A new approach to instability testing of shells

Khan, Md. Raisuddin; Akanda, Md. Abdus Salam; Uddin, Mohammed Forhad

doi:10.1016/s0308-0161(98)00001-5

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…Refs. [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. Figure 2(a) shows an open-ended pressure chamber, whereby the end-closure is designed to be directly attached to the specimen.…”

Section: Conventional External Pressure Testing Methodsmentioning

confidence: 99%

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A Review of External Pressure Testing Techniques for Shells including a Novel Volume-Control Method

MacKay

Keulen

2009

Exp Mech

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A review of conventional testing methods for applying external hydrostatic pressure to buckling-critical shells is presented. A new "volume-control" pressure testing method, aimed at preventing catastrophic specimen failures and improving control of specimen deformation near the critical load, is also introduced. The implementation of conventional and volume-control systems in an experimental program involving the destructive pressure testing of ring-stiffened cylinders is described. The volume control method was found to improve control of the specimen deformations, especially near the critical load, and catastrophic failures observed while using a conventional setup were avoided. The quasi-static tracking of postcollapse load-deformation relationships for snap-through buckling behaviour was possible while using a volumecontrol system, but precise control of dynamic shell deformations during buckling was not achieved for specimens failing with large buckling lobes. Expressions for estimating the available control over specimen deformations for pressure testing systems are presented.

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Section: Conventional External Pressure Testing Methodsmentioning

confidence: 99%

“…A secondary advantage of this system is that the volume of fluid expelled from the specimen during testing (i.e. the volume change of the specimen) can be monitored and used to roughly estimate the load-deformation behaviour and identify the failure pressure [51].…”

Section: Conventional External Pressure Testing Methodsmentioning

confidence: 99%

A Review of External Pressure Testing Techniques for Shells including a Novel Volume-Control Method

MacKay

Keulen

2009

Exp Mech

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“…Godoy's study deals with the modeling of shape deviations in thin-walled plates and shells using finite elements together with perturbation techniques [10]. Khan et al presented an experimental technique for the buckling test of shells under external pressure to determine buckling load [11]. Miller worked on buckling criteria for torispherical heads under internal pressure which are especially outside the limits of ASME codes [12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Geometric and Load Perturbation to Buckling in Multilayered Torispherical Pressure Vessel Heads

Şenalp¹

2015

Journal of Thermal Engineering

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The object of this paper is to investigate the effects of geometry and load perturbation to buckling in multilayered pressure vessel heads. The pressure vessel head in concern is thin walled torispherical geometry. Geometric and load perturbation can alter both the critical load for buckling and the buckled shape. Two and three layered torsispherical heads are considered. Two layered models include steel-aluminum and titanium-aluminum configurations and three layered models include copper-steel-copper configuration. Internally pressurized three-dimensional torispherical pressure vessel head model that is previously used in literature is constructed. As a first step eigenvalue solutions are obtained for each model. After this instability solutions with large deformation effects are conducted to obtain more realistic instability pressure values nonlinear. The solution is performed by finite element program ANSYS Workbench. In nonlinear analyses, perfectly plastic material model is used. It is concluded that geometric and load perturbations cause the instability pressure to decrease and cause the structure to buckle at a lower pressure value. It is also observed that for steel-aluminum configuration geometric perturbation is more critical than load perturbation whereas for aluminum-titanium the reverse is valid.

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