Evaluation of the mechanical performance of the creep behavior of a fiberglass repair after aging in oil
- 46 Downloads
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).
- 1.Hsu TM, Skogsberg J, Karayaka M (2001) Composites utilization on a spar platform—potential economic impact and technical gaps. In: Wang SS, Willians JG, Lo KH (eds) Composite materials for offshore operations, vol 3. University of Houston, CEAC Publishing, Houston, pp 19–43Google Scholar
- 2.Hota G, Liang R (2011) Advanced fiber reinforced polymer composites for sustainable civil infrastructures. In: International symposium on innovation & sustainability of structures in civil engineering, Xiamen University, China, 28–30 OctGoogle Scholar
- 9.Law ACK (2007) Creep deformation and thermal aging of random glass-mat polypropylene composite. Master thesis, University of Waterloo, Ontario, CanadaGoogle Scholar
- 11.Hoppel CRP, Bogetti TA, Gillespie JW Jr. (1995) Effects of hydrostatic pressure on the mechanical behavior of composite materials. ARL-TR-727 Report, U.S. Army Research Laboratory, Aberdeen Proving Ground, MD, USAGoogle Scholar
- 21.Stern S, Dierdorf D (2005) Thermogravimetric analysis (TGA) of various epoxy composite formulations. Air Force Research Laboratory, Report 2005-4585, Tyndall AFB, FLGoogle Scholar
- 22.May CA (1987) Epoxy resins. In: Reinhart TJ (ed) Engineered materials handbook, vol 1. Composites. ASM International, Materials Park, pp 66–77Google Scholar