Carbon nanofibers enhance the fracture toughness and fatigue performance of a structural epoxy system |
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Authors: | Daniel R. BortzCé sar Merino,Ignacio Martin-Gullon |
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Affiliation: | a Department of Chemical Engineering, University of Alicante, Alicante, Spain b Grupo Antolín Ingeniería, Crta Irún 244, Burgos, Spain |
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Abstract: | This study investigates the monotonic and dynamic fracture characteristics of a discontinuous fiber reinforced polymer matrix. Specifically, small amounts (0-1 wt.%) of a helical-ribbon carbon nanofiber (CNF) were added to an amine cured epoxy system. The resulting nanocomposites were tested to failure in two modes of testing; Mode I fracture toughness and constant amplitude of stress tension-tension fatigue. Fracture toughness testing revealed that adding 0.5 and 1.0 wt.% CNFs to the epoxy matrix enhanced the resistance to fracture by 66% and 78%, respectively. Fatigue testing at 20 MPa peak stress showed a median increase in fatigue life of 180% and 365% over the control by the addition of 0.5 and 1.0 wt.% CNF, respectively. These results clearly demonstrate the addition of small weight fractions of CNFs to significantly enhance the monotonic fracture behavior and long-term fatigue performance of this polymer. A discussion is presented linking the two behaviors indicating their interdependence and reliance upon the stress intensity factor, K. |
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Keywords: | A. Nano composites A. Carbon nanotubes A. Polymer matrix composites (PMCs) B. Fatigue B. Fracture toughness |
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