Análise de fadiga e corrosão em dutos submarinos

• Autor(a) principal: Gomes Filho, Flávio Ferreira [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155338; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-04-17/000881932.pdf
• topic: Fadiga; Corrosão; Petróleo; Tubos; Fatigue

Oil industry moves billions of dollars every year and is responsible for a big portion of power generation around the world. It's extraction and transport are very sensitive processes, cause any problems may cause big environmental catastrophes. This paper takes base on that to evaluate the resistance of steel tubes used for oil prospection to fatigues stresses caused by vortex-induced vibrations (VIV's) associated to superficial wear caused by corrosion. The study was elaborated by comparing the curve stress versus number of cicles of specimens with and without corrosion, obtained from an API 5CT T95 (1% Cr) pipe. The tests were hold in laboratory and the forced corrosion in salt spray chamber. To complement the results of the fatigue assay, microhardness and surface roughness tests were performed and microestructural analysis made using optical and electron microscopy. As expected, the corroded specimens had an increase on roughness levels and a reduction on fatigue life if compared to the ones without corrosion, mainly in higher tensions. Microroughness and optical microscopy analysis showed that the microstructure of the pipe is anisotropic in longitudinal and transversal ways