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RISS 인기검색어
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- 저자 : 이탁기(Takkee Lee) (검색결과 2 건)
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이탁기(Takkee Lee),한승호(Seungho Han),임채환(Chaewhan Rim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
For the rational design of welded joint, it is needed to assess repeatedly the fatigue life of the joint with various dimensions and welding conditions. In this paper, an automation of repeated process of fatigue life assessment for welded cruciform joint was studied. The process is related to stress analysis in vicinity of weld-toe and fatigue life assessment based on analyzed stress distribution. With the change of design condition including dimensions and/or welding heat input, the above two works have to be performed. Using the commercial tool for system integration, ModelCenter, an automation of the repeated process for welded cruciform joint based on 2D modeling was achieved. In this automation system, data exchanges between programs regardless of commercial or in-house one work well, and parametric studies for optimal design can be performed.
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충돌 손상된 선체구조의 최종 종강도에 관한 실험적 연구
이탁기(TAKKEE LEE),임채환(CHAE WHAN RIM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.2
Ships in bad weather conditions are likely to be subjected to accidental loads, such as high bending moment, collision, and grounding. Once she has damage to her hull, her ultimate strength will be reduced. This paper discusses an investigation of the effect of collision damage an the ultimate strength of a ship structure by performing a series of collapse tests. For the experiment, five box-girder nwdels with stiffeners were prepared with a cross section at 720㎜ x 720㎜ and a length of 90O㎜. Of the five, one had no damage and four had an ellipse shaped damage area that represented the shape of the bulbous bow of a colliding ship. The amount at damage size was different between models. Among the damaged nwdels, the damage in three at them was made by cutting the plate and stiffener, and in one by pressing to represent collision damage. Experiments were carried out under a pure bending load and the applied load and displacements were recorded. The ultimate strength was reduced as the damage size increased, as expected. The one with the largest amount at damage had damage to 30% of the depth, and its ultimate strength was reduced by 19% compared to the undamaged one. The pressed one has higher ultimate strength than those that were cut. This might be due to the fact that the plate around the pressed damage area contributes to the ultimate strength, whereas the cut one has no plate to contribute.
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