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전단하중의 크기가 모드 Ⅱ 분기균열의 형성과 전파에 미치는 영향
이정무(J. M. Lee),송삼흥(S. H. Song) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In this paper, we investigated the characteristics of initiation and propagation behavior for fatigue crack observed by changing various shapes of initial crack and magnitudes of loading in modified compact tension shear(CTS) specimen subjected to shear loading. In the low-loading condition, the secondary fatigue crack was created in the notch root due to friction on the pre-crack face grew to a main crack. In the high-loading condition, fatigue crack under shear loading propagated branching from the pre-crack tip. Influenced by the shear loading condition, fatigue crack propagation retardation appeared in the initial propagation region due to the reduction of crack driving force and friction on crack face. In both cases, however, fatigue cracks grew in tensile mode type. The propagation path of fatigue crack under the Mode II loading was 70 degree angle from the initial crack regardless of its shape and load magnitude.
김경태(K.T. Kim),나공태(K.T. Ra),이정무(M. Lee),김은수(E.S. Kim),박찬홍(C.H. Park),노현수(H.S. Rho) 한국해양환경·에너지학회 2015 한국해양환경·에너지학회 학술대회논문집 Vol.2015 No.11
독도 주변 해역에서 주상퇴적물 내의 중금속 수직 분포 조사를 위하여 2006년 11∼12월에 2개정점에서 시료를 채취하였다. 퇴적물 내 금속의 최대값은 Al 9.44%, Fe 5.15%, Mn 13,956ppm, Cr 88.1ppm, Co 29.9ppm, Ni 59.1ppm, Cu 51.2ppm, Zn 158ppm, As 27.8ppm, Cd 0.60ppm, Pb47.8ppm, 그리고 Hg 0.10ppm을 나타내었다. Mn, Co, As, Pb과 Hg은 각 주상퇴적물의 상층부(0∼3cm)에서 가장 높은 농도를 나타내었다. 반면 Cu, Zn과 Cd은 상층부로 갈수록 낮아지는 경향을 보였다. The vertical distribution of heavy metals were investigated for the sediment cores(2 sites) in the adjacent sea to the Dokdo in November∼December 2006. The maximum values for Al, Fe, Ma, Cr, Co, Ni, Cu, Zn, As Cd, Pb and Hg of total samples were 9.44%, 5.15%, 13,956ppm, 88.1ppm, 29.9ppm, 59.1ppm, 51.2ppm, 158ppm, 27.8ppm, 0.60ppm, 47.8ppm and 0.10ppm. The maximum values of Mn, Co, As, Pb and Hg were observed at the upper layer(0∼3cm) of each sediment core. However, the profiles of Cu, Zn, Cd showed an decreasing trend toward the upper layer.