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Evaluation of the Crack Tip Stress Distribution Considering Constraint Effects in the Reactor Pressure Vessel
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 Title & Authors
Evaluation of the Crack Tip Stress Distribution Considering Constraint Effects in the Reactor Pressure Vessel
Kim, Jin-Su; Choe, Jae-Bung; Kim, Yeong-Jin;
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 Abstract
In the process of integrity evaluation for nuclear power plant components, a series of fracture mechanics evaluation on surface cracks in reactor pressure vessel(RPV) must be conducted. These fracture mechanics evaluation are based on stress intensity factor, K. However, under pressurized thermal shock(PTS) conditions, the combination of thermal and mechanical stress by steep temperature gradient and internal pressure causes considerably high tensile stress at the inside of RPV wall. Besides, the internal pressure during the normal operation produces high tensile stress at the RPV wall. As a result, cracks on inner surface of RPVs may experience elastic-plastic behavior which can be explained with J-integral. In such a case, however, J-integral may possibly lose its validity due to constraint effect. In this paper, in order to verify the suitability of J-integral, tow dimensional finite element analyses were applied for various surface cracks. A total of 18 crack geometries were analyzed, and stresses were obtained by comparing resulting HRR stress distribution with corresponding actual stress distributions. In conclusion, HRR stress fields were found to overestimate the actual crack-tip stress field due to constraint effect.
 Keywords
Reactor Pressure;Pressurized Thermal Shock;Constraint Effect; Stress;HRR Stress;
 Language
Korean
 Cited by
1.
PTS 사고하에서 J-Q해석법을 이용한 표면균열의 구속효과 고찰,김진수;최재붕;김윤재;김영진;

대한기계학회논문집A, 2002. vol.26. 1, pp.105-112 crossref(new window)
2.
양측균열인장(DE(T)) 평판의 J-적분 시험을 위한 소성 η계수,손범구;심도준;김윤재;김영진;

대한기계학회논문집A, 2004. vol.28. 3, pp.259-266 crossref(new window)
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