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한병기,박봉현(B.K.Han),B.H.Park 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this paper, the thick-walled rectangular tubes are analyzed to evaluate the bent-buckling loads by semi-theoretical approach. The effect of material nonlinearity is considered for the case of the buckling behavior of the thick-walled tubes. The buckling behavior by bending forces is more complicate than that one by axial compression. The stress distributions at the loading edges are not simple when bending stresses are applied. Therefore, the modification factor is adopted to calculate the maximum bending moments. Analytical and experimental results are compared and close agreement of the results are observed.
한병기,정강,유서열,Han, B.K.,Chung, K.,Yoo, S.Y. 대한기계학회 1991 대한기계학회논문집 Vol.15 No.1
Stiffened plate structure, which is generally used in the various structural design to develope the load carrying capacity, is classified in two groups; one is the plate stiffened with stiffeners, the other is corrugated plate. In the studies on those structures, the studies on the stiffened plates with stiffeners have been much studied with both quantities and qualities according to requirements of the minimum-weight structural design and the development in many industrial fields, especially automobile, ship and aerospace fields, but the studies on the corrugated plates are undeveloped in comparison with the stiffened plates, and also the analytical stiffness on the corrugated plates remains as the imperfect. In the present studies, the analytical method on the stiffness of corrugated plates made by folding is proposed, and the stiffness equation of corrugated plates with some angle is derived and generalized. The purpose of the present study is to contribute to the design of corrugated plates and to determine the optimum aspect ratio for parameters that decide the aspect of corrugated plates. 본 연구에서는 각이 지게 주름잡힌 주름판 구조물(산형, 사다리꼴형, 장방형 주름판)의 강성을 해석 하고, 이 강성식들을 일원화하여 한개의 식으로 표현하여 주고 자 한다. 이론 해석은, 연결부에서의 각도가 변형중에 변하지 않는다는 가정하에, 등가의 직교이방성판의 강성식을 유도하였다. 또한, 이론적으로 얻어진 강성치를 진 동해석에 적용시킴으로서, 직교이방성판으로서의 주름판의 고유진동수를 구하였다. 그리고 이를 진동실험에서 얻은 결과 및 PC용 슈퍼 SAP에서 얻은 수치결과와 비교함으로 서 이론의 신뢰성을 입증하였다.
한병기,이성희,Han, B.K,Lee, S.H 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12
In this study, free vibration analysis of double through-the-width split beam is studied based on the author's earlier work. Each segment which constructs double through-the-width split beam is considered as Timoshenko beam. The effect of coupling between longitudinal and transverse vibration on the natural frequencies of split beams is considered. Data acquisition and modal test of double split beam for clamped-free boundary condition are carried out. Experimental and numerical results obtained by ANSYS were compared with the calculated data by present theory and their comparisons give good agreement with one another. The influences of the size and location of double split, shear deformation, and boundary conditions on the natural frequencies are demonstrated for illustrative purpose. Effects of double split on the dynamic characteristics of beams can be used to detect the size and the location of damages in structures.