ABSTRACT
The fiber-matrix interface is a critical constituent of composites because load transfer from the matrix to the high-modulus fiber and vice versa must occur through the interface. It is this load transfer behavior that distinguishes composites from monolithic materials. This chapter considers two special examples initially to emphasize how interface characteristics can influence composite performance. Additional details of the effects of interface properties on composite response are also provided later. The chapter illustrates some of the important issues, to emphasize its role on MMC response and life prediction, and to provide a background for developing interfaces for optimized MMC performance. The usefulness of fracture toughness as an interface characterizing parameter is especially appealing when one considers the nonuniform stress distribution at the interface.
