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On the role of localizations in buckling of axially compressed cylinders

Research output: Contribution to journalArticle

Original languageEnglish
Article number20190006
Number of pages27
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume475
Issue number2224
DOIs
DateSubmitted - 1 Jan 2019
DateAccepted/In press - 7 Mar 2019
DatePublished (current) - 17 Apr 2019

Abstract

The collapse of axially compressed cylinders by buckling instability is a classic problem in engineering mechanics. We revisit the problem by considering fully localized post-buckling states in the form of one or multiple dimples. Using nonlinear finite-element methods and numerical continuation algorithms, we trace the evolution of odd and even dimples into one axially localized ring of circumferentially periodic diamond-shaped waves. The growth of the postbuckling pattern with varying compression is driven by homoclinic snaking with even- and odd-dimple solutions intertwined. When the axially localized ring of diamond-shaped buckles destabilizes, additional circumferential snaking sequences ensue that lead to the Yoshimura buckling pattern. The unstable single-dimple state is a mountain-pass point in the energy landscape and therefore forms the smallest energy barrier between the pre-buckling and post-buckling regimes. The small energy barrier associated with the mountain-pass point means that the compressed, pre-buckled cylinder is exceedingly sensitive to perturbations once the mountain-pass point exists. We parameterize the compressive onset of the single-dimple mountain-pass point with a single non-dimensional parameter, and compare the lower-bound buckling load suggested by this parameter with over 100 experimental data points from the literature. Good correlation suggests that the derived knockdown factor provides a less conservative design load than NASA's SP-8007 guideline.

    Research areas

  • buckling, cylinders, localisation, nonlinearities, Shell buckling, Pattern formation, Localization, Buckling, Snaking

    Structured keywords

  • Bristol Composites Institute ACCIS

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via The Royal Society at https://doi.org/10.1098/rspa.2019.0006 . Please refer to any applicable terms of use of the publisher.

    Final published version, 2 MB, PDF-document

    Licence: CC BY

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