An accurate and computationally efficient small-scale nonlinear FEA of flexible risers

Rahmati, Mohammad, Bahai, Hamid and Alfano, Giulio (2016) An accurate and computationally efficient small-scale nonlinear FEA of flexible risers. Ocean Engineering, 121. pp. 382-391. ISSN 0029-8018

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Official URL: https://doi.org/10.1016/j.oceaneng.2016.05.055

Abstract

This paper presents a highly efficient small-scale, detailed finite-element modelling method for flexible risers which can be effectively implemented in a fully-nested (FE2) multiscale analysis based on computational homogenisation. By exploiting cyclic symmetry and applying periodic boundary conditions, only a small fraction of a flexible pipe is used for a detailed nonlinear finite-element analysis at the small scale. In this model, using three-dimensional elements, all layer components are individually modelled and a surface-to-surface frictional contact model is used to simulate their interaction. The approach is applied on a 5-layered pipe made of inner, outer and intermediate polymer layers and two intermediate armour layers, each made of 40 steel tendons. The capability of the method in capturing the detailed nonlinear effects and the great advantage in terms of significant CPU time saving are demonstrated by comparing the results obtained on elements of pipe of different lengths, equal to one pitch length Lp as well as Lp/5, Lp/20 and Lp/40.

Item Type: Article
Uncontrolled Keywords: Flexible risers, Frictional contact, Periodic boundary condition, FE modelling
Subjects: H100 General Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Becky Skoyles
Date Deposited: 12 Nov 2018 14:49
Last Modified: 12 Oct 2019 11:21
URI: http://nrl.northumbria.ac.uk/id/eprint/36623

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