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김유일,박성건,강중규 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
Unlike high speed slender container carrier, the springing response of low speed blunt ship is known to be influenced by the nonlinear excitation of the incoming wave. The main driving force is second order diffraction force which is induced by the interaction between incoming wave and blunt bow of the ship leading the wave pile-up and reflection. Currently available numerical codes are not able to handle this nonlinear phenomenon so that experimental approach was taken in this study. The partitioned hull with given stiffness of 400K ore carrier was tested in model basin to see the effect of the hydroelasticity on the fatigue damage of the ship. It turned out that the influence of the hull flexibility on the fatigue strength of the ship was more than expected and the effect depends on the sea state the ship is exposed to.
A Study of Hull Stress Monitoring System Considering Thermal Effect
심천식,허주호,강중규 한국항해항만학회 2008 한국항해항만학회지 Vol.32 No.2
This paper presents hull stress monitoring system installed in LNGC damaged by a Typhoon. Elongation/contraction of removed areas has been assessed in terms of possible residual stress that will take place in replaced blocks when the applied load is removed. The bending moment of a vessel changes actually in terms of loss of longitudinal members and the change of weight distribution in repair procedure. The change of bending moment affects mainly in hull stress of longitudinal members. Hull stress monitoring system was installed on upper deck to prove LNGC stable in the criteria to be less than 40MPa during the period of repair procedure. A temperature measuring system was also installed to exclude the additional stress due to thermal effect from the measured hull stress. As a result, the hull stress was modified with the data measured by the temperature measuring system. This hull stress considering thermal effect was used as a guide stress to check the safety of LNGC during the period of repair procedure. This paper presents hull stress monitoring system installed in LNGC damaged by a Typhoon. Elongation/contraction of removed areas has been assessed in terms of possible residual stress that will take place in replaced blocks when the applied load is removed. The bending moment of a vessel changes actually in terms of loss of longitudinal members and the change of weight distribution in repair procedure. The change of bending moment affects mainly in hull stress of longitudinal members. Hull stress monitoring system was installed on upper deck to prove LNGC stable in the criteria to be less than 40MPa during the period of repair procedure. A temperature measuring system was also installed to exclude the additional stress due to thermal effect from the measured hull stress. As a result, the hull stress was modified with the data measured by the temperature measuring system. This hull stress considering thermal effect was used as a guide stress to check the safety of LNGC during the period of repair procedure.
김유일,전유철,강중규,한종만,한민구 대한용접접합학회 2000 대한용접·접합학회지 Vol.18 No.5
Fatigue crack propagation life of weld toe crack through residual stress field was estimated with Elber's crack concept. Propagation of weld toe crack is heavily influenced by residual stress caused by welding process, so it is essential to take into account the effect of residual stress on the propagation life of weld toe crack. Fatigue crack at transverse and longitudinal weld toe was studied respectively, which represent typical weld joint in ship structure. Numerical and experimental studies are performed for both cases. Residual stress near weldment was estimated through nonlinear thermo-elasto-plastic finite element method, and residual stress intensity factor with Glinka's weight function method. Effective stress intensity factor was calculated with Newman-Forman-de Koning-Henriksen equation which is based on Dugdale strip yield model in estimating crack closure level U at different stress ratio. Calculated crack propagation life coincided well with experimental results.
홍태민,윤광희,강중규,이희근 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.11
대형 선박 및 해양플랜트 구조물의 탑재 조립 단계에서 발생하는 수직 맞대기 이음부 용접에는 고능률 1패스 용접이 가능한 EGW (Electro Gas Welding) 기법이 보편적으로 적용되어왔다. 현재 적용되고 있는 EGW 장치는 사전에 용접선을 따라 철판에 여러 개의 레일을 부착하고 무거운 용접주행장치를 곤도라 위에서 레일에 체결하여 사용하기 때문에 항상 설치 및 해체 작업이 필요하고 고소 작업 중 안전 문제가 발생하여 무레일 EGW 용접 장치 개발이 요구되었다. 본 연구는 수직 맞대기 용접부를 1패스 용접이 가능한 무레일 EGW 장치를 연구 개발하여 실제 생산에 적용 가능한 기술개발을 목적으로 하였으며, 직선부의 용접뿐 만 아니라 선박의 선수 선미 의 곡선부 용접까지 가능한 기술 개발을 목적으로 하였다.