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A useful guide of effective mesh-size decision in predicting the ultimate strength of flat-and curved plates in compression

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Journal of Ocean Engineering and Science 2023年第4期8卷 401-417页

作者： Do Kyun Kim Imjun Ban Bee Yee Poh Sung-Chul Shin Department of Naval Architecture and Ocean Engineering College of EngineeringSeoul National UniversitySeoulSouth Korea Research Institute of Marine Systems Engineering Seoul National UniversitySeoulKorea Group of Marine Offshore and Subsea Technology(MOST)School of EngineeringNewcastle UniversityNewcastle upon TyneUK Department of Naval Architecture and Ocean Engineering Pusan National UniversityBusanSouth Korea Ocean and Ship Technology Research Group Department of Civil and Environmental EngineeringPETRONAS University of TechnologySeri IskandarPerakMalaysia

The present study aims to determine the appropriate size of mesh or the number of the element(NoE)for flat-and curved plates,which is suggested to assess its safety subjected to axial compression based on the ultimate limit state(ULS)design and analysis *** unstiffened panel(=plate)and stiff-ened panel,considered primary members of ships and ship-shaped offshore structures,are subjected to repeated axial compression and tension caused by continued vertical bending moments applied to the hull *** are attached with stiffeners by welding,and 6,8 or 10 elements are generally rec-ommended to allocate in flat-plate’s breadth direction in between stiffeners for finite-element(FE)mod-elling,which enables the presentation of the shape of initial deflection applied to the *** the case of the load-shorting curve for curved plate,it is reported that the nonlinear behaviour characteristics,i.e.,snap-through,snap-back,secondary buckling and others,appear in typical flank *** take this into account,we investigated the preferred number of elements(6,8 or 10)generally applied to the flat plate whether it is an appropriate or more fine-sized element(or mesh)that should be considered.A useful guide is documented based on obtained outcomes which may help structural engineers select optimised mesh-size to predict ultimate strength and understand its characteristic of the flat and curved plates.

关键词： ultimate strength Unstiffened panel Longitudinal compression Mesh convergence Finite-element method

ultimate strength OF POSTBUCKLING FORSIMPLY SUPPORTED RECTANGULAR COMPOSITE THIN PLATES UNDER COMPRESSION

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Applied Mathematics and Mechanics(English Edition) 1998年第4期19卷 391-397页

作者：周祝林 Shanghai FRP Research Institute Shanghai P. R. China

It is proved that the ultimate strength of postbuckling for simply supported rectangular composite thin plates under compression is far higher than their buckling stress through the tests of 283 rectangular composite thin laminates in this paper. The ultimate strength of the composite thin plates is studied using large-deflection theory and small-deflection theory of thin plates. According to the failure criterion of the composites ultimate strength is found finally. It is in accordance with the experimental values for the plates having 45 degrees off-axial, and for longitudinal and latitudinal plates, when beta < 0.11, the theoretical values are higher. The coefficient C given in this paper may be referred to in product designing.

关键词： compression failure criterion composites postbuckling ultimate strength

A Simple Empirical Formula for Predicting the ultimate strength of Ship Plates with Elastically Restrained Edges in Axial Compression

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China Ocean Engineering 2020年第4期34卷 571-580页

作者： LIU Cong ZHANG Shi-lian State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China

An investigation is conducted on the static ultimate limit state assessment of ship hull plates with elastically restrained edges subjected to axial *** material and geometric non-linearities were considered in finite element(FE)*** initial geometric imperfection of the plate was considered,while the residual stress introduced by welding was not *** ultimate strength of simply supported ship hull plates compared well with the existing empirical formula to validate the correctness of the applied boundary conditions,initial imperfection and mesh *** extensive FE calculations on the ultimate strength of ship hull plates with elastically restrained edges are *** a new simple empirical formula for plate ultimate strength is developed,which includes the effect of the rotational restraint stiffness,rotational restraint stiffness,and aspect *** applying the new formula and FE method to ship hull plates in real ships,a good coincidence of the results between these two methods is obtained,which indicates that the new formula can accurately predict the ultimate strength of ship hull plates with elastically restrained edges.

关键词： ship hull plate ultimate strength axial compression elastically restrained edges empirical formula

A Computational Investigation of the Group Effect of Pits on the ultimate strength of Steel Plates

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China Ocean Engineering 2018年第6期32卷 665-674页

作者： FU Qiang FANG Hui WU Ren-xia YU Xue-hui LI Hua-jun Institute of Coastal and Offshore Engineering School of Engineering Ocean University of China State Key Laboratory for strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong University

In this work, we focus on assessing the group effect of localized corrosion on the ultimate strength of the marine structural plates and study the load-deformation behaviors of plates of various slenderness and uniaxial ***, we investigate different corroded patterns from a single circular pit to 25 circular pits distributed over the plate and carry out hundreds of nonlinear finite element simulations by combining the number, depth, distribution of pits with imperfections and slenderness of plate. The distribution of multiple pits causes scattering of stress concentration on the plate, then the plastic section of plate changes with wider distribution of damage simultaneously. The ultimate strength arises when un-loading zone comprised of the yielding strips and holes extends across the plate. It can be concluded that the corroded condition defined as group effect of pits manipulates the deformation state and the loading capacity of plate at the ultimate strength mode that coincides with the proportion of effective loading area and section in the process of post-buckling. To validate the effect of pits group, we perform the numerical experiments of the post-buckling of steel plates containing pits in a row with different orientation.

关键词： group effect localized corrosion post-buckling ultimate strength

Reliability of the ultimate strength of Ship Stiffened Panel Subjected to Random Corrosion Degradation

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China Ocean Engineering 2017年第1期31卷 11-18页

作者： FENG Guo-qing HU Bing-nan REN Hui-long College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China

Attentions have been increasingly paid to the influence of the corrosion on the ultimate strength of ship structures. In consideration of the random characteristics of the corrosion of ship structures, the method for the ultimate strength analysis of the ship stiffened panel structure subjected to random corrosion degradation is presented. According to the measured corrosion data of the bulk carriers, the distribution characteristics of the corrosion data for the stiffened panel on the midship deck are analyzed, and a random corrosion model is established. The ultimate strength of the corroded stiffened panel is calculated by lhe nonlinear finite element analysis. The statistical descriptions of the ultimate strength of the corroded stiffened panel are defined through the Monte Carlo simulations. A formula is proposed on the ultimate strength reduction of the stiffened panel as a function of the corrosion volume. The reliability analysis of the ultimate strength of the corroded deck stiffened panel is performed. It shows that both the corrosion data of the deck stiffened panel and the ultimate strength of the random corroded deck stiffened panel follow the log-normal distribution. The ultimate stress ratio of the stiffened panel is inversely proportional to the corrosion volume ratio.

关键词： stiffened panel corrosion ultimate strength time variant reliability corrosion volume /:~no- ~T (~ ~11 R NI R^n l-I I. 9017 Rollnhilltvnftho.ltlmnto ~trontrth nf^hl

Effect of Strain Rate on ultimate strength and Fractograph in Tungsten Alloy

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Rare Metals 1998年第3期17卷 39-43页

作者：唐长国朱金华周惠久东华大学材料科学与工程系上海西安交通大学陕西西安

The effect of strain rate on ultimate strength and fractograph was investigated for tungsten alloy with four different technologies. As the strain rate rises, the ultimate strength increases and morphology of fracture surface gradually transits from detachment of interface between W pellets and matrices to cleavage of W pellets. Meanwhile, low strength tungsten alloy has higher sensitivity to strain rate.

关键词： Strain rate Tungsten alloy ultimate strength Fractograph

A Simplified Model for the Effect of Weld-Induced Residual Stresses on the Axial ultimate strength of Stiffened Plates

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Journal of Marine Science and Application 2018年第1期17卷 57-67页

作者： Bai-Qiao Chen C.Guedes Soares Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TecnicoUniversidade de Lisboa1049-001 LisbonPortugal

The present work investigates the compressive axial ultimate strength of fillet-welded steel-plated ship structures subjected to uniaxial compression,in which the residual stresses in the welded plates are calculated by a thermo-elasto-plastic finite element analysis that is used to fit an idealized model of residual stress *** numerical results of ultimate strength based on the simplified model of residual stress show good agreement with those of various methods including the International Association of Classification Societies(IACS)Common Structural Rules(CSR),leading to the conclusion that the simplified model can be effectively used to represent the distribution of residual stresses in steel-plated structures in a wide range of engineering *** is concluded that the widths of the tension zones in the welded plates have a quasi-linear behavior with respect to the plate *** effect of residual stress on the axial strength of the stiffened plate is analyzed and discussed.

关键词： Fillet weld Finite element analysis Residual stress ultimate strength

ultimate strength Analysis of Offshore Jacket Platform

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China Ocean Engineering 1995年第3期10卷 263-274页

作者： Xu Bin Shen Zhonghan Research Associate, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 . Associate Professor, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080

The ultimate strength analysis of offshore jacket platforms is a research project which has been developed in recent years. With the rapid development of marine oil industry, the departments of design and IMR (Inspection, Maintenance and Repair) in the offshore engineering have attached great importance to this project. The research procedure applies to both the stress check of new design platforms and the whole safety assessment of existing platforms. In this paper, we combine the pseudo non-linear technique with the linear analysis program and successfully analyze the ultimate strength of the space frame structure subject to the concentrated load and a real jacket platform subject to the dead load and environmental load.

关键词： offshore platform ultimate strength linear analysis pseudo non-linear platform collapse

ultimate Compressive strength Prediction for Stiffened Panels by Counterpropagation Neural Networks(CPN)

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China Ocean Engineering 1999年第3期14卷 335-342页

作者：魏东张圣坤 School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University Shanghai 200030 China

Stiffened Panels are important strength members in ship and offshore structures. A new method based on counterpropagation neural networks (CPN) is proposed in this paper to predict the ultimate compressive strength of stiffened panels. Compared with two-parametric polynomial, this method can take more parameters into account and make more use of experimental data. Numerical study is carried out to verify the validation of this method. The new method may find wide application in practical design.

关键词： stiffened panels ultimate strength counterpropagation neural networks