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이중선체(二重船體) 유조선(油槽船)의 충돌강도해석(衝突强度解析)
백점기,J.K. Paik,P.T. Pedersen 대한조선학회 1995 大韓造船學會 論文集 Vol.32 No.1
본 논문에서는 이상화구조요소법을 적용하여 이중선체 유조선의 충돌손상 해석기법을 개발하고, 모형실험결과와의 비교를 통하여 개발한 해석기법의 정도를 검증한 뒤 4만톤급 컨테이너선의 선수가 이중선체 VLCC의 선측을 충돌할때의 손상거동을 각종설계인자(이중선측폭, 선측 부재치수등)를 변화시켜 가면서 시리즈해석을 수행하여 그 특성을 분석하였다. 본 해석법은 항복, 압괴(crushing), 파단(rupture), 국부 및 전체파손의 상관효과, 변형속도(strain-rate) 영향, gap/contact조건등을 고려하고 있으며, 소요계산시간이 유한요소법에 비해 극히 짧고 해석정도도 높으므로 실제선박의 충돌문제에 대한 구조설계 및 안전성 평가시에 유용하게 적용할 수 있는 "설계응용을 겨냥한 충돌해석방법"(design-oriented collision analysis procedure)이라 할 수 있다. A design-oriented method for analysis of the structural damage due to ship collisions is developed by using the idealized structural unit method(ISUM). The method takes into account yielding, crushing, rupture, the coupling effects between local and global failure of the structure, the influence of strain-rate sensitivity and the gap/contact conditions. The method is verified by a comparison of experimetal and numerical results obtained from test models of double-skin plated structures in collision/grounding situations with the present solutions. As an illustrative example, the method has been used for analyses of a side collision of a double-hull tanker. Several factors affecting ship collision response. namely the collision speed and the scantlings/arrangements of strength members, are discussed.
자동차용 고장력강 박판재의 동적/충격 인장강도에 관한 연구
백점기(J.K.Paik),정장영(J.Y.Chung),백영민(Y.M.Paik) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
Recently. the use of very thin high tensile steels as structural member materials of automobiles has been increased. Also. it is well expected that high speed automobiles are likely subject to dynamic and impact loading. It is known that the strength characteristics of structural members under dynamic/impact loading is quite different from that under static or quasi-static loading. It is therefore very important to clarify strength characteristics of thin high tensile steels under dynamic/impact loading quantitatively and qualitatively so that the structural design of automobiles using such materials could' be efficiently undertaken. This paper, carries out a series of tensile tests on thin high tensile steel materials in dynamic/impact loading condition varying the loading speed. Based on the test results. the dynamic/impact characteristics of thin high tensile steels as use of structural materials of automobiles are investigated. The application of the existing formulations for evaluating the dynamic effects is discussed. The experimental data obtained are documented for future use.