Meso-mechanical analysis on dynamic viscoelasticity of fiber-reinforced composites

Dynamic approaches for viscoelasticity of fiber-reinforced composites were pursued in this study.Firstly,an isotropic viscoelastic constitution was built to describe the time-dependent properties of epoxy matrix phase in composites.The parameters in the model were determined from creep experiment of pure epoxy.Then,transverse isotropic and orthogonal viscoelastic models were developed to represent the time-dependent behaviors of unidirectional composites and orthogonal layered laminates,respectively.Static and dynamic experiments for the mentioned composites were carried out.The predicted damping ratio,dynamic storage modulus,loss modulus and loss factor are all in good agreement with experimental results.