Evaluation of the mechanical performance of the creep behavior of a fiberglass repair after aging in oil
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The mechanical behavior of a glass fiber/epoxy matrix composite used to repair steel pipes was evaluated after its exposure to oil under temperature at atmospheric pressure and at 17 bar. The effect of pressure was found to affect on a different way short-term and long-term properties of the composite. Under atmospheric pressure, more oil was absorbed by the composite than at 17 bar. This behavior was attributed to the effect of the hydrostatic pressure upon the polymeric matrix-free volume. The set of mechanical properties evaluated by tree-point bending test (flexural strength, elastic modulus, toughness, and deformation at maximum load) was also more affected when aging was conducted under atmospheric pressure. However, the steady state creep rate of the composite aged under 17 bar was higher than that of the material aged at atmospheric pressure, reducing the expected service life of the repair joint when both temperature and pressure are applied together.
KeywordsFiberglass repair Aging Oil absorption Creep
The authors acknowledge the financial support from the Brazilian Agency Conselho Nacional de Desenvolvimento e Pesquisa (CNPq).
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