Marine accidents have caused immense casualties on various parties in shipping and shipbuilding industries, including financial and structural losses. This situation makes ship accident becomes a critical subject in n...Marine accidents have caused immense casualties on various parties in shipping and shipbuilding industries, including financial and structural losses. This situation makes ship accident becomes a critical subject in naval architecture and marine structures, as it needs continuous assessment and investigation to broaden insight and data of collision and grounding phenomena. The paper aims to investigate structural conditions of a ship arranged by double hull system under accidental scenario, namely ship grounding. Fundamental concept of structure-rock interaction in poweredhard grounding is adopted to design impact configuration for calculation using finite element(FE)simulation. Involved entities are defined as the structure represented by tanker vessel, and oceanic rock is deployed as the indenter in analysis. Calculation results indicate that the crashworthiness capability of structural part strengthened by longitudinal girder is higher than other selected locations on the structures against rock penetration. Localized flooding of storage oil may occur during raking damage is formed on structural part between two girders.展开更多
This paper focusses on steel-welded hemispherical shells subjected to external hydrostatic pressure.The experimental and numerical investigations were performed to study their failure behaviour.The model was fabricate...This paper focusses on steel-welded hemispherical shells subjected to external hydrostatic pressure.The experimental and numerical investigations were performed to study their failure behaviour.The model was fabricated from mild steel and made through press forming and welding.We therefore considered the effect of initial shape imperfection,variation of thickness and residual stress obtained from the actual structures.Four hemisphere models designed with R/t from 50 to 130 were tested until failure.Prior to the test,the actual geometric imperfection and shell thickness were carefully measured.The comparisons of available design codes(PD 5500,ABS,DNV-GL)in calculating the collapse pressure were also highlighted against the available published test data on steel-welded hemispheres.Furthermore,the nonlinear FE simulations were also conducted to substantiate the ultimate load capacity and plastic deformation of the models that were tested.Parametric dependence of the level of sphericity,varying thickness and residual welding stresses were also numerically considered in the benchmark studies.The structure behaviour from the experiments was used to verify the numerical analysis.In this work,both collapse pressure and failure mode in the numerical model were consistent with the experimental model.展开更多
文摘Marine accidents have caused immense casualties on various parties in shipping and shipbuilding industries, including financial and structural losses. This situation makes ship accident becomes a critical subject in naval architecture and marine structures, as it needs continuous assessment and investigation to broaden insight and data of collision and grounding phenomena. The paper aims to investigate structural conditions of a ship arranged by double hull system under accidental scenario, namely ship grounding. Fundamental concept of structure-rock interaction in poweredhard grounding is adopted to design impact configuration for calculation using finite element(FE)simulation. Involved entities are defined as the structure represented by tanker vessel, and oceanic rock is deployed as the indenter in analysis. Calculation results indicate that the crashworthiness capability of structural part strengthened by longitudinal girder is higher than other selected locations on the structures against rock penetration. Localized flooding of storage oil may occur during raking damage is formed on structural part between two girders.
基金The corresponding author would like to acknowledge the Research Grant of Pukyong National University(2019).
文摘This paper focusses on steel-welded hemispherical shells subjected to external hydrostatic pressure.The experimental and numerical investigations were performed to study their failure behaviour.The model was fabricated from mild steel and made through press forming and welding.We therefore considered the effect of initial shape imperfection,variation of thickness and residual stress obtained from the actual structures.Four hemisphere models designed with R/t from 50 to 130 were tested until failure.Prior to the test,the actual geometric imperfection and shell thickness were carefully measured.The comparisons of available design codes(PD 5500,ABS,DNV-GL)in calculating the collapse pressure were also highlighted against the available published test data on steel-welded hemispheres.Furthermore,the nonlinear FE simulations were also conducted to substantiate the ultimate load capacity and plastic deformation of the models that were tested.Parametric dependence of the level of sphericity,varying thickness and residual welding stresses were also numerically considered in the benchmark studies.The structure behaviour from the experiments was used to verify the numerical analysis.In this work,both collapse pressure and failure mode in the numerical model were consistent with the experimental model.
