scholarly journals On the Ultimate Longitudinal Strength Assessment of Ships' Hull Structure

2006 ◽  
Vol 43 (3) ◽  
pp. 340-350
Keyword(s):  
Strength Assessment ◽  
Hull Structure ◽  
Longitudinal Strength

Ultimate Strength Assessment of Semi-Submersible Platform Under Different Load Conditions

2017 ◽  
Author(s):  
Yangzhe Yu ◽  
Guoqing Feng ◽  
Huilong Ren
Keyword(s):  
Finite Element ◽  
Ultimate Strength ◽  
High Stress ◽  
Initial Imperfection ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Main Bearing ◽  
Strength Assessment ◽  
Hull Structure ◽  
Load Conditions

The nonlinear finite-element method has been widely used in evaluating the ultimate strength of stiffened plates and part of hull girders, considering the effect of boundary conditions, geometrical initial imperfection and welding-induced residual stress in recent years. However, available research on the ultimate strength of large-sized structures, especially of semi-submersible platform is limited. New large-sized semi-submersible platform has been designed with lateral brace structure and square cross-section columns. The investigation of ultimate strength of the whole structure is of paramount importance in assessing the safety and design of such large structure. Therefore, in this paper, a three-dimensional nonlinear finite element model was developed to investigate the ultimate strength of a new generation of semi-submersible platform under different load conditions and its behavior after collapse using explicit dynamic solvers. Results showed that the time dependent dynamic explicit method was reliable and feasible for the calculation of ultimate strength of such complicated structure. For the target platform, the bracings and upper hull structure were the main bearing component and were critical for the ultimate strength of the whole structure. High stress occurred in connection areas and special attention shall be paid for.

Effect of Marine Nuclear Reactor Environment to Ship’s Structural Responses

2021 ◽  
Author(s):  
Han Koo Jeong ◽  
Soo Hyoung Kim
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Neutron Irradiation ◽  
Ship Hull ◽  
Propulsion System ◽  
Reactor Operation ◽  
Gas Emissions ◽  
Strength Assessment ◽  
Hull Structure ◽  
Structural Behaviors

Abstract As the regulations on greenhouse gas emissions at sea become strict, technology development to minimize environmental pollutants emitted from the propulsion system of ships is actively underway. Research on the use of renewable energy as a power source of ships propulsion system pursuing eco-friendliness is continuously carried out. However, considering the recent development of ships’ large-scale, and at the same time minimizing greenhouse gas emissions at sea, the interest in nuclear energy as the means of a stable supply of environmentally friendly large-capacity energy has been increased. In this study, the effect of marine reactor operation on the material properties of a ship hull material is reviewed, and from this, hull structural behaviors are investigated. Attention is paid to the neutron irradiation on the material in the reactor operation environment, and then the strength assessment of a hull structural member assumed in the neutron irradiation situation is performed. Considering the neutron irradiation effects, the Young’s modulus, poisson’s ratio and allowable stress of DH36, typical high tensile strength steel used in ship hull, are varied based on the research findings related with the topic of neutron irradiated steels. Rectangular stiffened plated structures, basic common structural members for ship hull, are exemplified for the strength assessment to understand their structural behaviors such as strength and stiffness. Results from this study provide information on the effect of neutron irradiation on the hull structural behaviors of the ship using nuclear power and possibly can supplement the hull structure part from classification societies’ rules and regulations.

The Fatigue Strength Assessment for Hull Structure of Steel Fishing Vessel

2012 ◽  
Vol 189 ◽  
pp. 334-339
Author(s):  
Gao Sheng Yang ◽  
Yong He Xie
Keyword(s):  
Fatigue Strength ◽  
Fishing Vessel ◽  
Strength Assessment ◽  
Computing Platform ◽  
Hull Structure ◽  
Fatigue Strength Assessment ◽  
Classification Society

According to the norms “the fatigue strength assessment for hull structures in 2007” issued by China Classification Society, the combined computing platform established is composed of mature hydrodynamic software SESAM from Det NorskeVeritas(DNV)and MSC.PATRAN/NASTRAN, the fatigue strength assessment for hull structure of a steel fishing vessel is studied.

scholarly journals Collapse Strength of Intact Ship Structures

2021 ◽  
Vol 9 (10) ◽  
pp. 1079
Author(s):  
Mesut Tekgoz ◽  
Yordan Garbatov
Keyword(s):  
Ultimate Strength ◽  
Structural Design ◽  
Structural Failure ◽  
Box Girders ◽  
Ship Structures ◽  
Strength Assessment ◽  
Stiffened Panels ◽  
Structural Capacity ◽  
Longitudinal Strength ◽  
Future Work

Ship structures are subjected to complex sea loading conditions, leading to a sophisticated structural design to withstand and avoid structural failure. Structural capacity assessment, particularly of the longitudinal strength, is crucial to ensure the safety of ships, crews, the marine environment, and the cargoes carried. This work aims to overview the ultimate strength assessment of intact ship structures in recent decades. Particular attention is paid to the ultimate strength of plates, stiffened panels, box girders, and entire ship hull structures. A discussion about numerical and experimental analyses is also provided. Finally, some conclusions and suggestions about potential future work are noted.

Slamming Strength Assessment Analysis of Large Container Ship

2014 ◽  
Vol 602-605 ◽  
pp. 379-384
Author(s):  
Chun Hui Wang ◽  
Feng Lei Han ◽  
An Kang Hu ◽  
Ya Chong Liu
Keyword(s):  
Extreme Values ◽  
Finite Model ◽  
Three Dimension ◽  
Strength Assessment ◽  
Local Strength ◽  
Calculation Results ◽  
Longitudinal Strength ◽  
Bow Flare ◽  
Large Container ◽  
Design Pressure

The analysis of slamming effect has been mainly discussed about the local strength assessment and the global longitudinal strength assessment under slamming loads. The former is to forecast the local design pressure and access the local structural strength. To achieve the strength assessment of local structure of the ship bow, the slamming design pressure results of bow bottom and bow flare areas have been selected, so as to show the calculation results of relative velocity extreme values and design slamming pressure. And then according to the slamming loads and strength assessment, the direct strength assessments have been used to check key areas. The latter is to forecast the global vertical design moment and access the global longitudinal strength through three dimension finite model.

Analysis of plated-hull structure strength against hydrostatic and hydrodynamic loads: A case study of 600 TEU container ships

2021 ◽  
Vol 30 (1) ◽  
pp. 237-248
Author(s):  
Muhammad Sabiqulkhair Akbar ◽  
Aditya Rio Prabowo ◽  
Dominicus Danardono Dwi Prija Tjahjana ◽  
Tuswan Tuswan
Keyword(s):  
Plate Thickness ◽  
Structural Response ◽  
Von Mises Stress ◽  
Thickness Variation ◽  
Hydrodynamic Loads ◽  
Strength Assessment ◽  
Deformation Strain ◽  
Ship Hulls ◽  
Hull Structure ◽  
Von Mises

Abstract The assessment of a ship's ability to withstand environmental loads is very crucial. This research focuses on the strength assessment of 600 TEU container ship hulls against hydrostatic and hydrodynamic loads using finite element-based software. Parameter changes in the material types, hull thickness, and ship drafts were performed to compare the structural responses using deformation, strain, and von Mises stress criteria. All of the materials tested were acceptable, where the ASTM A131 Grade AH36 and ASTM A131 Grade AH32 materials have the lowest deformation values and strains. The simulation results regarding plate thickness variation, deformation, strain, and von Mises stress values were smaller as the thickness of the ship structure increased. Moreover, from the draft variation, the structural response due to environmental load was better as the draft of the ship increased.

Hull Structural Analysis of Turret-Moored FPSOs Considering Hull–Turret Interaction

2014 ◽  
Author(s):  
Ki-Myung Lee ◽  
Won-Hyuk Choi ◽  
Hyun Soo Kim ◽  
Seung Han Moon ◽  
Jin Tae Kim
Keyword(s):  
Structural Analysis ◽  
Adaptive Design ◽  
Design Procedure ◽  
Contact Problems ◽  
Direct Analysis ◽  
Offshore Structures ◽  
Linear Superposition ◽  
Strength Assessment ◽  
Hull Structure ◽  
Set Up

For turret-moored ship-type offshore structures such as floating production storage and offloading (FPSO) units, the hull structure is affected by mooring and riser loads that are transferred through turret systems, in addition to environmental loads on the hull itself. Moreover, the existence of turret structures has an influence on the structural behavior of the hull around the turret system. In the structural design of FPSOs, the turret structure and its loads are considered in a direct analysis of hull structure for a realistic strength assessment of FPSOs. This paper investigates several specific techniques for hull structural analysis considering the interaction with the turret system. The linear gap function is utilized to represent the nonlinear contact behavior between the hull and turret structures. The linear superposition of structural responses is also adapted, and its validity is demonstrated in the case of hull–turret contact problems. These studies conclude that the hull structures with turret systems that involve contact nonlinearity in their interface can be assessed using the conventional hull strength assessment based on linear analysis. Moreover, by including the turret model directly in hull structural analysis, the uncertainty arising from hull–turret interface loads can be reduced, and a robust and adaptive design procedure can be set up in the detailed engineering stages.

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