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지진 하중조건에서 배관 건전성 평가를 위한 실험적 연구 현황
김진원,김종성,김윤재,권형도,Kim, Jin Weon,Kim, Jong Sung,Kim, Yun Jae,Kweon, Hyeong Do 한국압력기기공학회 2017 한국압력기기공학회 논문집 Vol.13 No.1
This paper reviewed and summarized the experimental studies conducted during last three decades to evaluate the structural integrity and to establish the acceptance criteria for piping system of nuclear power plants (NPPs) under seismic loading condition. These experimental studies contain the results of large-scale piping system tests under excessive seismic loading as well as standard specimen tests, simplified piping specimen tests, and piping components tests under simplified dynamic and cyclic loading. These would be useful as a basis for establishing integrity assessment procedure and acceptance criteria for piping systems of NPPs under beyond design basis earthquake (BDBE) conditions, and also could be used in planing the scope and direction of further related researches.
반복 응력-변형률 시험을 통한 반복하중 조건에서 원전 주요 구조재료의 변형거동 평가
김진원,김종성,권형도,Kim, Jin Weon,Kim, Jong Sung,Kweon, Hyeong Do 한국압력기기공학회 2017 한국압력기기공학회 논문집 Vol.13 No.1
This study investigated deformation behavior of major nuclear structural materials under cyclic loading conditions via cyclic stress-strain test. The cyclic stress-strain tests were conducted on SA312 TP316 stainless steel and SA508 Gr.3 Cl.1 low-alloy steel, which are used as materials for primary piping and reactor pressure vessel nozzle respectively, under cyclic load with constant strain amplitude and constant load amplitude at room temperature (RT) and $316^{\circ}C$. From the results of tests, the cyclic hardening and softening behavior, stabilized cyclic stress-strain behavior, and ratcheting behavior of both materials were investigated at both RT and $316^{\circ}C$. In addition, appropriate considerations for cyclic deformation behavior in the structural integrity evaluation of major nuclear components under excessive seismic condition were discussed.
김진원,이성호,Kim, Jin Weon,Lee, Sung Ho 한국압력기기공학회 2011 한국압력기기공학회 논문집 Vol.7 No.1
The objective of this study is to classify the geometry of wall-thinning defect that causes a circumferential crack in the pipe elbows subjected to internal pressure. For this objective, first of all a criterion to determine the occurrence of circumferential cracking at wall-thinned area was developed based on finite element simulation for burst tests of pipe elbow specimens that showed axial and circumferential cracking at wall-thinned area. In addition, parametric finite element analysis including various wall-thinning geometries, locations, and pipe geometries was conducted and the wall-thinning geometries that initiate circumferential crack were determined by applying the criterion to the results of parametric analysis. It showed that the circumferential crack occurs at wall-thinning defect, which has a deep, wide, and short geometry. Also, it is indicated that the pipe elbows with larger radius to thickness ratio are more susceptible to circumferential cracking at wall-thinned area.
김진원,박치용,이성호,Kim, Jin-Weon,Park, Chi-Yong,Lee, Sung-Ho 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.10
This study performed a series of burst tests at ambient temperature using real-scale elbow specimen containing a local wall-thinning defect at it's intrados or extrados and evaluated failure pressure of locally wall-thinned elbows. In the experiment, a 90-degree 100A, Sch. 80 standard elbow was employed, and various wall-thinning geometries, such as length, depth, and circumferential angle, were considered. From the results of experiment, the dependences of failure pressure of wall-thinned elbows on the defect geometries and locations were investigated. In addition, the reliability of existing models was examined by comparing the tests data with the results predicted from existing failure pressure evaluation models for locally wall-thinned elbow.
LBB 평가를 위한 J-R 파괴인성시험 결과에 미치는 시편 형상과 측면 홈의 영향
김진원(Jin Weon Kim),최명락(Myung Rak Choi),오영진(Young Jin Oh),박흥배(Heung Bae Park),김경수(Kyung Su Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This study performed to investigate the effect of specimen size and side-groove on the results of J-R test for leak-before-break (LBB) evaluation. For this purpose, a series of J-R tests were conducted at RT and 316oC using three different sizes of compact tension (CT) specimens, 12.7mm thick 1T CT, 25.4mm thick 1T CT, and 25.4mm thick 2T CT, with and without side-groove. The specimens were machined from SA508 Gr.1a piping material. The results showed that J-R curves tested from CT specimens with side-groove were nearly independent of specimen size, although they slightly increased with decreasing thickness. However, J-R curves tested from CT specimens without side-groove were dependent on specimen thickness. Regardless of test temperature and specimen size, side-grooving reduced J-R curve.