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Recent Developments in Fatigue Assessment of Ships and Offshore Structures

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Journal of Marine Science and Application 2022年第4期21卷 3-25页

作者： yan Dong y.garbatov C.Guedes Soares yantai Research Institute of Harbin Engineering University Harbin Engineering UniversityYantaiChina College of Shipbuilding Engineering Harbin Engineering UniversityHarbinChina Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal HEU-UL International Joint Laboratory of Naval Architecture and Offshore Technology HarbinChina

A review is provided of various approaches that have been adopted recently to assess the fatigue of ships and offshore *** relevant fatigue loading is reviewed first,focusing on the successive loading and unloading of the cargo and the transient *** factors influencing fatigue strength are discussed,including the geometrical parameters,material,residual stress,and ones related to the *** approaches for fatigue analyses of seam-welded joints are covered,i.e.,the structural stress or strain approach,the notch stress or strain approach,notch intensity approach,and the crack propagation approach.

关键词： Ships and offshore structures Fatigue loading Influencing factors Fatigue analysis approaches

Review of Ultimate Strength Assessment of Ageing and Damaged Ship Structures

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Journal of Marine Science and Application 2020年第4期19卷 512-533页

作者： M.Tekgoz y.garbatov C.Guedes Soares Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaAv.Rovisco Pais1049-001 LisbonPortugal

The objective of this work is to provide an overview of the ultimate strength assessment of ageing and damaged ship structures in the last *** attention is paid to the ultimate strength of plates,stiffened panels,box girders,and entire ship hull structures subjected to corrosion degradation,fatigue cracking,and mechanical damage caused by accidental loading or impact.A discussion on the effect of the cyclic load on the plate rigidity,re-yielding,and ultimate load capacity on the ship hull girder is also part of the present ***,some conclusions and discussions about potential future work are provided,identifying that more studies about the impact of corrosion degradation on the structural behaviour of the stiffened panels and the overall hull girders are *** related to the dynamic collapse behaviour of corroded and damaged ship structures under time-variant load also requires additional attention.

关键词： Marine corrosion Damage Ultimate strength Finite element method

Review on Artificial Intelligence-aided Life Extension Assessment of Offshore Wind Support Structures

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Journal of Marine Science and Application 2022年第4期21卷 26-54页

作者： B.yeter y.garbatov C.Guedes Soares Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal

The primary objective of the present literature review is to provide a constructive and systematical discussion based on the relevant development,unsolved issues,gaps,and misconceptions in the literature regarding the fields of study that are building blocks of artificial intelligence-aided life extension assessment for offshore wind turbine support *** present review aims to set up the needed guidelines to develop a multi-disciplinary framework for life extension management and certification of the support structures for offshore wind turbines using artificial *** main focus of the literature review centres around the intelligent risk-based life extension management of offshore wind turbine support *** this regard,big data analytics,advanced signal processing techniques,supervised and unsupervised machine learning methods are discussed within the structural health monitoring and condition-based maintenance planning,the development of digital ***,the present review discusses the critical failure mechanisms affecting the structural condition,such as high-cycle fatigue,low-cycle fatigue,fracture,ultimate strength,and corrosion,considering deterministic and probabilistic approaches.

关键词： Offshore wind Life extension Artificial intelligence Fatigue Structural integrity Corrosion-related cracking Risk-based maintenance

Numerical Analysis of Stress Concentration in Non-uniformly Corroded Small-Scale Specimens

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Journal of Marine Science and Application 2021年第1期20卷 1-9页

作者： J.Kodvanj y.garbatov C.Guedes Soares J.Parunov Faculty of Mechanical Engineering and Naval Architecture University of ZagrebZagrebCroatia Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaAv.Rovisco Pais1049-001 LisbonPortugal

A numerical evaluation of stress concentrations of corroded plate surfaces of small-scale corroded steel specimens is compared with the experimentally estimated *** specimens were cut from a steel box girder,which was initially corroded in real seawater *** surface of all corroded specimens was analysed applying photogrammetry techniques,and a statistical description of an idealised corroded surface of each specimen was *** lives of specimens are determined from the fatigue *** on experimentally obtained fatigue lives,the stress concentration factors are calculated concerning the ideally smooth *** correlation between the statistical parameters of the corroded specimen surfaces and the estimated stress concentration factors is *** corroded surfaces,converted in graphical format,are then used for the finite element modelling in ABAQUS software,and stress concentration factors are estimated from the finite element results.A convergence study is performed to determine the appropriate finite element mesh *** between experimentally obtained and numerically estimated stress concentration factors is performed as well as correlation analysis between actual and finite element predicted crack locations.

关键词： Fatigue life Fatigue tests Corrosion Stress concentration factors Finite element method

Fatigue Reliability of Deck Structures Subjected to Correlated Crack Growth

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Journal of Marine Science and Application 2013年第4期12卷 413-421页

作者： G.Q.Feng y.garbatov C.Guedes Soares Centre for Marine Technology and Engineering (CENTEC) Instituto Superior Técnico University of LisbonAv. Rovisco Pais

The objective of this work is to analyse fatigue reliability of deck structures subjected to correlated crack *** stress intensity factors of the correlated cracks are obtained by finite element analysis and based on which the geometry correction functions are *** Monte Carlo simulations are applied to predict the statistical descriptors of correlated cracks based on the Paris-Erdogan equation.A probabilistic model of crack growth as a function of time is used to analyse the fatigue reliability of deck structures accounting for the crack propagation correlation.A deck structure is modelled as a series system of stiffened panels,where a stiffened panel is regarded as a parallel system composed of plates and are *** has been proven that the method developed here can be conveniently applied to perform the fatigue reliability assessment of structures subjected to correlated crack growth.

关键词： crack growth fatigue reliability deck structures correlation stiffened panel

Study on Ultimate Compressive Strength of Aluminium-Alloy Plates and Stiffened Panels

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Journal of Marine Science and Application 2020年第4期19卷 534-552页

作者： Bin Liu Van Tuyen Doan ygarbatov Weiguo Wu C.Guedes Soares Green&Smart River-Sea-Going Ship Cruise and Yacht Research CentreWuhan University of TechnologyWuhan 430063China Faculty of Shipbuilding Vietnam Maritime UniversityHaiphongVietnam Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de Lisboa1049-001 LisbonPortugal

This work reviews the ultimate compressive strength of aluminium plates and stiffened *** effect of boundary condition,initial imperfection,welding-induced residual stress and heat-affected zone are *** the effect of manufacturing technology lacks in the literature,this effect is analysed employing the finite element method,considering the technology of welding and integrated *** numerical analyses have shown that the ultimate strength of the integrated extruded stiffened panel is relatively higher than the one of the traditional welded panel.

关键词： Ultimate strength Compressive load Stiffened panel Aluminiumalloy Review

Ultimate Strength Assessment of a Tanker Hull Based on Experimentally Developed Master Curves

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Journal of Marine Science and Application 2013年第2期12卷 127-139页

作者： Mingcai Xu y. garbatov C. Guedes Soares Centre for Marine Technology and Engineering (CENTEC) lnstituto Superior TOcnico Technical University of Lisbon Lisbon Portugal

A geometrically similar scaling was made from small-scale specimen to full-scale stiffened panels and then their collapse behaviour is investigated. It is considered that the stiffened panel compressive ultimate strength test was designed according to geometrical scaling laws so that the output of the test could be used as representative of the stiffened panels of the compressive zone of a tanker hull subjected to vertical bending moment. The ultimate strength of a tanker hull is analysed by a FE analysis using the experimentally developed master stress-strain curves which are obtained by the beam tension test and the compressive test of the stiffened panel, and are then compared with the result achieved by the progressive collapse method.

关键词： ship hull tanker hull stiffened panel ultimate strength scaling laws similitude analysis

Reliability Analysis Based on a Direct Ship Hull Strength Assessment

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Journal of Marine Science and Application 2015年第4期14卷 389-398页

作者： Guoqing Feng Dongsheng Wang yordan garbatov C. Guedes Soares School of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China Centre for Marine Technology and Ocean Engineering (CENTEC) Instituto Superior Tecnico Universidade de Lisboa Av. Roviseo Pais 1049-001 Lisboa Portugal

A method of reliability analysis based on a direct strength calculation employing the von Mises stress failure criterion is presented here. The short term strain distributions of ship hull structural components are identified through the statistical analysis of the wave-induced strain history and the long term distributions by the weighted summation of the short term strain distributions. The wave-induced long term strain distribution is combined with the still water strain. The extreme strain distribution of the response strain is obtained by statistical analysis of the combined strains. The limit state function of the reliability analysis is based on the von Mises stress failure criterion, including the related uncertainties due to the quality of the material and model uncertainty. The reliability index is calculated using FORM and sensitivity analysis of each variable that has effects on the reliability is also discussed.

关键词： ship hull yield stress ship structures reliability analysis direct calculation yon Mists stress failure criterion