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Tensile armour buckling in flexible pipes
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Marine Technology.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

The exible pipelines has been widely used by the oil and gas industry the last decades and this trend is expected to continue as the operating depths are increased further. For deep water applications the radial and lateral buckling modes can be critical. Many studies has been carried out using nite element models to study these failure modes. In this thesis a nite element model is created with the aim to recreate results obtained in a recently published article by Vaz and Rizzo. The model is built up using pipe, beam, contact and spring elements to represent the complex behaviour of the cross section. The loading is carried out by rst applying the dry mass, then the external pressure and nally end compression. When comparing buckling loads generated in this thesis by the ones in the article by Vaz and Rizzo the observation made is that the buckling loads from this thesis are signicantly higher. When comparing only the inclination of the end shortening versus buckling load curves it was seen that the curves from article had a only slightly larger inclination than the results from the analyses in this thesis. This indicates that there is a small dierence in the stiness used. By modifying the stiness it should be possible to get the same inclination of the curve. Analyses were also carried out on how the slip distance aects the buckling loads. By increasing the slip distance by 50% and 100% it was observed that the buckling loads were reduced drastically. In the article by Vaz and Rizzo no information is given on the slip distance. By tuning the slip distance and stiness of the springs it should therefore by possible to obtain the exact same results as in the article. This clearly illustrates the importance of stating all assumptions and input parameters when describing models used for analysis.

Place, publisher, year, edition, pages
Institutt for marin teknikk , 2012. , 111 p.
Keyword [no]
ntnudaim:7612, MTMART Marin teknikk, Marin konstruksjonsteknikk
URN: urn:nbn:no:ntnu:diva-18652Local ID: ntnudaim:7612OAI: diva2:566158
Available from: 2012-11-08 Created: 2012-11-08

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