Abstract
The service life of advanced ceramic composites under creep-rupture conditions was estimated by investigating the high temperature microcrackgrowth behavior along a planar interface between two elastic dissimilar media. The crack was assumed to grow along the interface normal to a remotely applied tensile stress via a coupled surface and grain boundary diffusion under steady creep conditions. The governing integro-differential equation containing the unknown tensile distribution was derived and it was found that a new length parameter exists as a scaling factor for the interface for which the solution becomes identical to the single phase media when plotted on the nondimensional physical plane.