A Parametric Study on the Influence of Imperfections on Pipe Mechanical Response During Bending in Reel-Lay Installation Using Finite Element Method

2014 ◽  
Author(s):  
Ali A. Dawood ◽  
S. Kenny
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Modelling ◽  
Mechanical Response ◽  
Material Strength ◽  
Element Modelling ◽  
Strain Discontinuity ◽  
Deformation Stress ◽  
Future Work ◽  
Joint Material

Finite element modelling procedures were developed to examine the effect of pipe diameter, ovality, wall thickness, imperfection formulations, joint-to-joint material strength variation and radial weld offset on the pipe mechanical response through numerical simulation of the reeling process. This study examines the pipe deformation, stress concentration, and strain discontinuity developed during simulation of the pipe reeling process. The key parameters influencing the pipe mechanical response are identified and recommendations on future work provided.

Offshore pipelines and ice gouge geohazards: comparative performance assessment of decoupled structural and coupled continuum models

2016 ◽  
Vol 53 (11) ◽  
pp. 1866-1881 ◽  
Author(s):  
Kenton Pike ◽  
Shawn Kenny
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Modelling ◽  
Physical Modelling ◽  
Parameter Analysis ◽  
Comparative Performance ◽  
Offshore Pipelines ◽  
Element Modelling ◽  
Simulation Tools ◽  
Reference Framework

Offshore pipelines in ice environments may be subjected to unique geohazards such as seabed ice gouging. These events involve nonlinear processes including large deformations and strains, contact mechanics, and failure mechanisms. Current pipeline engineering design practice employs decoupled, structural finite element modelling procedures to assess system demand and capacity. The inherent error and uncertainty within this approach drives conservative engineered solutions. Physical modelling and continuum numerical simulation tools complement this engineering framework to improve confidence in predicted outcomes. The relative performance of engineering models, used in current practice, and numerical simulation tools, including structural and continuum finite element modelling procedures, to predict the deformation and strain response of a buried pipeline subjected to an ice gouge event is examined. Refinements to the numerical modeling procedures and establishment of a consistent and compatible reference framework for the performance evaluation differentiate this study from others, which are subsets of the current investigation. For the parameter analysis conducted, within an equivalent reference framework, the outcomes demonstrate key factors, including superposition error and directional load decoupling, that influence model error that may not be as significant as previously considered. The scope and extent of this outcome is not fully understood and requires further investigations to delineate the significance across a wider parameter range.

scholarly journals DEFORMATION OF FE3SI SINGLE-CRYSTALS UNDER NANOINDENTATION

2018 ◽  
Vol 17 ◽  
pp. 1
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Aleš Materna
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Single Crystals ◽  
Deformation Behavior ◽  
Finite Element Modelling ◽  
Mechanical Response ◽  
Materials Science ◽  
Element Model ◽  
Complex Deformation ◽  
Element Modelling

Knowledge of the complex deformation behavior in the anisotropic materials is one of essential issues in materials science and it is crucial for the applications of a given material. In this study, mechanical response of Fe3(wt.%)Si single crystal to nanoindentation with spherical indenter was investigated. Hardness and indentation Young´s modulus were determined experimentally and by finite element modelling. Observed pop-in phenomenon, shape of the residual imprints and origin of the slip lines were explained on the basis of resolved shear stress computed by finite element model.

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