ABSTRACT
Metal matrix composites (MMC) have several inherent properties, such as high stiffness-to-weight ratios and high strength-to-weight ratios, which make them attractive for advanced aerospace applications. These composites also have a higher operating temperature range than polymer matrix composites and most conventional metals. Like polymer composites, MMC are notch sensitive. This chapter reviews some of the experimental and analytical methodology and presents selected results. The micromechanics-based strength prediction methodology combines analytical techniques ranging from a three-dimensional orthotropic finite element model of a notched specimen to a micromechanical model of a single fiber. The chapter describes experimental observations and analytic methodologies for titanium matrix composites. Some work pertaining to boron/aluminum composites is also included. The aluminum matrix work is to illustrate the type of behavior that may be exhibited by a titanium matrix at elevated temperatures where the modulus and yield strength of the titanium are significantly reduced.
