Plastic collapse of pipe bends under combined internal pressure and in-plane bending

Robertson, Tony; Li, Hongjun; Mackenzie, Donald

doi:10.1016/j.ijpvp.2004.09.005

Cited by 110 publications

(44 citation statements)

References 4 publications

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“…The codes guard against failure through appropriate choice of material and limiting the loads acting on the system [2]. Three types of main failure were taken into consideration in the design, i.e., the gross plastic deformation, the incremental plastic collapse (ratcheting) and the fatigue [2]. Gross plastic deformation is the fundamental ductile failure mode associated with static action.…”

Section: Introductionmentioning

confidence: 99%

On the evaluation of plastic buckling of pipeline bending

Zheng

Teng

et al. 2017

IRASE

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In the present paper, various formulae for evaluating critical buckling strain of bending pipeline are analyzed on basis of its actual nature, available test data or fi nite element calculation results. The available test data is from different resources, it provides a more objective comparison; Especially, the experimental bending buckling data of Corona et al. and Kyriakides et al. for Al-6061-T6 aluminum pipes with various D/t value, as well as the prediction of Minnaar's FEM regressive formula for high grade steel pipe are reanalyzed to check the reasonability of the plastically elliptical cross-section model. It shows that the consequence of the plastically elliptical cross-section model is more reasonable than others for the critical buckling strain prediction of a pipe bending in most cases.

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Section: Introductionmentioning

confidence: 99%

On the evaluation of plastic buckling of pipeline bending

Zheng

Teng

et al. 2017

IRASE

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“…Authors proved that internal pressure increases the limit buckling load of thin cylindrical shells for different load conditions such as axial load [9], torsion [10] and bending [11,12]. In the case of bending, benefits of pressure are not only related to the stabilisation effect but also to an anti-flattening effect which decreases the cross-section inertial moment reduction and, therefore, the stress in the bent pipe [13].…”

Section: Introductionmentioning

confidence: 99%

Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads

Polenta

Garvey

Chronopoulos

et al. 2016

Thin-Walled Structures

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The paper proposes a novel type of stiffener designed to bear bending loads by exploiting internal pressure effects. The stiffener is made of two adjacent thin-walled pipes (r/t ≥ 50) jointed with a connecting strip. Such structure is shown to have higher performance against buckling failure compared to a single pipe and its geometry allows for good exploitation of internal pressurisation.The study is conducted by using the FEA software ANSYS and the analysis technique is the linear perturbation buckling analysis. Internal pressure ranges from 0 to 1.4 MPa. The buckling mechanisms are observed for a set of models with different values of length, wall thickness and geometric variation of the cross-section. It is shown that two different buckling modes can take place. However, for a given geometry, the level of pressure can alter the behaviour and lead to one mode rather than the other one.Potential of the presented structure is maximised by the use of high performance materials and a possible aerospace engineering application is presented.

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“…Several practical problems that can occur when applying the TES criterion have been identified in the literature [4][5][6][7]. In addition to performing a check against GPD under static loads, the Codes also require the designer to consider the possibility of a buckling instability failure mode occurring prior to the formation of a full GPD mechanism.…”

Section: Introductionmentioning

confidence: 99%

Design by analysis of ductile failure and buckling in torispherical pressure vessel heads

Mackenzie

Camilleri

Hamilton

2008

Thin-Walled Structures

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This version is available at https://strathprints.strath.ac.uk/7495/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Abstract:Thin shell torispherical pressure vessel heads are known to exhibit complex elasticplastic deformation and buckling behaviour under static pressure. In pressure vessel Design by Analysis, the designer is required to assess both of these behaviour modes when specifying the allowable static load. The EN and ASME Boiler and Pressure Vessel Codes permit the use of inelastic analysis in design by analysis, known as the direct route in the EN Code. In this paper, plastic collapse or gross plastic deformation loads are evaluated for two sample torispherical heads by 2D and 3D FEA based on an elastic-perfectly plastic material model. Small and large deformation effects are considered in the 2D analyses and the effect of geometry and load perturbation are considered in the 3D analysis. The plastic load is determined by applying the ASME Twice Elastic Slope Criterion of plastic collapse and an alternative plastic criterion, the Plastic Work Curvature criterion. The formation of the gross plastic deformation mechanism in the models is considered in relation to the elastic-plastic buckling response of the vessels. It is concluded that in both cases, design is limited by formation of an axisymmetric gross plastic deformation in the knuckle of the vessels prior to formation of non-axisymmetric buckling modes.

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Plastic collapse of pipe bends under combined internal pressure and in-plane bending

Cited by 110 publications

References 4 publications

On the evaluation of plastic buckling of pipeline bending

On the evaluation of plastic buckling of pipeline bending

Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads

Design by analysis of ductile failure and buckling in torispherical pressure vessel heads

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