A composite sample of carbon reinforced epoxy has dimensions of 12 in by 12 in by 0.25 in and mass of 1.8 lb. The carbon fibers have a modulus of elas
A composite sample of carbon reinforced epoxy has dimensions of 12 in by 12 in by 0.25 in and mass of 1.8 lb. The carbon fibers have a modulus of elasticity of 50(106 ) lb/in2 and a density of 0.069 lb/in3 . The epoxy matrix has modulus of elasticity of 0.61(106 ) lb/in2 and a density of 0.042 lb/in3 . What is the volume fraction of (a) the carbon fibers and (b) the epoxy matrix in the sample? Assume there are no voids in the sample.