Elastic imperfect tip-loaded cantilever cylinders of varying length

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Title: Elastic imperfect tip-loaded cantilever cylinders of varying length
Authors: Wang, J
Sadowski, AJ
Item Type: Journal Article
Abstract: A number of recent publications have explored the crucial relationship between the length of a thin cylindrical shell and the influence of pre-buckling cross-sectional ovalisation on its nonlinear elastic buckling capacity under bending. However, the research thus far appears to have focused almost exclusively on uniform bending, with ovalisation under moment gradients largely neglected. This paper presents a comprehensive computational investigation into the nonlinear elastic buckling response of perfect and imperfect thin cantilever cylinders under global transverse shear. A complete range of practical lengths was investigated, from short cylinders which fail by shear buckling to very long ones which exhibit local meridional compression buckling with significant prior cross-section ovalisation. Two imperfection forms were applied depending on the length of the cylinder: the linear buckling eigenmode for short cylinders and a realistic weld depression imperfection for long cylinders. The weld depression imperfection was placed at the location where the cross-section of the perfect cylinder was found to undergo peak ovalisation under transverse shear, a location that approaches the base support with increasing length. Compact closed-form algebraic expressions are proposed to characterise the elastic buckling and ovalisation behaviour conservatively, suitable for direct application as design equations. This study contributes to complete the understanding of cylindrical structures of varying length where the dominant load case is global transverse shear, including multi-strake aerospace shells with short individual segments between stiffeners and long near-cylindrical wind-turbine support towers and chimneys under wind or seismic action.
Issue Date: 1-May-2018
Date of Acceptance: 10-Feb-2018
URI: http://hdl.handle.net/10044/1/57045
DOI: https://dx.doi.org/10.1016/j.ijmecsci.2018.02.027
ISSN: 0020-7403
Publisher: Elsevier
Start Page: 200
End Page: 210
Journal / Book Title: International Journal of Mechanical Sciences
Volume: 140
Copyright Statement: © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/N024060/1
Keywords: 0910 Manufacturing Engineering
0905 Civil Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status: Published
Online Publication Date: 2018-02-15
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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