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RISS 인기검색어
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- 저자 : 권효성(Hyo Seong Gwon) (검색결과 5 건)
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권효성(Hyo Seong Gwon),남기우(Ki Woo Nam),김남석(Nam Seok Kim),김현수(Hyun Soo Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
본 연구에서 다양한 국부 감육 형상, 감육 길이 및 감육 깊이를 가지는 탄소강 배관의 파손시험을 실시하였다. 시험은 내압이 작용하에 실시하였다. 감육 배관의 손상 모드는 내압, 감육 길이 및 감육 깊이에 의존하는 것으로 나타났다. 감육 배관의 원주 방향 변형율은 스트레인 게이지를 사용하여 측정하였고, 유한 요소 해석에서 얻어진 결과와 비교하였다. 원주 방향 변형율이 0.2% 이상일 때, 감육 배관의 파손이 시작되었다. In this study, the pipe failure tests were performed on carbon steel pipe with various local wall thinning shapes, wall thinning length, wall thinning depth. The tests were conducted under internal pressure. The results of tests showed that failure mode of wall thinned pipe depended on magnitude of internal pressure and wall thinning length as well as wall thinning depth. The circumferential strain of wall thinned pipe was measured by using strain gage and compared with that estimated by using finite element analyses(FEA). When circumferential strain was over 0.2%, failure of wall thinned pipe began.
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권효성(Hyo Seong Gwon),남기우(Ki Woo Nam) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Assume that a load is applied inside of a safety block which prevents drop of laborers at high altitude, the load was analyzed by finite element method. Elastic analysis was done by Ansys ver. 11.0. and tetrahedral meshing was used. As load applied more vertically at the fixed face of saw tooth, the stress concentration became smaller and the load distributed broader. When load worked at saw tooth and the shape was more straight to the direction of load, most stresses except principal stress became smaller. When the area of the load increased, principal stress and equivalent stress could be decreased simultaneously. A principal stress and other various stresses occurred in 3D shape, therefore revised model which has smaller equivalent stress than other models shows excellence on the stability and the credibility.
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내압이 작용하는 고압탄소강배관의 파손에 미치는 감육의 영향
권효성(Hyo-Seong Gwon),남기우(Ki-Woo Nam) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Fracture behavior and pipe strength are very important to the integrity of energy plants' and ocean structures. The pipes of energy plants and ocean structures are subject to local wall thinning, resulting from severe erosion-corrosion damage. Therefore, evaluation of failure pressure and fracture behavior of pipes in energy plants, ocean structes must be needed for getting integrity of them. In this study, the pipe failure tests were performed on carbon steel pipe with various local wall thinning shapes, wall thinning length, wall thinning depth. The tests were conducted under internal pressure. The results of tests showed that failure mode of wall thinned pipe depended on magnitude of internal pressure and wall thinning length as well as wall thinning depth. The circumferential strain of wall thinned pipe was measured by using strain gage. When circumferential strain was over 0.2%, failure of wall thinned pipe began. and twice of pressure at 0.2% circumferential strain was needed to burst pipe with t/T=0.1, L=102mm. When the pressure was reached at failure pressure, wall thinned area of STS370 pipe burst as a result of plastic behavior with large plastic deformation
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남기우(Ki Woo Nam),권효성(Hyo Seong Gwon) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
Fracture behavior and pipe strength are very important to the integrity of energy plants. The pipes of energy plants are subject to local wallthinning, resulting from. severe erosion-corrosion damage. Therefore, evaluation of failure pressure and fracture behavior of pipes in energy plants must be needed for getting integrity of them. In this study, the pipe failure tests were performed on carbon steel pipe with various local wall thinning shapes, wall thinning length, wall thinning depth. The tests were conducted under internal pressure. The results of tests showed that failure mode of wall thinned pipe depended on magnitude of internal pressure and wall th inning length as well as wall thinning depth .In this study, we investigated Acoustic emission signal by burst test and the results of the frequency range would be expected to be basic data that inspect energy plant in real-time
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