The effect of geometric imperfections on the buckling behaviour of composite laminated cylinders under external hydrostatic pressure

Tsouvalis, Nicholas G.; Zafeiratou, A.A; Papazoglou, V.J.

doi:10.1016/s1359-8368(02)00106-3

Cited by 35 publications

(24 citation statements)

References 8 publications

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“…This was confirmed by Hilburger et al [17] who used non-linear analysis to determine accurate, high-fidelity design knock-down factors to be used for predicting composite shell buckling and collapse loads during the design process. Tsouvalis et al [18] investigated the effect of the initial imperfection magnitude on the buckling load of a cylinder under external hydrostatic pressure and found good correlation between experimental and modelling results. Featherston [19] studied the effect of geometrical imperfections on the buckling and postbuckling behaviour of a simple aerofoil under combined shear and in-plane bending, both experimentally and using FE analysis, to determine appropriate knock down factors.…”

Section: Introductionmentioning

confidence: 98%

Buckling and postbuckling behaviour of Glare laminates containing splices and doublers. Part 2: Numerical modelling

Al-Azzawi

Kawashita

Featherston

2017

Composite Structures

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A 3D finite element model using cohesive elements and continuum (bulk) material damage models was developed to examine the progressive damage and failure behaviour of Glare R Fibre Metal Laminate (FML) specimens subjected to in-plane compressive loading. The specimens contained internal 'splice' and 'doubler' features and were either pristine or contained simulated manufacturing defects in the form of artificial delaminations. The initiation and growth of delaminations at the inter-laminar interfaces, damage in the glass fibre reinforced polymer (GFRP) plies, ductile damage in the resin pockets (FM94 epoxy) and the onset of plasticity in the metal layers were examined. Geometric imperfections and load eccentricity were incorporated in an explicit dynamic nonlinear analysis implemented in the software Abaqus/Explicit. A series of buckling tests on specimens with and without artificial delaminations were conducted for validation, which are described in detail in a companion paper. Tests were monitored using Digital Image Correlation (DIC) for visualisation of full-field displacements and strains whilst Acoustic Emission (AE) monitoring enabled detection and localisation of the onset and progression of damage. Results for 'Glare 4B' specimens incorporating longitudinal and transverse delaminations into both splice and doubler geometries are presented. These results revealed that in order for the finite element analyses to be validated, all the damage and plasticity mechanisms * Corresponding author. Email address: Al-AzzawiAS@cardiff.ac.uk Preprint submitted to Composite Structures May 9, 2017 described above need to be accounted for, as well as load eccentricity and geometry imperfections.

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Section: Introductionmentioning

confidence: 98%

Buckling and postbuckling behaviour of Glare laminates containing splices and doublers. Part 2: Numerical modelling

Al-Azzawi

Kawashita

Featherston

2017

Composite Structures

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“…It was soon realized that the problem could only be addressed through modeling taking into account the randomness of the imperfect geometries (Chryssanthopoulos and Poggi, 1995;Deml and Wunderlich, 1997;Schenk and Schuëller, 2003). Additional research revealed that, other sources of imperfections such as the variability of thickness, material properties, boundary conditions and misalignment of loading are also responsible for the reduction and scatter of the buckling load of shell structures (Palassopoulos, 1993;Morris, 1996;Elishakoff, 2000;Elishakoff et al, 2001;Arbocz and Starnes, 2002;Tsouvalis et al, 2003;Ikeda and Murota, 2008).…”

Section: Introductionmentioning

confidence: 99%

Buckling analysis of imperfect shells with stochastic non-Gaussian material and thickness properties

Papadopoulos

Stefanou

Papadrakakis

2009

International Journal of Solids and Structures

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a b s t r a c tIn this paper, the effect of material and thickness spatial variation on the buckling load of isotropic shells with random initial geometric imperfections is investigated. To this purpose, a random spatial variability of the elastic modulus as well as of the thickness of the shell is introduced in addition to the random initial geometric deviations of the shell structure from its perfect geometry. The main novelty of this paper compared to previous works is that a non-Gaussian assumption is made for the distribution of the two aforementioned uncertain parameters i.e. the modulus of elasticity and the shell thickness which are described by two-dimensional uni-variate (2D-1V) homogeneous non-Gaussian stochastic fields. The initial geometric imperfections are described as a 2D-1V Gaussian non-homogeneous stochastic field with properties derived from corresponding experimental measurements. Numerical examples are presented focusing on the influence of the non-Gaussian assumption on the variability of the buckling load, which is calculated by means of the Monte Carlo Simulation method. It is shown that the choice of the marginal probability distribution for the description of the material and thickness variability is crucial since it affects significantly the statistics of the buckling load of imperfection sensitive shell-type structures.

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“…7 In FML composite cylinders, buckling strength was influenced by many parameters such as ply orientation, fiber resin ratio, layer thickness, etc. 8 To investigate the influence of these parameters through experimental methods was too cumbersome and expensive. Hence, more emphasis was placed on quasi-static numerical simulation of buckling.…”

Section: Introductionmentioning

confidence: 99%

“…10 Collapse pressure being the end stage of buckling behavior controlled by many variables such as thickness variation and geometrical imperfections was investigated both by experimental and numerical methods. 2 Tsouvalis et al 8 numerically investigated the critical buckling behavior of hydrostatically pressurized mid-span of the composite cylinder along with FE convergence approaches. Buckling was mainly influenced by geometric imperfections such as out-of-roundness and thickness variation generated due to excess resin during manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the effect of fiber orientation on hydrostatic buckling behavior of fiber metal composite cylinder

Sumana

Sagar

Sharma

et al. 2015

Journal of Reinforced Plastics and Composites

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The external hydrostatic buckling behavior of fiber metal laminate (FML) composite cylinders was investigated numerically. The critical buckling pressure predicted by eigenvalue analysis was compared with experimental results. The numerical results showed different modes of buckling and buckling deformation for cylinders of different fiber orientation when subjected to external hydrostatic loading. FML cylinder with 0 /90 fiber orientation exhibited higher buckling strength and lower buckling deformation as compared to FML cylinders of 60 /30 , AE45 , and AE55 fiber orientations. The orientation of fiber has significant influence on the performance of FML composite cylinder as compared to fiberreinforced plastic thickness. The correlation between numerical and experimental results is discussed in terms of buckling strength, circumferential stiffness, and buckling deformations. It was observed that the cylinders were less sensitive to initial imperfections irrespective of fiber-reinforced plastic thickness. In addition, the results of finite element analysis and experimental results indicate good matches.

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The effect of geometric imperfections on the buckling behaviour of composite laminated cylinders under external hydrostatic pressure

Cited by 35 publications

References 8 publications

Buckling and postbuckling behaviour of Glare laminates containing splices and doublers. Part 2: Numerical modelling

Buckling and postbuckling behaviour of Glare laminates containing splices and doublers. Part 2: Numerical modelling

Buckling analysis of imperfect shells with stochastic non-Gaussian material and thickness properties

Numerical analysis of the effect of fiber orientation on hydrostatic buckling behavior of fiber metal composite cylinder

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