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자료유형
학술저널
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한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제51권 제5호
발행연도
2019.1
수록면
1,451 - 1,469 (19page)

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This paper proposes a residual stress mitigation of a nuclear safety-related austenitic stainless steelTP304 pipe bended by local induction heating process via performing elastic-plastic finite elementanalysis. Residual stress distributions of the pipe bend were calculated by performing finite elementanalysis. Validity of the finite element analysis procedure was verified via comparing with temperaturehistories measured by using thermocouples, ultrasonic thickness measurement results, and residualstress measurement results by a hole-drilling method. Parametric finite element stress analysis wasperformed to investigate effects of the process and geometric shape variables on the residual stresses oninner surfaces of the pipe by applying the verified procedure. As a result of the parametric analysis, it wasfound that it is difficult to considerably reduce the inner surface residual stresses by changing theexisting process and geometric shape variables. So, in order to mitigate the residual stresses, effect of anadditional process such as cooling after the bending on the residual stresses was investigated. Finally, itwas identified that the additional heating after the bending can significantly reduce the residual stresseswhile other variables have insignificant effect

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