In the present paper, viscoplastic property of epoxy resin reinforced by carbon nanotube (CNT) is investigated by numerical approach based on finite element method (FEM) and homogenization theory. Homogenization theory is employed to estimate the homogenized elastic moduli of the composite material which consists of matrix resin and carbon nanotubes. Viscoplastic constitutive equation of epoxy resin have been estimated by uni-axial tensile tests under several strain rates. The parameter of approximation equation of the constitutive equation for epoxy resin was identified based on J2 flow theory. The stress-strain relation under constant strain rate can be identified by the viscoplastic property of epoxy resin and elastic moduli of CNT, where finite element method and homogenization theory were applied. The effect of strain rate, volume fraction of fiber for the viscoplastic property of epoxy resin reinforced with CNT was clarified by some numerical demonstration using the present approach.
