Residual thermal stresses in ceramic composites, Part II: with short fibers

Abstract

The residual thermal stresses in ceramic composites containing short fibers (i.e., fibers of finite length) are analyzed. Whereas the residual stresses in an embedded ellipsoidal inclusion are uniform, the residual stresses in an embedded short fiber are non-uniform. These non-uniform stresses in the fiber are analyzed using a shear lag model. To satisfy the continuity condition at the fiber ends, a technique of assuming imaginary fibers in the composite is adopted in the present study. The predicted residual axial strain along the fiber length is compared with the experimental measurements. Effects of (1) the distance between the fiber end and the free surface of the composite and (2) the aspect ratio of the fiber on the residual stresses are examined.