Analytical Modeling of Creep Behavior of Short Fiber Reinforced Ceramic Matrix Composites

Abstract

This paper studies the high-temperature creep behavior of short-fiber- reinforced ceramic matrix composites. A unidirectional short-fiber composite model under off-axis tension is established and analyzed using a multiaxial creep constitutive relation and an advanced shear-lag method. Both the fiber and matrix are capable of carry ing axial and shear loads, and the fibers also creep at elevated temperatures. Power law be havior is assumed for the fiber and matrix creep constitutive relations under uniaxial load ing. The stress distributions in the fiber and matrix, and the composite creep rate as functions of applied stress have been determined. Parametric studies have been performed for the effects of fiber volume fraction and fiber/matrix interface sliding factor on compos ite creep rate.