Print Email Facebook Twitter A strain energy-based equivalent layer method for the prediction of critical collapse pressure of flexible risers Title A strain energy-based equivalent layer method for the prediction of critical collapse pressure of flexible risers Author Li, X. (TU Delft Transport Engineering and Logistics) Jiang, X. (TU Delft Transport Engineering and Logistics) Hopman, J.J. (TU Delft Ship Design, Production and Operations) Date 2018 Abstract Flexible risers are being required to be installed in a water depth of over 3000 m for fewer remaining easy-to-access oil fields nowadays. Their innermost carcass layers are designed for external pressure resistance since the hydrostatic pressure at such a water depth may cause the collapse failure of flexible risers. Determining a critical collapse pressure for the carcass is of great importance to the whole structural safety of flexible risers. However, the complexity of the carcass profile always makes FE analysis computational intensive. To overcome that problem, the treatment of the interlocked carcass as an equivalent layer is adopted by researchers to accelerate the anti-collapse analyses. This paper presents an equivalent layer method to enable that treatment, which obtains the equivalent properties for the layer through strain energy and membrane stiffness equivalences. The strain energy of the carcass was obtained through FE models and then used in a derived equation set to calculate the geometric and material properties for the equivalent layer. After all the equivalent properties have been determined, the FE model of the equivalent layer was developed to predict the critical pressure of the carcass. The result of prediction was compared with that of the full 3D carcass model as well as the equivalent models that built based on other existing equivalent methods, which showed that the proposed equivalent layer method performs better on predicting the critical pressure of the carcass. Subject CarcassCritical pressureEquivalent layer methodFlexible riserStrain energy To reference this document use: http://resolver.tudelft.nl/uuid:9c87962c-81af-418c-abe1-7043ecfc5133 DOI https://doi.org/10.1016/j.oceaneng.2018.06.042 Embargo date 2018-12-27 ISSN 0029-8018 Source Ocean Engineering, 164, 248-255 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2018 X. Li, X. Jiang, J.J. Hopman Files PDF 1_s2.0_S0029801818310837_main.pdf 2.37 MB Close viewer /islandora/object/uuid:9c87962c-81af-418c-abe1-7043ecfc5133/datastream/OBJ/view