Analytical and experimental studies on flexible pipes tensile armors lateral instability in cyclic bending

This paper aims at investigating the flexible pipe armor wires lateral instability mechanism. For a flexible pipe subjected to longitudinal compressive loads associated with cyclic bending, analytical model that depicts the slips of the armor wires in bending and the ultimate state of the armor wires after numerous bending cycles, stable or unstable, is presented. This model is capable of evaluating the equilibrium path of the armor wire after numerous bending cycles in stable conditions, as well as estimating the critical longitudinal compressive load that may eventually cause the lateral instability of the armor layers. The analytical estimation of the armor wires lateral stability limit is compared with existing test data available in the literature, as well as the data of two new tests introduced in the present context, where excellent correlations are demonstrated. In addition, some useful suggestions for improving the design of flexible pipes against the armor wires lateral instability failure are presented.


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  • Accession Number: 01719991
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 17 2019 3:04PM