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Title: Nonlinear behaviour of offshore flexible risers
Authors: Norouzi, Shayan
Advisors: Bahai, H
Alfano, G
Keywords: Numerical modeling;Tests;Bending;Compression;Prototype
Issue Date: 2014
Abstract: As the search for exploration of oil and gas moves to deeper waters, flexible unbounded risers have become the main means of extracting hydro carbonates from deep waters. In this context, structural integrity of flexible risers has become a crucial issue for the offshore industry. In this study, experimental tests and detailed finite element analyses were carried out on a scaled down model of a flexible riser pipe. The model used consists of four layers which include two cylindrical polycarbonate tubes and two steel helical layers. One helical layer represents the carcass layer in an actual flexible riser whilst the other represents the riser tendon armour layers, wounded around the pipe assembly. The model was first subjected to a three point bending load in order to study its bending-curvature behaviour experimentally. Then, the specimen was tested under compressive load with different pressure values to investigate the effect of pressure on the pipe deformation. Additionally, the effects of pure axial load and pure pressure with no load on the model were examined. The effects of static load on the deformation of a single helical tendon layer and creep behaviour (Shetty, 2013) of the layer were also studied. The investigation of a single tendon under axial load using finite element based software shows residual strains results are in good agreement with the experiments. The numerical model also shows a non-linear behaviour in bending-moment curvature for flexible pipe which is in a good agreement with the experimental data.
Description: This thesis was submitted for the degree of Master of Philosophy and awarded by Brunel University
Appears in Collections:Civil Engineering
Dept of Mechanical Aerospace and Civil Engineering Theses

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