Lee, Jong-Sung Kim, Tae-Eun Jin

Abstract

Residual stresses, which can be produced during the welding process, play an important role in an industrial field. Welding residual stresses are exerting negative effect on the fatigue behavior and integrity of structure. In this study, as a result of the thermal elasto-plastic finite element analysis for the welds of a nuclear component, the residual stress distributions are estimated for as-welded condition. Also, finite element techniques are developed to simulate the relaxation of the residual stresses according to the various mechanical stress relieving(MSR) loads such as hydrostatic pressure loading, tensile pipe-end loading, and mechanical stress improvement process(MSIP) loading. Finally, the results of residual stress redistributions for various loading conditions are compared and reviewed qualitatively and quantitatively to fine an optimum loading condition.