The buckling of externally pressurised pipes degraded by interior corrosion

A. P. F. Little, B. Hassanati, C. T. F. Ross

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The research presented in this paper investigated the buckling resistance of initially circular pipes that have suffered interior corrosion. The finite element method is used and novel empirical techniques are introduced. Computer models were produced with varying wear depth along the pipe. Both linear and non-linear analyses using ANSYS APDL (ANSYS Parametric Design Language) with solid shell SOLSH190 elements were performed. The buckling pressures for increasing wear depth for three sizes of theoretical models are presented. Laboratory models tested in previous experimental work were investigated. These results compared extremely favourably, giving confidence in the non-linear FEA analysis. All interior corrosion models were analysed using ANSYS Workbench with Solid 186 elements and different element types were used to validate the results. A reduction factor is proposed which accounts for the effects of corrosion, allowing collapse pressures to be predicted using techniques such as the von Mises and the Windenburg and the Trilling method. This is also known as the David Taylor model Basin (DTMB) formula. In addition, an equivalent cylinder is defined and used with design charts to predict buckling. Both empirical methods were shown to predict buckling pressures for various depths of wear with reasonable accuracy.

    Original languageEnglish
    Title of host publicationProceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering
    EditorsJ. Kruis, Y. Tsompanakis, B. H. V. Topping
    PublisherCivil-Comp Press
    ISBN (Print)978-1905088638
    DOIs
    Publication statusPublished - Sep 2015
    EventFifteenth International Conference on Civil, Structural and Environmental Engineering Computing - Prague, Czech Republic
    Duration: 1 Sep 20154 Sep 2015
    http://www.civil-comp.com/pubs/catalog.htm?t=descrip&f=cc15

    Publication series

    NameCivil-Comp Proceedings
    Volume108
    ISSN (Print)1759-3433

    Conference

    ConferenceFifteenth International Conference on Civil, Structural and Environmental Engineering Computing
    Country/TerritoryCzech Republic
    CityPrague
    Period1/09/154/09/15
    Internet address

    Keywords

    • ANSYS
    • buckling
    • external hydrostatic pressure
    • internal wear
    • non-linear
    • thinness ratio
    • von Mises

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