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이상철(S. C. Lee),심덕남(D. N. Shim),공창식(C. S. Kong) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.11
Component reliability is most important in nuclear power plants and other large industrial plants. For example, steam generator failures are very costly and dangerous, in terms of lost production as shutdown and drain radioactive. In the fabrication of steam generator, the tubes are attached to the tubesheet by means of an expansion process, including mechanical rolling, explosive expansion and hydraulic expansion. Tube expansion by its nature creates a high level of residual stresses in the tube wall. Residual stress, combined with the interference, create a stress field which increases the susceptibility of the tube to stress-corrosion cracking(SCC) with its costly consequences. This paper presents an experimental technique for the detailed determination of the state of residual stress, evaluation of the residual stresses in the three expansion methods.