On the Small Scale Nonlinear Finite Element Analysis of Flexible Risers

Mohammad Rahmati*, Hamid Bahai, Giulio Alfano

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


In this paper an efficient small-scale, detailed finite-element modelling method for flexible risers is presented. The method can be effectively implemented in a fully-nested (FE2 ) multiscale analysis based on computational homogenization. To reduce the computational cost only a small fraction of a flexible pipe is used for a detailed nonlinear finite-element analysis at the small scale by exploiting the cyclic symmetry of the model and applying periodic boundary conditions. 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.
Original languageEnglish
Title of host publicationACME-UK 2016
Subtitle of host publication24th Conference on Computational Mechanics - Proceedings
Number of pages4
Publication statusPublished - 31 Mar 2016
Externally publishedYes
Event24th Conference on Computational Mechanics, UK, Cardiff -
Duration: 31 Mar 20161 Apr 2016


Conference24th Conference on Computational Mechanics, UK, Cardiff


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