The Fiber/matrix Interfacial Stress On And Beneath The Surface Of Long-fiber-reinforced Composites

Abstract

The numerical and analytical calculation of the fiber/matrix interfacial stress was carried out for a long-fiber-reinforced composite. By using the plane stress and plane strain conditions, the interfacial shear stress distribution was studied on the surface and in the interior of a tensile specimen. It was found that the interfacial shear stress increases with the fiber aspect ratio and decreases with the fiber volume fraction. For small fiber volume fraction, the interfacial debonding will occur preferentially inside the composite. For large fiber volume fraction, the result is reversed. The comparison between numerical results and analytical ones show that neglecting the fiber end stress concentration reduces the interfacial shear stress.