Effect of processing on the dynamic behavior and material failure in hybrid composites

The evolution of hybrid composite materials with the inclusion of nano-particulate material components in conventional fiber reinforced composites has shown changes in its mechanical behavior. Processing techniques that involve engrafting particulate materials in the matrix phase and fiber phase are variants used in the fabrication of these hybrid composite materials. Matrix and fiber modification with particulates induce changes in the phase interactions of the components, leading to changes in the mechanical behavior of the hybridized composite material system. These hybrid composites show multi-mode failure and is largely reflected in the failure mechanics under structural loading. In the present study, epoxy resin and bi-directional (0/90) weave S2 fiberglass are primary components of the material system. Particulate reinforcement used is 110nm alumina nano-particles. Particulate reinforcements are chemically modified for compatibility to the primary components by treatment with silane coupling agents. The mechanical behavior of the epoxy/fiberglass/ alumina hybrid composite is investigated based on a damage mechanics evaluation of its failure. The performance was evaluated via modulus degradation, crack and interface damage characterization under low cycle fatigue loading. Comparative studies of the mode I fracture toughness of the materials are also discussed. The dynamic and failure behavior indicate a correlation to the processing methodology, and functionalization that were employed during the processing.