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research-article

Bonded Flexible Pipe Model Using Macroelements

[+] Author and Article Information
Rodrigo Provasi

University of São Paulo, Department of Structural and Geotechnical Engineering, Avenida Professor Almeida Prado, Trav. 2, No. 83, São Paulo, SP 05508-900, Brazil
provasi@usp.br

Fernando Geremias Toni

University of São Paulo, Department of Mechanical Engineering, Avenida Professor Mello Moraes, No. 2231, São Paulo, SP 05508-900, Brazil
fernando.toni@usp.br

Clovis de Arruda Martins

University of São Paulo, Department of Mechanical Engineering, Avenida Professor Mello Moraes, No. 2231, São Paulo, SP 05508-900, Brazil
cmartins@usp.br

1Corresponding author.

ASME doi:10.1115/1.4039923 History: Received December 28, 2017; Revised April 03, 2018

Abstract

Flexible pipes are structures composed by many layers that vary in composition and shapes. The structural behavior of each layer is defined by the role it must play. The construction of flexible pipes is such that the layers are unbounded, with relative movement between them. Even though this characteristic is what enables its high bending compliant behavior, if the displacements involved are small, a bonded analysis is interesting to grasp the general characteristics of the problem. The bonded hypothesis means that there is no movement relative between layers, which is fine for a small displacement analysis. It also creates a lower bound for the movement, since when considering increasingly friction coefficient values, it tends to the bonded situation. The main advantage of such hypothesis is that the system become linear, leading to fast solving problems (when compared to full frictional analysis) and giving insights to the pipe behavior. The authors have previously developed a finite element based one called macroelements. This model enables a fast-solving problem with less memory consumption when compared to multipurpose software. The reason behind it is the inclusion of physical characteristics of the problem, enabling the reduction in both number of elements and memory used and, since there is less elements and degrees of freedom, faster solved problems. In this article, the advantages of such model are shown by using examples that are representative of a simplified, although realistic, flexible pipe. Comparisons between the macroelement model and commercial software are done to show its capabilities.

Copyright (c) 2018 by ASME
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