Strain-rate effect on mechanical behavior of unidirectional carbon fiber reinforced plastic

Abstract

Abstract To form the constitutive equations for a unidirectional carbon fiber reinforced plastic, the hereditary elastic medium constitutive relations, the anisotropic theory of elasticity and the Volterra correspondence principle are used. Based on the proposed model applied to describe the compression stress-strain curves of the unidirectional IM7/8552 composite with various off-axis angles, an attempt is made to take into account the strain rate effect on the stress-strain curves. Experimental data analysis shows that rheological and physically nonlinear properties distinctly appear along with the anisotropy of elastic properties. Computational algorithm implementation becomes possible due to using the relations of the algebra of weakly singular resolvent operators. The experimental data of the unidirectional IM7/8552 and AS4/3501-6 composites under off-axis loading with various strain rates are analyzed.