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HAZ 연화부를 가진 TMCP형 고장력강판의 압축최종강도에 관한 연구 - 제 2 보
백점기,고재용 대한용접접합학회 1991 대한용접·접합학회지 Vol.9 No.2
The use of high tensile steel plates is increasing in the fabrication of ship and offshore structures. The softening region which has lower yield stress than base metal is located to prevent cracking in the conventional high tensile steel. Also, thermo mechanical control process(TMCP) steel with low carbon equivalent has the softening region which occurs in the heat affected zone when high heat input weld is carried out. The softening region in the high tensile steel gives rise to serious effect on structural strength such as tensile strength, fatigue strength and ultimate strength. In order to make a reliable structural design using high tensile steel plates, the influence of the softening on plate strength should be evaluated in advance. In the previous paper, the authors discussed the ultimate compressive strength of 50HT steel square plates with softening region. In this paper, the ultimate compressive strength with varying the yield stress of softening region and the aspect ratio of the plate is investigated by using the elasto-plastic large deformation finite element method.
백점기 한국전산구조공학회 1997 전산구조공학 Vol.10 No.2
본 고에서는 선체구조의 좌굴 및 최종강도에 관한 연구현황을 조사 분석하고자 한다. 먼저 대표적인 구성부재인 판 및 보강판의 좌굴 최종강도에 관한 연구현황을 분석하고, 다음으로 선각거더의 최종붕괴강도에 관한 연구동향을 분석하고자 한다.
Considerations of the Initial Crack Damage Effect on the Advanced Idealized Plate Unit
백점기,서흥원,Paik, Jeom-K.,Suh, Heung-W. The Society of Naval Architects of Korea 1994 大韓造船學會 論文集 Vol.31 No.2
This paper attempts to incorporate the initial crack damage effect into the existing idealized plate unit. For this purpose, a new concept which indicates the equivalent, reduced material properties due to initial cracks at the structural unit level, not at he microscopic aspect, is suggested, and a simplified mechanical plate model for the initially cracked plate in axial tension is formulated as a function of initial crack length, based on the finite-element solutions obtained by crack propagation analysis.
白点基 부산대학교 공과대학 1990 硏究報告 Vol.40 No.-
In order to carry out a reliable design and safety assessment of structures, reliability-based design technique which takes the statistical uncertainty of random variable into account becomes to be of great interest. For ship structures, in particular, an attempt for the standardization of the safety index(level 2) has been performed for the existing ships which are considered to have sufficient structural safety. In this study, a practical approach using MVFOSM method for the ultimate strength-based reliability assessment is formulated for the upper deck structures subjected to uniaxial compression which is induced by the action of sagging moment. Then safety indices for the actual ship structures are evaluated and also the influence of the initial imperfection and material property of the structure on the safety index is investigated.