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허영호(Yinghu Xu),이국희(Kuk-Hee Lee),전준영(Jun-Young Jeon),김윤재(Yun-Jae Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Approximate plastic limit load solutions for piping branch junctions under out-of-plane bending are obtained from detailed three-dimensional (3-D) FE limit analyses based on elastic-perfectly plastic materials with the small geometry change option. Two types of bending are considered; out-of-plane bending to the branch pipe and out-of-plane bending to the run pipe. Accordingly closed-form approximations are proposed for piping branch junctions under out-of-plane bending based on the FE results. The proposed solutions are valid for the branch-to-run pipe radius and thickness from 0.0 to 1.0, and the mean radius-to-thickness ratio of the run pipe from 2.0 to 20.0. And, this study provides effects of reinforcement area on plastic limit loads.
자동차 경량화를 위한 텐션 링크의 최적 형상에 관한 연구
명만식(Man-Sik Myung),허영호(Yinghu Xu),최병익(byung-Ik Choi),이학주(Hak-Joo Lee),김주성(Joo-Sung Kim),김기주(Kee-Joo Kim),김윤재(Yun-Jae Kim),박준협(Jun-Hyub Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Due to the global environment problems and the consumer's need for higher fuel efficiency, it becomes very important for the global automotive industry to reduce the vehicle weight. The link component of chassis is applied by 6-DOFs (degree offreedom) loads and should withstand the loads for life cycle. The existed I-beam type link component may have a weak point for a special direction load. In present study, it was innovatively investigated to the optimal shape of link component that could withstand all directions loads and reduce the weight. The 3 type shapes were analyzed and the best optimized shape was found. The optimized design can reduce the weight by 40% of original link that made with steel. The environment and energy related problem has become one of the most important global issues in recent years. Accordingly there have been significant efforts on improving the fuel efficiency of automobiles. One of the most effective ways of improving the fuel efficiency of automobiles is the weight reduction. For example, a new generation six-passenger car is currently under development in the advanced countries and the targeted fuel efficiency is more than three times of the current level.