Carbon Nanofibers enhance the Fracture toughness and Fatigue Performance of a Structural Epoxy system
Résumé
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% CNFsto 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, .
Fichier principal
PEER_stage2_10.1016%2Fj.compscitech.2010.09.015.pdf (1.09 Mo)
Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...