Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
STRESS ANALYSIS VIA FINITE ELEMENTS IN STRAIGHT AND CURVED PIPELINES CONTAINING DENT DEFECTS
Submission Author:
Maize Cibele de Lima Melo , RN
Co-Authors:
Maize Cibele de Lima Melo, Paulo Roberto Maciel Lyra, Ramiro Willmersdorf, juliana torres , Adriano Dayvson Marques Ferreira
Presenter: Maize Cibele de Lima Melo
doi://10.26678/ABCM.COBEM2023.COB2023-2002
Abstract
The present work aims to evaluate how dents defects influence the structural integrity of straight and curved pipelines. Pipelines play a fundamental role in the transportation of fluids over long distances, indispensable in the energy industries, specifically the oil and gas industry. Most of the pipeline network is underground, and its integrity is affected by mechanical defects caused by corrosion and dents. Dents defects induce stress concentration that has been the cause of a significant number of pipeline failures. The structural arrangement of these pipelines depends on the employability and infrastructure available in the operations, sometimes rigid pipelines must be able to overcome topological obstacles, therefore bending of these pipelines may be necessary, and they also may be subject to mechanical damage. This study proposes a computational methodology to evaluate the integrity of pipelines with dent defects. It is based on the generate computational models with the finite element method (FEM), using Ansys software. The FE model verification in the present work was done through comparison with results already obtained in the literature for straight section rigid pipelines, which presents validation of the numerical model based on experimental data. The present work extends the approach to curved pipelines, aiming to evaluate the influence of the curvature on the mechanical behavior of the pipeline with respect to the dents defect. The defects are produced synthetically, through a non-linear contact analysis, using a spherical punch as the indentor. To ensure the quality of the result, self-adaptive mesh refinement was used in the computer simulations. The results show the influence of the defect, proving how dent defects induce stress concentration that compromises the integrity of pipelines, especially in cases of curved pipelines where there are residual stresses due to the forming process even before the defect is present.
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