Stress distribution analysis and interface influence on fiber reinforced composites

Abstract

In this paper, Eshelby's equivalent inclusion theory, Mori-Tanaka method and shear lag theory are used to derive the analytical formula of stress distribution on the fiber. The effective elastic modulus of the equivalent fiber combining the fiber and the interface layer is predicted and analyzed. Moreover, the theoretical expression of stress field on fibers under three-phase structure is proposed, and the factors affecting the stress distribution on the fiber are also discussed. In addition, because the mechanical properties of different interface layers will have an impact on the parameters of the equivalent fiber phase, this study considers the influence of different interface properties on the interface stress ability, and the effect of interface properties on stress transfer is also investigated. It is proved that the effect of interface layer on stress transfer between matrix and fiber can not be neglected.