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A strain energy-based equivalent layer method for the prediction of critical collapse pressure of flexible risers. / Li, Xiao; Jiang, Xiaoli; Hopman, Hans.

In: Ocean Engineering, Vol. 164, 2018, p. 248-255.

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@article{9c87962c81af418cabe17043ecfc5133,
title = "A strain energy-based equivalent layer method for the prediction of critical collapse pressure of flexible risers",
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.",
keywords = "Carcass, Critical pressure, Equivalent layer method, Flexible riser, Strain energy",
author = "Xiao Li and Xiaoli Jiang and Hans Hopman",
note = "Accepted Author Manuscript",
year = "2018",
doi = "10.1016/j.oceaneng.2018.06.042",
language = "English",
volume = "164",
pages = "248--255",
journal = "Ocean Engineering",
issn = "0029-8018",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - A strain energy-based equivalent layer method for the prediction of critical collapse pressure of flexible risers

AU - Li, Xiao

AU - Jiang, Xiaoli

AU - Hopman, Hans

N1 - Accepted Author Manuscript

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - Carcass

KW - Critical pressure

KW - Equivalent layer method

KW - Flexible riser

KW - Strain energy

UR - http://resolver.tudelft.nl/uuid:9c87962c-81af-418c-abe1-7043ecfc5133

UR - http://www.scopus.com/inward/record.url?scp=85049040177&partnerID=8YFLogxK

U2 - 10.1016/j.oceaneng.2018.06.042

DO - 10.1016/j.oceaneng.2018.06.042

M3 - Article

VL - 164

SP - 248

EP - 255

JO - Ocean Engineering

T2 - Ocean Engineering

JF - Ocean Engineering

SN - 0029-8018

ER -

ID: 46946113