Desenvolvimento e implementação de algoritmo para análise de dutos fabricados ou reparados com material compósito carregados com pressão interna utilizando o método dos elementos finitos.

Abstract

Nowadays the integrity of pipelines gets even more important as a result of the industry growth and strong enviromental requirements. An important ally in the maintenance of the integrity is the repair with composite materials. These materials have low specific gravity, repair can be done at low temperatures and they can orientate the main resistence according to the load. The goal of this work is to develop and inplement an algorithm that allows the assessment of loads and strength in the pipes loaded with internal pressure manufactured or repaired with composite laminates using the finite element method. Among the advantages of the own software development there are agility for the assessment , lower cost with software licence, lower computational demands, possibility of developing the software and a better understanding of the modeling of the fenomena. The inputs of the software are the diameter of the pipe, internal pressure and parameters of the composite laminate. The finite element analysis is constructed according to the classical laminate theory. After the loads resulting of the internal pressure are applied, the displacements are calculated and then the stresses and Tsai-Hill failure criteria are determined for each layer. Experimental and numerical studies were simulated with the developed software and the results for the laminae properties, pipe stress and the failure pressure are in agreement with the results found in the review. The software is modified in order to end the failure pressure to show the versatility of the algorithm. We conclude that the algorithm allows a fast assessment of the strenght of pipeline repair and the changes in the answer of the pipe when the repair parameters are changed.