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Ultimate Strength Assessment of Steel-Welded Hemispheres under External Hydrostatic Pressure

Journal of Marine Science and Application 2020年第4期19卷 615-633页

作者： Sang-Rai Cho Teguh Muttaqie Seung Hyun Lee Jaewoo Paek Jung Min Sohn Ulsan Lab Inc.UlsanSouth Korea School of Naval Architecture and Ocean Engineering University of UlsanUlsanSouth Korea Department of Naval Architecture and Marine Systems Engineering Pukyong National UniversityBusanSouth Korea Agency for the Assessment and Application of Technology Center of Technology for Defense and Security Industries-BPPTJakartaIndonesia Hyundai Mipo Dockyard UlsanSouth Korea Hyundai Heavy Industries UlsanSouth Korea Interdisciplinary Program of Marine Convergence Design Pukyong National UniversityBusanSouth Korea

This paper focusses on steel-welded hemispherical shells subjected to external hydrostatic *** experimental and numerical investigations were performed to study their failure *** model was fabricated from mild steel and made through press forming and *** therefore considered the effect of initial shape imperfection,variation of thickness and residual stress obtained from the actual *** hemisphere models designed with R/t from 50 to 130 were tested until *** to the test,the actual geometric imperfection and shell thickness were carefully *** 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 ***,the nonlinear FE simulations were also conducted to substantiate the ultimate load capacity and plastic deformation of the models that were *** dependence of the level of sphericity,varying thickness and residual welding stresses were also numerically considered in the benchmark *** structure behaviour from the experiments was used to verify the numerical *** this work,both collapse pressure and failure mode in the numerical model were consistent with the experimental model.

关键词： Steel-welded hemisphere Collapse pressure Experiment nonlinear fea Ultimate strength formulation

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