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A mathematic model is proposed for predicting the dynamic properties of fiber reinforced plastic composites(FRP) with interphase. Dynamic properties mainly include loss factors and elastic moduli. The results of elastic moduli from the present model are compared with other models. Elastic moduli E11, E22, G12, G23 and loss factors η11, η22, η12 and η23 of FRP are calculated and a study of the effect of elastic modulus EIand loss factor ηI of interphase on dynamic properties in FRP is carried out here. In this paper, E11 linearly increases with EI, but the growth rate is slow. E22, G12, G23 increase rapidly for lower value of EI. The longitudinal loss factor g11 decreases with the increase of EIin the case of ηI< 0.0026. But η11 linearly increases with EIin larger range of ηI, ηI≥ 0.0026. On the contrary, transverse loss factor η22, transverse shear loss factors η23 and longitudinal shear loss factors η12 increase with increase of EIin the case of lower value of ηI, but decreases at larger value of gI. And they also show insensitivity to EIat higher value.
A mathematic model is proposed for predicting the dynamic properties of fiber reinforced plastic composites (FRP) with interphase. Dynamic properties primarily include loss factors and elastic moduli. The results of elastic moduli from the present model are compared with other models. Elastic moduli E11, E22, G12, G23 and loss factors η11, η22, η12 and η23 of FRP are calculated and a study of the effect of elastic modulus EI and loss factor ηI of interphase on dynamic properties in FRP is carried out here. increases with EI, but the growth rate is slow. E22, G12, G23 increase rapidly for lower value of EI. The longitudinal loss factor g11 decreases with the increase of EIin the case of ηI <0.0026. of ηI, ηI ≥ 0.0026. On the contrary, transverse loss factor η22, transverse shear loss factors η23 and longitudinal shear loss factors η12 increase with increase of EIin the case of lower value of ηI, but d ecreases at greater value of gI. And they also show insensitivity to EIat higher value.