Estudo do fator de forma de área em reparo com chapa colada em tubulações com furo

Abstract

In this work, the resistance to hydrostatic pressure of repair with steel plate low carbon, glued with structural adhesive epoxy in the steel pipes with hole was investigated. Thin-wall pipes under internal pressure, the tension in the longitudinal direction is half the circumferential stress the pipe, thus the shape factor of repair area, that is, the change of the plate size in the longitudinal and circumferential directions tube was evaluated. The influence of repair failure strength when vary the size of the plate in the mentioned directions, were statistically analyzed using a factorial experiments desing. High values of the hydrostatic resistance in the repair were found (around 240 bar) compared with the normal working pressure (around 70 bar) in a similar pipe used in the tests. The results of repair failure pressure of the 10 groups analyzed small standard deviations, less than 12%, demonstrating the efficiency of the procedures adopted in the bonding mechanism. The study demonstrated of any existence of the form factor in the repair resistance due to variation in the dimensions of the plate in the longitudinal and circumferential direction, even as the high influence in the repair resistance with the increase from the area plate. The results point to the development of a new contingency repair procedure.