Analysis of anisotropy of time-dependent and nonlinear properties of unidirectional CFRP

Analysis of unidirectional carbon fiber reinforced plastic AS4/3501-6 regularities under strain-rate compression was given. Constitutive equations based on nonlinear hereditary mechanics relationships under shear in plane of the layer were elaborated. In order to obtain the constitutive equations, which are allowing describing the stress-strain curves of unidirectional carbon-fiber reinforced specimens under compression at different angles to the direction of reinforcement in the linear region, the algebra of resolvent operators and the relations of the elasticity theory of an anisotropic body were used. The possibility of correct using of the elaborated approach was shown. (paper)