Influence of geometric imperfections on the ultimate strength of the double bottom of a Suezmax tanker

Estefen, Segen F.; Chujutalli, John H.; Soares, C. Guedes

doi:10.1016/j.engstruct.2016.08.036

Cited by 32 publications

(8 citation statements)

References 27 publications

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“…(7) Increase the curvature, calculate the increment in strain and stress according to the stress-strain curve, and then the cumulative results of bending moment, strain, and stress of each unit can be obtained; (8) The position of the neutral axis can be calculated with the stress and strain…”

Section: The Improved Smith Methodsmentioning

confidence: 99%

“…The longitudinal-strength assessment method for intact ships can be calculated directly by the Smith method and the Finite Element Method (FEM). There are more studies about the ultimate strength based on these methods [4][5][6][7][8]. However, it is difficult to directly obtain the longitudinal strength of the ship under combined bending moments, and one has to rely on the limit state function for the assessment of ship safety.…”

Section: Introductionmentioning

confidence: 99%

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Methods for Fitting the Limit State Function of the Residual Strength of Damaged Ships

Zhu

Ren

Wang

et al. 2022

JMSE

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The limit state function is important for the assessment of the longitudinal strength of damaged ships under combined bending moments in severe waves. As the limit state function cannot be obtained directly, the common approach is to calculate the results for the residual strength and approximate the limit state function by fitting, for which various methods have been proposed. In this study, four commonly used fitting methods are investigated: namely, the least-squares method, the moving least-squares method, the radial basis function neural network method, and the weighted piecewise fitting method. These fitting methods are adopted to fit the limit state functions of four typically sample distribution models as well as a damaged tanker and damaged bulk carrier. The residual strength of a damaged ship is obtained by an improved Smith method that accounts for the rotation of the neutral axis. Analysis of the results shows the accuracy of the linear least-squares method and nonlinear least-squares method, which are most commonly used by researchers, is relatively poor, while the weighted piecewise fitting method is the better choice for all investigated combined-bending conditions.

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Section: The Improved Smith Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Methods for Fitting the Limit State Function of the Residual Strength of Damaged Ships

Zhu

Ren

Wang

et al. 2022

JMSE

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“…The strategy followed to predict the ultimate strength of FGM plate is adopted from the literature wherein the researchers have utilized nonlinear FEM to determine the ultimate strength of elasticperfectly plastic and bilinear elastic-plastic isotropic homogeneous plates (El-Sawy et al, 2004;Estefen et al, 2016;Ghavami and Khedmati, 2006;Narayanan and Chow, 1984;Paik, 2005;Shanmugam et al, 1999a).…”

Section: Definition Of Ultimate Failure Of Fgmmentioning

confidence: 99%

Elastoplastic Stability and Failure Analysis of FGM Plate with Temperature Dependent Material Properties under Thermomechanical Loading

Sharma

Kumar

2017

Lat. Am. j. solids struct.

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The present paper explores the stability and failure response of elastoplastic Ni/Al2O3 functionally graded plate under thermomechanical load using non-linear finite element formulation based on first-order shear deformation theory and von-Karman's nonlinear kinematics. The temperature dependent thermoelastic material properties of FGM plate are varied in the thickness direction by controlling the volume fraction of the constituent materials (i.e., ceramic and metal) with a power law, and Mori-Tanaka homogenization scheme is applied to evaluate the properties at a particular thickness coordinate of FGM plate. The elastoplastic behavior of FGM plate is assumed to follow J2-plasticity with isotropic hardening, wherein the ceramic phase is considered to be elastic whereas the metal is assumed to be elastic-plastic in accordance with the Tamura-Tomota-Ozawa model. Numerical studies are conducted to examine the effects of material and geometrical parameters, viz. material in-homogeneity, slenderness and aspect ratios on the elastoplastic bucking and postbuckling behavior and the failure response of FGM plate. It is revealed that material gradation affects the stability and failure behavior of FGM plate considerably. Furthermore, it is also concluded that FGM plate with elastic material properties exhibits only stable equilibrium path, whereas the elastoplastic FGM plate shows destabilizing response after the ultimate failure point.

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“…The influence of superstructure on the longitudinal ultimate strength was analyzed by Muis Alie et al [16], the superstructure was include in the model in order to the effect of it. The influence of initial geometric imperfection modes on the ultimate strength of a ship s hull was studied by Estefen et al [17], with a focus on the buckling behavior of stiffened panels that initiates the structural hull failure. The finite element analysis on the ship hull girder under longitudinal bending with bottom damaged was investigated by Muis Alie et al [18], Ultimate torsional strength of cracked stiffened box girders with a large deck opening by Lei Ao and De-Yu Wang [19], Weight reduction and strengthening of marine hatch covers by using composite materials by Basem E. Tawfik et al [20],…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Ultimate Strength with and without Hatch Opening Subjected to Longitudinal Bending

Suci

Alie

Sitepu

2022

Kapal

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The hatch opening has function to enter the load into the cargo hold. One of the ship type like this is Bulk Carrier. The hatch opening must be designed in suitable way because its influence to the ultimate strength since the hull girder under longitudinal bending moment. The application of the hatch opening on the ship’s deck should be considered for the ship design critreria. The objective of the present study is to analyze the ultimate strength with and without hatch opening subjected to longitudinal bending moment. The cross section of box girder is used to analyze the effect of hatch opening to the ultimate strength. This cross section of box girder is adopted for simple calculation. The application of Multiple Point Constrained (MPC) is adopted to analyze the box girder under longitudinal bending moment. The cross section of box girder is assumed remained plane during progressive collapse. The material such as density, yield strength, elastic modulus and poisson ratio are homogeneous. The type and dimensions of the stiffeners are also identic. The only one of the difference for the stiffener is number due to the hatch opening at the top of the box girder. It is found that the ultimate strength of the box girder with hatch opening is smaller than without opening one.

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Influence of geometric imperfections on the ultimate strength of the double bottom of a Suezmax tanker

Cited by 32 publications

References 27 publications

Methods for Fitting the Limit State Function of the Residual Strength of Damaged Ships

Methods for Fitting the Limit State Function of the Residual Strength of Damaged Ships

Elastoplastic Stability and Failure Analysis of FGM Plate with Temperature Dependent Material Properties under Thermomechanical Loading

Comparison of the Ultimate Strength with and without Hatch Opening Subjected to Longitudinal Bending

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