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오창균(C.K. Oh),심희진(H.J. Shim),김현수(H.S. Kim),정성규(S.G. Jung),허남수(N.S. Huh) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Threaded members have been regarded as an important structural elements and can influence significantly the strength and endurance of the whole structure. Further, in terms of crack initiation and propagation, threaded members have to maintain the enough safety margin under variable loads during operation. Therefore it is necessary to perform an accurate safety analysis for the component integrity and reliability. In this study, an integrity evaluation procedure for bolting products in the component supports of the operating nuclear power plants was presented. In addition, detailed finite element analyses were performed for component support in order to determine actual stresses under the preload condition. Based on these results, the safety margin for a proloaded threaded fastener was evaluated for two kinds of operating conditions. Analysis results show that the threaded fastener has enough safety margin for both normal and accident conditions.
삼축응력 기반의 파괴변형률 기준을 적용한 가우지 손상배관의 건전성 평가
오창균(C. K. Oh),김윤재(Y. J. Kim),박진무(J. M. Park),백종현(J. H. Baek),김영표(Y. P. Kim),김우식(W. S. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Structural integrity assessment of defected pipe is important in fitness for service evaluation and proper engineering assessment is needed to determine whether pipelines are still fit for service. This paper present a failure prediction of gas pipes made of API X65 steel with gouge using stress-modified true fracture strain, which is regarded as a criterion of ductile fracture. For this purpose, API X65 pipes with gouge are simulated using elastic-plastic FE analyses with the proposed ductile failure criterion and the resulting burst pressures are compared with experimental data. Agreements are quite good, which gives confidence in the use of the proposed criteria to defect assessment for gas pipelines. Then, further extensive finite element analyses are performed to obtain the burst pressure solution of pipes with gouge as a function of defect depth, length and pipeline geometry.
증기발생기 전열관의 구조 건전성 평가를 위한 확률론적 프로그램 개발
김현수(H.S. Kim),심희진(H.J. Shim),오창균(C.K. Oh),정성규(S.G. Jung),장윤석(Y.S. Chang),김홍덕(H.D. Kim),이재봉(J.B. Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The steam generator in a nuclear power plant is a large heat exchanger with thousands of thin-walled tubes and comprises over 50% of the total primary pressure-retaining boundary. Failure of the steam generator tubes can result in release of fission products to the environment outside. Therefore, an accurate integrity assessment of the tubes is of great importance for maintaining the safety of a nuclear power plant. With regard to the structural integrity assessment for a cracked and/or flawed tube, most of the preceding researches have been focused on the deterministic approach. However, due to inherent uncertainties such as material property, crack/flaw sizing and so on, the deterministic approach can not produce realistic result. In this research, therefore, a computer program for probabilistic integrity assessment was developed in MS Windows environment. This program covers axial crack, circumferential crack and wear flaw, and can be used in practical integrity assessment of steam generator tube.