Influence of ovalisation on the plastic collapse of thick cylindrical tubes under uniform bending

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Title: Influence of ovalisation on the plastic collapse of thick cylindrical tubes under uniform bending
Authors: Wang, J
Sadowski, AJ
Rotter, JM
Item Type: Journal Article
Abstract: An accurate assessment of the bending resistance of thick cylindrical metal tubes is necessary for the safe and efficient design of pipelines, piles, pressure vessels, circular hollow sections and other common tubular structures. Bending tests continue to be widely performed as part of many engineering research programmes, but despite their ubiquity they often generate results that are difficult to interpret. Discrepancies from the attainment of the classical full plastic moment are common and often attributed to a mixture of ovalisation, local buckling, imperfections and strain hardening. However, the effects of these phenomena are yet to be quantified in isolation, even for a system as classical as a cylinder under uniform bending. The goal of this computational study is to quantify the extent to which geometrically nonlinear effects, specifically ovalisation and bifurcation buckling, may depress the resistance of a thick perfect cylinder under uniform bending that would otherwise be expected to attain the full plastic moment. Simulations are performed using two- and three-dimensional finite element models with a simple ideal elastic-plastic material law that excludes the influence of strain hardening. Additionally, the study aims to arm designers of test programmes on the bending of tubulars with ‘rules of thumb’ to approximately quantify the likely influence of tube length on their results, recently shown to be an important parameter controlling geometric nonlinearity. For thick tubes, ovalisation at the plastic limit state under bending is found to be almost negligible.
Issue Date: 1-Dec-2018
Date of Acceptance: 5-May-2018
ISSN: 0308-0161
Publisher: Elsevier
Start Page: 94
End Page: 99
Journal / Book Title: International Journal of Pressure Vessels and Piping
Volume: 168
Copyright Statement: © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (
Sponsor/Funder: Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/N024060/1
Keywords: Science & Technology
Engineering, Multidisciplinary
Engineering, Mechanical
Thick tube
Cylindrical shell
Plastic collapse
Plane strain
Length effect
Mechanical Engineering & Transports
0913 Mechanical Engineering
Publication Status: Published
Online Publication Date: 2018-05-08
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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