A computational study of the effect of microstructure of hybrid carbon/glass fiber composites on their
strength is presented. Unit cells with hundreds of randomly located and misaligned fibers of various
properties and arrangements are subject to tensile and compression loading, and the evolution of fiber
damages is analyzed in numerical experiments. The effects of fiber clustering, matrix properties, nanoreinforcement,
load sharing rules on the strength and damage resistance of composites are studied. It was
observed that hybrid composites under uniform displacement loading might have lower strength than
pure composites, while the strength of hybrid composites under inform force loading increases steadily
with increasing the volume content of carbon fibers