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On the multi-scale computation of un-bonded flexible risers

Bahtui, A ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.engstruct.2010.04.003
  3. Publisher: 2010
  4. Abstract:
  5. The purpose of this paper is to model the detailed effects of interactions that take place between components of un-bonded flexible risers, and to study the three-dimensional motion responses of risers when subjected to axial loads, bending moments, and internal and external pressures. A constitutive law for un-bonded flexible risers is proposed and a procedure for the identification of the related input parameters is developed using a multi-scale approach. A generalized finite element structural model based on the Euler-Bernoulli beam theory is developed in which the constitutive law is embedded. The beam theory is enhanced by the addition of suitable pressure terms to the generalized stresses to account for the internal and external pressures, and it can therefore be efficiently used for large-scale analyses. The developed nonlinear relationship between generalized stresses and strains in the beam is based on the analogy between frictional slipping between different layers of a flexible riser and frictional slipping between micro-planes of a continuum medium in non-associative elasto-plasticity. The merit of the present constitutive law lies in its ability to capture many important aspects of the structural response of risers, including the energy dissipation due to frictional slip between layers and the hysteresis response
  6. Keywords:
  7. Frictional slipping ; Generalized finite-element formulation ; Large-displacements ; Non-associative plasticity ; Parameter identification ; Associative plasticity ; Beam theories ; Constitutive law ; Continuum medium ; Euler Bernoulli beam theory ; External pressures ; Finite Element ; Finite element formulations ; Flexible risers ; Frictional slip ; Hysteresis response ; Input parameter ; Large-scale analysis ; Multi-scale approaches ; Multiscales ; Non-linear relationships ; Structural models ; Structural response ; Three-dimensional motion ; Bending (deformation) ; Elasticity ; Energy dissipation ; Finite element method ; Friction ; Marine risers ; Model structures ; Plasticity ; Three dimensional ; Parameter estimation ; Constitutive equation ; Displacement ; Elastoplasticity ; Hysteresis ; Loading test ; Riser ; Three-dimensional modeling
  8. Source: Engineering Structures ; Volume 32, Issue 8 , August , 2010 , Pages 2287-2299 ; 01410296 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0141029610001264