Banca de QUALIFICAÇÃO: MIRELLA LOPES DA ROCHA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : MIRELLA LOPES DA ROCHA
DATA : 30/10/2018
HORA: 15:30
LOCAL: Sala de aulas do PPGCEM
TÍTULO:

Accelerated aging effects on composites used for recovery of pipelines in the oil industry

PALAVRAS-CHAVES:

composites, glass fiber, epoxy resin, oil pipe lines, repair, accelerated aging.

PÁGINAS: 97
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Materiais Conjugados Não-Metálicos
RESUMO:

Pipelines are large-scale structures used in the oil industry to transport fluids, which in turn are corrosive and cause damage to the pipeline structure. In addition to corrosion, there may be design failures, or fabrication, and damage caused by aging. Due to the defects and wear of pipelines, and to the high cost for the implementation of a pipeline, repair with glass fiber reinforced composite material becomes a viable alternative because these materials have high chemical resistance, excellent thermal and mechanical performance and are low cost. However, studies on the durability of such repairs are still needed for greater reliability in their use in the oil industry. Therefore, the objective of this work is to evaluate the durability of the composite material used in the repair of pipelines when subjected to accelerated aging conditions in two environments: saline water and environment with ultraviolet radiation / humidity. The tests performed to evaluate the material were: dynamic-mechanical analysis (DMA), interlaminar shear strength (ILSS), scanning electron microscopy (SEM), permeability test, lap shear and Fourier transform infrared spectroscopy (FTIR). Preliminary results obtained in the DMA showed that for the non-aged composite, a glass transition temperature (Tg) of 72.52 ° C was obtained. Samples submitted to the ILSS test showed a shear strength of 32.25 MPa and in SEM images before and after the ILSS, it was observed that cracks and delamination occurred. The permeability test showed that the permeability coefficient was the most relevant factor. In the lap shear test the maximum force obtained for all samples was relatively low, due to the initial displacement of the central axis of the clamps, which caused an initial detachment of the bonded joints before the application of the load in the test. Finally, FTIR spectroscopy was important to evaluate possible chemical changes in the samples. As future planning, unaged samples and samples aged for periods of 2, 4 and 6 months will be compared and the effect of accelerated aging in these composites will be evaluated.

MEMBROS DA BANCA:
Presidente - 2042234 - ANA PAULA CYSNE BARBOSA
Externo ao Programa - 1064594 - EVANS PAIVA DA COSTA FERREIRA
Interno - 1202134 - JOSE DANIEL DINIZ MELO
Externo à Instituição - LAURA HECKER DE CARVALHO - UFCG