Buckling of Pressurized Axisymmetrically Imperfect Cylinders under Axial Loads

Teng, Jinguang; Rotter, J. M.

doi:10.1061/(asce)0733-9399(1992)118:2(229)

Cited by 77 publications

(46 citation statements)

References 14 publications

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“…6 below, were introduced at evenly-spaced intervals up the silo so that the wall had many local imperfections. This imperfection form was developed as a realistic simulation of the joints created during welding of metal sheets, and has been widely used in numerical studies of imperfection sensitivity in cylinders because it is one of the most damaging credible imperfection forms for a uniformly compressed cylinder (Teng & Rotter, 1992;Song et al, 2004).…”

Section: Numerical Modelmentioning

confidence: 99%

Study of Buckling in Steel Silos under Eccentric Discharge Flows of Stored Solids

Sadowski

Rotter

2010

J. Eng. Mech.

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The most serious loading condition for slender thin-walled metal silos has long been recognized to be the condition of discharge, with eccentric discharge causing more catastrophic failures than any other. Two key reasons for this high failure rate are the difficulties in characterizing the pressure distribution caused by eccentric solids flow, and in understanding the associated unsymmetrical stresses in the silo wall. Few studies have addressed either the linear elastic behavior of such a silo or its buckling failure under eccentric discharge.In this study, the eccentric discharge pressures are characterized using the new rules of the European Standard EN 1991-4 on Silos and Tanks. This novel description of unsymmetrical pressures permits a study of the structural behavior leading to buckling during eccentric discharge, including the critical effects of change of geometry and imperfection sensitivity, to be undertaken using geometrically and materially nonlinear computational analyses. The mechanics of the behavior are found to be quite complicated. A silo which is safe under axisymmetric loading is found to be susceptible to catastrophic stability failure under eccentric discharge.

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Section: Numerical Modelmentioning

confidence: 99%

Study of Buckling in Steel Silos under Eccentric Discharge Flows of Stored Solids

Sadowski

Rotter

2010

J. Eng. Mech.

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“…The strake edges are slightly curled due to the rolling process and the shrinking of the circumferential weld during cooling [55]. The result is a regular axisymmetric depression oriented towards the interior of the shell [41,46]. Two rationally-based and idealised mathematical characterisations of the shape of this depression were proposed by Rotter and Teng [55].…”

Section: Behaviour Of Spiral Welded Cylinders Under Axial Compressionmentioning

confidence: 99%

“…Two rationally-based and idealised mathematical characterisations of the shape of this depression were proposed by Rotter and Teng [55]. This has since become one of the most common and probably most deleterious realistic imperfection forms for thin-walled hollow cylinders under axial compression [41,56,57,58,59,60]. Known as the 'axisymmetric weld depression', it is defined using the present notation as:…”

Section: Behaviour Of Spiral Welded Cylinders Under Axial Compressionmentioning

confidence: 99%

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Modelling and behaviour of cylindrical shell structures with helical features

Sadowski

Rotter

2014

Computers & Structures

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Spiral welding or bonding is a particularly efficient and cost-effective method of constructing continuous tubes. However the understanding of the mechanics of such structures is not yet well developed. This is in no small part due to the difficulties involved in their computational analysis.Cylindrical shells are traditionally modelled using rectangular finite elements oriented parallel to the meridional and circumferential axes. However, spiral features are particularly challenging to model because such features are not orthogonal to the axes of the cylinder. Commercial finite element pre-processors often struggle to mesh these with anything other than a free triangulation. A superior mesh would consist of wellconditioned rectangular elements oriented orthogonally with respect to the axes of the helix, termed a 'helical mesh', but this requires significant programming effort. A helical mesh is particularly important if features of the shell such as geometric imperfections, residual stresses, weld material and heat affected zones, and bonding in systems using adhesives are required to follow the helical form. Helically wound structural forms are widely used in different applications that demand continuous cylindrical forms. The most common uses in structural engineering are in spiral wound tubes, piles, chimneys and pipelines. This paper describes a powerful computational procedure developed by the authors to generate high quality helical meshes. Special emphasis is placed on the modelling of geometric deviations defined relative to the helix, appropriate for the analysis of spiral welded and stiffened tubes. The effect of helical meshing is illustrated using benchmark examples of perfect and imperfect cylinders under axial compression.Published in: Computers and Structures, 133C,[90][91][92][93][94][95][96][97][98][99][100][101][102]

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“…In this case, the induced gain on the buckling load is zero. To avoid these pathologies, the reinforcement does not cover the total length of the shell but stops at a distance δ 2.444 Rt √ from the shell edge [18,19]. is distance corresponds to the length, at each extremity of the shell, perturbed by bending stress caused by the boundary conditions.…”

Section: Case Where the Multilayered Sti Ening Is Not E Cientmentioning

confidence: 99%

Buckling Behavior of Metallic Cylindrical Shell Structures Strengthened with CFRP Composite

Draidi

Bui

Limam

et al. 2018

Advances in Civil Engineering

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e objective of this study is to evaluate the effect of a CFRP composite layer on the buckling behavior of metallic cylindrical shells. To enhance the bearing capacity of steel shells, classical solutions consider internal or external metallic stiffeners (stringers and/or rings) welded or riveted to the shell. Here, an external skin of composite material which wraps the whole metallic skin of the shell is studied. To be valid for metallic shells structures (storage tanks like silos) as well as for metal pipes (gas or oil pipeline), the procedure for setting up and implementing the composite must be simple. e recommended solution is therefore tested through experimental tests to find their limits and the configuration of optimal behavior. A consistent enhancement of bearing capacity is observed. is experimental base serves also to consolidate a numerical model which corroborates the experimental results. e good correlation between experimental and numerical results is confirmed for the whole loading process, for unstiffened and stiffened shells. For metallic unstiffened shell, an adequacy between experiment and simulation is noticed in the mainly membrane precritical behavior, during the buckling initiation characterized by the boundary layer problem corresponding to axisymmetric wavelength appearance near boundaries and in the postcritical domain associated to localization of the buckling mode at one extremity of the shell. For stiffened configuration, the enhancement of the bearing capacity of the shell is correctly gauged; this confirms the possibility to use finite element simulation for the design.

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Buckling of Pressurized Axisymmetrically Imperfect Cylinders under Axial Loads

Cited by 77 publications

References 14 publications

Study of Buckling in Steel Silos under Eccentric Discharge Flows of Stored Solids

Study of Buckling in Steel Silos under Eccentric Discharge Flows of Stored Solids

Modelling and behaviour of cylindrical shell structures with helical features

Buckling Behavior of Metallic Cylindrical Shell Structures Strengthened with CFRP Composite

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