Instability of imperfect composite cylindrical shells under combined loading

Tafreshi, Azam; Bailey, Colin

doi:10.1016/j.compstruct.2006.02.031

Cited by 41 publications

(20 citation statements)

References 39 publications

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“…4,5 There are many studies on the bucking and postbucking of cylindrical shell, which are Underwater vehicles that operate in deep waters require a pressure hull to maintain the sufficient strength and stiffness against external hydrostatic pressure. We investigated the validity of the finite element method (FEM) that is applied to a buckling analysis of the filament-wound composite cylinder, subjected to an external hydrostatic pressure.…”

Section: Introductionmentioning

confidence: 99%

Buckling analysis of filament-wound thick composite cylinder under hydrostatic pressure

Kim

Cho

Bae

et al. 2010

Int. J. Precis. Eng. Manuf.

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NOMENCLATURE E1,E2,E2 = Elastic Modulus G12,G23,G13 = Shear Modulus v12 ,v23, v13 = Poisson's ratio IntroductionUnderwater vehicles, that operate in deep water, are subjected to high external hydrostatic pressure. In general, the pressure hull of an underwater vehicle has a stiffened cylindrical shell structure, and the spherical or elliptic shells are attached to both ends. Shell is the structure often found in vessels, submarines, aircrafts, and buildings. Accordingly, there have been many studies on the analysis of shell structures, and the variety of shell theories has been suggested. In particular, when the shell undergoes a pressure load, the buckling can take place at a stress which is far lower than the material strength. Therefore, the compressive buckling strength of a shell should be taken into consideration. 1,2The performance of a structure can be improved if its weight is be reduced by using the low-density material such as a composite, compared to high strength steel, titanium alloy, and aluminum alloy. Experiments on composite buckling are limited by equipments and costs, and thus the finite element analysis (FEA) method is used to simulate the testing. 3 The FEA results for isotropic materials, such as metals, are in good agreement with experimental results. However, the FEA results for composite materials, that are anisotropic, can show a relatively large difference with experimental results. Accordingly, it is necessary to identify the problems with the FEA results and bridge the gaps by optimizing the finite element models.The majority of studies on conventional composites focus on composites made by prepreg method. 4,5 There are many studies on the bucking and postbucking of cylindrical shell, which are Underwater vehicles that operate in deep waters require a pressure hull to maintain the sufficient strength and stiffness against external hydrostatic pressure. We investigated the validity of the finite element method (FEM) that is applied to a buckling analysis of the filament-wound composite cylinder, subjected to an external hydrostatic pressure. Two methods were suggested for the buckling analysis of a filament-wound thick composite cylinder under hydrostatic pressure: using the equivalent properties of the composite, and using stacking sequence. The hydrostatic pressure test was conducted to verify the FEA. Test results were compared with the previous results obtained by FEM on the buckling of a filament-wound composite cylinder under hydrostatic pressure. FEM analysis results were in good agreement with the test results. The difference between FEM results and the test results was approximately 1~5%.

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Section: Introductionmentioning

confidence: 99%

Buckling analysis of filament-wound thick composite cylinder under hydrostatic pressure

Kim

Cho

Bae

et al. 2010

Int. J. Precis. Eng. Manuf.

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“…Rahman and Jansen [131] investigated imperfecttion sensitivity of composite cylindrical shells under axial compression using a finite element method. Tafreshi and Bailey [314] investigated the effects of combined loading on imperfect composite shell structures. Wardle and Lagace [315] compared experimental and numerical computations of the buckling response from transversely loaded composite shell structures.…”

Section: Imperfect Shellsmentioning

confidence: 99%

Review of Recent Literature on Static Analyses of Composite Shells: 2000-2010

Qatu¹,

Asadi²,

Wang³

2012

OJCM

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Laminated composite shells are frequently used in various engineering applications including aerospace, mechanical, marine, and automotive engineering. This article reviews the recent literature on the static analysis of composite shells. It follows up with the previous work published by the first author [1-4] and it is a continuation of another recent article that focused on the dynamics of composite shells [3]. This paper reviews most of the research done in recent years (2000-2010) on the static and buckling behavior (including postbuckling) of composite shells. This review is conducted with an emphasis on the analysis performed (static, buckling, postbuckling, and others), complicating effects in both material (e.g. piezoelectric) and structure (e.g. stiffened shells), and the various shell geometries (cylindrical, conical, spherical and others). Attention is also given to the theory being applied (thin, thick, 3D, nonlinear …). However, more details regarding the theories have been described in previous work [1,3]

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“…The other most recent approach is to introduce an equivalent probabilistic geometric imperfection derived from the available imperfection data bank, which properly simulates the physical characteristics of the shell structure subject to buckling [12,13]. This equivalent geometric imperfection can be incorporated in the non-linear FE model by scaling the first eigenmode shape from a bifurcation analysis of the perfect shell [27]. As the amplitude of the imperfection shape has a great influence on the buckling behavior of the shell structure.…”

Section: Introductionmentioning

confidence: 99%

Buckling of thin‐walled cylindrical shells under axial compression

Ullah

2009

Numerical Meth Engineering

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SUMMARYLightweight thin-walled cylindrical shells subjected to external loads are prone to buckling rather than strength failure. The buckling of an axially compressed shell is studied using analytical, numerical and semi-empirical models. An analytical model is developed using the classical shell small deflection theory. A semi-empirical model is obtained by employing experimental correction factors based on the available test data in the theoretical model. Numerical model is built using ANSYS finite element analysis code for the same shell. The comparison reveals that the analytical and numerical linear model results match closely with each other but are higher than the empirical values. To investigate this discrepancy, non-linear buckling analyses with large deflection effect and geometric imperfections are carried out. These analyses show that the effects of non-linearity and geometric imperfections are responsible for the mismatch between theoretical and experimental results. The effect of shell thickness, radius and length variation on buckling load and buckling mode has also been studied.

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Instability of imperfect composite cylindrical shells under combined loading

Abstract: A numerical study using the non-linear finite element analysis has been carried out to investigate the response of composite cylindrical shells subject to combined loading. The

Cited by 41 publications

References 39 publications

Buckling analysis of filament-wound thick composite cylinder under hydrostatic pressure

Buckling analysis of filament-wound thick composite cylinder under hydrostatic pressure

Review of Recent Literature on Static Analyses of Composite Shells: 2000-2010

Buckling of thin‐walled cylindrical shells under axial compression

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