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  • 标题:Finite Element Modeling And Experimental Validation Of Buckle Arrestors For Deepwater Pipelines.
  • 本地全文:下载
  • 作者:Luciano O. Mantovano ; Pablo Amenta ; Roberto Charreau
  • 期刊名称:Mecánica Computacional
  • 印刷版ISSN:2591-3522
  • 出版年度:2006
  • 卷号:XXV
  • 期号:6
  • 页码:687-706
  • 出版社:CIMEC-INTEC-CONICET-UNL
  • 摘要:Deepwater pipelines are designed to withstand, without collapsing, the external
    pressure acting on them and the bending imposed on them, either by the laying process or by
    the topology of the sea bottom. In previous publications we have developed and
    experimentally validated finite element models to predict collapse loads and collapse
    propagation loads.
    Even tough a pipeline normally has enough strength to prevent collapse under normal
    operation conditions, under some accidental conditions collapse may occur at some section.
    Being the collapse propagation pressure much lower than the collapse pressure, the collapse,
    once it occurs, may propagate through large distances along the pipeline. To avoid the
    occurrence of this propagation, collapse arrestors are normally welded to pipelines and, if
    the cross-over pressure is higher than the external pressure, they prevent the collapse
    propagation.
    The accurate and reliable determination, using finite element models, of cross-over pressures,
    for different combinations pipes / arrestors, is a key engineering capability.
    In this paper we discuss the finite element models that we developed, using shell elements, for
    the calculation of cross over pressures and their experimental validation for seamless steel
    pipes.
    In the literature two cross-over mechanisms were identified: the flattening and the flipping
    modes; their occurrence depends on the ratio (arrestors stiffness/pipes stiffness). Numerical
    and experimental results that we obtained for the two cases are compared and we show that
    the agreement between them for both, cross-over pressure and cross-over mechanism, is
    excellent.
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