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An Analytical Treatment of Buckling and Instability of Tensile Armours in Flexible Pipes

[+] Author and Article Information
Svein Savik

Professor Department of Marine Technology Norwegian University of Science and Technology Trondheim, Norway
svein.savik@ntnu.no

Mats J. Thorsen

PostDoc Fellowship holder Department of Marine Technology Norwegian University of Science and Technology Trondheim, Norway
mats.j.thorsen@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4036205 History: Received November 04, 2014; Revised February 20, 2017

Abstract

The present paper addresses aspects related to local buckling and instability of tensile armours in flexible pipes. Analytical models for evaluating the tensile armour buckling capacity in both transverse (radial and lateral) directions are presented based on formulating the linearised differential equation describing transverse stability of the thin curved wire assuming no friction. Then analytical models for the ultimate capacity of the outer sheath and anti-buckling tape are formulated and a combined criteria for radial instability is proposed based on considering both the radial buckling capacity of the tensile armour and the ultimate capacity of the outer sheath and tape. Thereafter, a study is performed comparing the proposed models with test data and alternative models available in the literature.

Copyright (c) 2017 by ASME
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