Stress Distribution of Aligned Short-Fiber Composites under Axial Load

摘要

The objective of this paper is to investigate the normal and interfacial shear stress distribution of short-fiber composites under a force either parallel to the fiber or making some angle with the fiber. Different geometrical shapes of fiber end were taken into account. The geometrical shapes under investigations were: rectangular, semi-circular, V-shaped and wedge-shaped respectively. Analytical solutions of this problem were achieved by using finite-element numerical scheme. Numerical results of normalized stress sigma sub f and shear stress tau were plotted as a function of the coordinate along the fiber direction. It was observed that, the distributions of sigma sub f and tau were in good agreement with existing results obtained experimentally by using photoelasticity method. It was also observed that shear stress concentration is very high near the fiber tip. This phenomenon is particularly true for wedge and V-shaped fiber ends. A possible application of this investigation is to optimize internal damping of short-fiber composites by properly adjusting fiber end geometry.