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강자성 배관 외ㆍ내부 벽의 racetrack형 결함깊이와 부피응력이 누설자속에 미치는 영향
유권상(K. S. Ryu),박영태(Y. T. Park),손대락(D. Son),D. L. Atherton(D. L. Atherton),L. Clapham(L. Clapham) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.2
Non-linear anisotropic materials were used to simulate the effects of bulk tensile stress in 3D finite element analysis (FEA). FEA was used to calculate the effects of near and far-side racetrack pit depth and simulated bulk tensile stress on magnetic flux leakage (MFL) signals. The axial and radial MFL signals were depended on near and far-side racetrack pit depth and on the bulk stress, but the circumferential MFL signal was not depended on them. The axial and radial MFL signals increased with greater pit depth and applied bulk stress, but the circumferential MFL signal was scarcely changed.
강자성 배관 외ㆍ내부 면의 이중 원형 결함의 깊이와 응력이 누설자속에 미치는 영향
유권상(K. S. Ryu),박영태(Y. T. Park),손대락(D. Son),D. L. Atherton(D. L. Atherton),L. Clapham(L. Clapham) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.2
Non-linear anisotropic materials were used to simulate the effects of tensile stress in 3D finite element analysis (FEA). FEA was used to calculate the effects of far and near-side pit depth and tensile stress on magnetic flux leakage (MFL) signals. The axial and radial MFL signals were depended on far and near-side double circular pit depth and on the stress, but the circumferential MFL signal was not depended on them. The axial and radial MFL signals increased with greater pit depth and applied stress, but the circumferential MFL signal was scarcely changed.
강자성 배관 외·내부 면의 단일 원형 홈의 깊이와 부피응력이 누설자속에 미치는 영향
유권상,박영태,Atherton, D.L.,Clapham, L. 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.3
누설자속(magnetic flux leakage: MFL) 신호는 매설된 송유관이나 가스관에 생성된 부식결함의 검사에 이용된다. 배관의 외내부 면의 단일 원형 홈(pit) 깊이와 부피응력(bulk stress)이 축(x) 방향, 원주(y) 방향 및 방사상(z) 방향의 누설자 속에 미치는 영향을 3차원 유한요소법을 이용하여 계산하였다. 자기이방성 물질을 이용하여 부피인장응력(bulk tensile stress)과 수직 응력에 의한 MFL 신호변화를 계산하였다. 배관의 축 및 방사상 방향의 MFL 신호는 배관 외내부의 결함 깊이가 깊어질수록, 부피인장응력이 커질수록 MFL 신호는 증가하였다. 그러나 원주 방향의 MFL 신호는 결함 깊이와 부피인장응력에 영향을 거의 받지 않았다. Magnetic flux leakage (MFL) signals were used for corrosion inspection of buried oil and gas pipeline. 3D finite element analysis was used to examine the effects of far and near-side depth and tensile stress on MFL signals. Anisotropic materials were used, and the effects of simulated tensile stress on MFL were investigated. The axial and radial MFL signals depended on far and near-side single pit depth and on the bulk stress, but the circumferential MFL signal did not depend on them. The axial and radial MFL signals increased with increasing pit depth and the bulk stress, but the circumferential MFL signal was scarcely changed.