Analytical Study of Two Pin Loaded Holes in Unidirectional Fiber Reinforced Composites

Abstract

The objective of this paper is to investigate the effects of geometrical parameters such as the edge distancetohole diameter ratio {e/d}, plate widthtohole diameter ratio {w/d}, and the distance between two holestohole diameter ratio {l/d} on stress distribution in a unidirectional composite laminate with two serial pinloaded holes, analytically and numerically. It is assumed that all short and long fibers lie in one direction while loaded by a force po at infinity. To derive differential equations based on a shear lag model, a hexagonal fiberarray model is considered. The resulting pin loads on composite plate are modeled through a series of spring elements accounting for pin elasticity. The analytical solutions are, moreover, compared with the detailed 3D finite element values. A close match is observed between the two methods. The presence of the pins on shear stress distribution in the laminate is also examined for various pin diameters.