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Master's Dissertation
DOI
10.11606/D.3.2016.tde-22062016-163310
Document
Author
Full name
William Corrêa Guttner
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Pesce, Celso Pupo (President)
Gay Neto, Alfredo
Tanaka, Rafael Loureiro
Title in Portuguese
Modelo tridimensional em elementos finitos para a análise de cabo umbilical STU submetido ao carregamento de crushing.
Keywords in Portuguese
Cabos umbilicais
Estruturas (Análise)
Estruturas offshore
Método dos elementos finitos
Abstract in Portuguese
Este trabalho desenvolve e apresenta um modelo tridimensional em elementos finitos de um cabo umbilical do tipo STU (Steel Tube Umbilical) utilizado na extração offshore de petróleo. Tal modelo é utilizado para estudar o carregamento de crushing, que é imposto ao cabo umbilical pelas sapatas do tensionador durante o seu lançamento, de modo a obter de forma detalhada a distribuição de tensões nos componentes do núcleo, com foco nos tubos de aço utilizados para o transporte de fluidos. A metodologia empregada no desenvolvimento do modelo é descrita detalhadamente ao longo do trabalho, de forma que possa vir a ser utilizada no estudo de outras configurações de cabos umbilicais. O modelo elaborado é utilizado (i) como paradigma para a validação de um modelo bidimensional, que visa analisar o mesmo problema de forma mais simples e rápida, e (ii) para o estudo do comportamento das tensões nos tubos de aço na região de transição de entrada/saída da sapata. Na comparação entre os modelos bi e tridimensional, o trabalho conclui pela validade do modelo bidimensional na avaliação das tensões nos tubos de aço resultantes do carregamento de crushing, na região central do cabo. O estudo realizado na região de transição de entrada/saída da sapata permitiu verificar que ocorre um aumento dos níveis de tensão nos tubos de aço nessas regiões de transição, com redistribuição do campo de tensões após plastificação.
Title in English
Three-dimensional finite element model for the analysis of STU umbilical cable subjected to crushing load.
Keywords in English
Finite element method
Offshore mechanics
Structural analysis
Umbical cables
Abstract in English
This project proposes a three-dimensional finite element model of a Steel Tube Umbilical Cable used in the offshore oil extraction. This model is used to study the crushing load imposed to the cable by the shoes of the tensioner during its installation, in order to obtain a detailed distribution of stresses in the components of the core, focusing on the steel tubes used for fluid transportation. The methodology employed in the development of the model will be fully described throughout the study, allowing to reproduce it in the analysis of different umbilical configurations. The developed model is used (i) as a paradigm for the validation of a two-dimensional model, which aims to analyze the same problem in an easier and faster manner, and (ii) to study the behavior of the stresses in the steel tubes in the entry/exit transition region of the shoe. Comparison between the two and three-dimensional models allows to conclude for the validity of the two-dimensional in evaluating the stresses in the steel tube resulting from the crushing load, in the central region of the cable. The study performed in the entry/exit transition region of the shoe has enabled do verify that there is an increase of the stress levels in the steel tubes in these transition regions, with field stress redistribution after plastification.
 
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Publishing Date
2016-06-23
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • Guttner, William C., and Pesce, Celso P. On Hamilton?s principle for discrete systems of variable mass and the corresponding Lagrange?s equations [doi:10.1007/s40430-016-0625-4]. Journal of the Brazilian Society of Mechanical Sciences and Engineering [online], 2016, vol. online, p. 1-8.
All rights of the thesis/dissertation are from the authors
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