The results of an on-going experimental study to characterize the mechanical properties and failure mechanisms of a novel 3-D braided composite of α-alumina fiber (fiber FP) in a matrix of aluminum +2.5% lithium have been presented. Quasi-static tension, compression, and shear tests have been conducted. Acoustic emission data have been collected during tension tests to provide additional information about failure. Fracture toughness and drop-weight impact characteristics have been also evaluated and compared with those of unidirectional FP/aluminum-lithium composites.

The 3-D braiding of fibers not only provides reinforcement in the thickness direction and reduces or eliminates potential for interlaminar failure, but also appears to be an effective approach to increasing the resistance of the composite to crack propagation under both static and impact conditions of loading.