Steel tubes are structural components whose strength is governed by initial imperfections, the cross-sectional ovalisation in particular. In addition, carbon steel tubes are susceptible to corrosion which is another influencing factor in tube collapse. Of all the possible types of loading which may precipitate tube collapse, external pressure (along with bending) is one of the most relevant in offshore applications. To date the methodology used to quantify the damage suffered by structures subjected to corrosion is usually based on a uniform reduction in thickness determined from the material mass loss in a specified period of time. However, this methodology has been shown to be inadequate for design purposes, especially where compressive failure is the critical mode. Structural analysis techniques, such as non-linear finite element analysis, have enabled the modelling of corroded surfaces and geometrical imperfections, thus enabling the reduction of uncertainty that is embedded into the behaviour and strength prediction of new and in-service structures the results of an investigation into the structural mechanics of corroded steel tubes is presented. The discrepancies resulting from two approaches to modelling the effects of corrosion, uniform thickness reduction and quasi-random thickness, is quantified. It is shown how the geometrical configuration of the tube's corroded surface influences its strength under external pressure and how it may lead to collapse localisation phenomena.
Collapse of imperfect corroded steel tubes
Bruch ungleichmäßig korrodierter Stahlrohre
2003
9 Seiten, 9 Bilder, 7 Tabellen, 11 Quellen
Aufsatz (Konferenz)
Englisch
Repairing Corroded Tubes With Swaged and Brazed Inserts
Online Contents | 1996
Collapse of partially corroded or worn pipe under external pressure
Tema Archiv | 2008
|Time-Dependent Reliability Analysis of Corroded Steel Beam
Online Contents | 2020
|