Houston, TX, United States
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Withers G.J.,Milliken Pipe Wrap | Souza J.M.,Milliken Pipe Wrap | Yu Y.,Milliken Pipe Wrap | Cercone L.,Milliken Pipe Wrap | And 2 more authors.
Journal of Composite Materials | Year: 2016

The mechanical properties of a water-activated polyurethane-glass fiber composite reinforced using amino-functionalized carbon nanofibers are evaluated for ultimate tensile strength, Young's modulus, ductility and fatigue life at 60°. The amino-functionalized carbon nanofibers are dispersed in the water-activated polyurethane matrix at 0.4 weight percent (wt%) with respect to the glass fabric for comparison with the neat (or 0.0 wt% amino-functionalized carbon nanofibers) water-activated polyurethane-glass fiber composite material. Fatigue tests were performed at a stress-ratio (R-ratio) = +0.9. This cyclic loading level and temperature conditions would simulate a vibro-creep-fatigue type loading and response condition. The results showed that the water-activated polyurethane-glass fiber composite when reinforced with amino-functionalized carbon nanofibers (amino-functionalized carbon nanofibers water-activated polyurethane-glass fiber nanocomposite) had improved tensile strength, ductility and fatigue life properties in comparison to the neat composite, but there was a reduction in Young's modulus in this nanocomposite material at high applied load levels. This amino-functionalized carbon nanofibers water-activated polyurethane-glass fiber nanocomposite could have worldwide applications for external surface repair or rehabilitation on existing civil-mechanical structures such as concrete or metal pilings, vessels and piping, to achieve an extended operational life under elevated temperatures and fatigue-type loading conditions. © SAGE Publications.


Withers G.J.,Milliken Pipe Wrap | Yu Y.,Milliken Pipe Wrap | Khabashesku V.N.,University of Houston | Cercone L.,Milliken Pipe Wrap | And 3 more authors.
Composites Part B: Engineering | Year: 2014

An organomodified surface nanoclay reinforced epoxy glass-fiber composite is evaluated for properties of mechanical strength, stiffness, ductility and fatigue life, and compared with the pristine or epoxy glass-fiber composite material not reinforced with nanoclays. The results from monotonic tensile tests of the nanoclay reinforced composite material at 60°C in air showed an average 11.7% improvement in the ultimate tensile strength, 10.6% improvement in tensile modulus, and 10.5% improvement in tensile ductility vs. these mechanical properties obtained for the pristine material. From tension-tension fatigue tests at a stress-ratio=+0.9 and at 60°C in air, the nanoclay reinforced composite had a 7.9% greater fatigue strength and a fatigue life over a decade longer or 1000% greater than the pristine composite when extrapolated to 109 cycles or a simulated 10-year cyclic life. Electron microscopy and Raman spectroscopy of the fracture and failure modes of the test specimens were used to support the results and conclusions. This nanocomposite could be used as a new and improved material for repair or rehabilitation of external surface wall corrosion or physical damage on piping and vessels found in petrochemical process plants and facilities to extend their operational life. © 2014 Elsevier Ltd.


Withers G.J.,Milliken Pipe Wrap | Yu Y.,Milliken Pipe Wrap | Khabashesku V.N.,University of Houston | Cercone L.,Milliken Pipe Wrap | And 4 more authors.
Composites Part B: Engineering | Year: 2015

An organomodified surface nanoclay reinforced epoxy glass-fiber composite is evaluated for properties of mechanical strength, stiffness, ductility and fatigue life, and compared with the pristine or epoxy glass-fiber composite material not reinforced with nanoclays. The results from monotonic tensile tests of the nanoclay reinforced composite material at 60°C in air showed an average 11.7% improvement in the ultimate tensile strength, 10.6% improvement in tensile modulus, and 10.5% improvement in tensile ductility vs. these mechanical properties obtained for the pristine material. From tension-tension fatigue tests at a stress-ratio = +0.9 and at 60°C in air, the nanoclay reinforced composite had a 7.9% greater fatigue strength and a fatigue life over a decade longer or 1000% greater than the pristine composite when extrapolated to 109 cycles or a simulated 10-year cyclic life. Electron microscopy and Raman spectroscopy of the fracture and failure modes of the test specimens were used to support the results and conclusions. This nanocomposite could be used as a new and improved material for repair or rehabilitation of external surface wall corrosion or physical damage on piping and vessels found in petrochemical process plants and facilities to extend their operational life. © 2014 Elsevier Ltd. All rights reserved.

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