Abstract
An impulse-frequency response vibration technique was employed for determining the shear modulus of glass/epoxy, graphite/epoxy and hybrid (glass-graphite/epoxy) pultruded cylindrical composite rods in torsion. The distribution of the fibers and matrix in the shell-core regions were examined microscopically and the volume fractions of the various constituents determined using the stereology point counting technique. Based on the examined cross-section finite element meshes were generated and analyzed for predicting the shear modulus of such composite rods. It was observed that there was close agreement between the finite element predictions and the experimentally obtained data for only some of the hybrid configurations. The nature of the pultrusion manufacturing process which causes variations in the fiber packing geometry in the shell and core regions of hybrids has been found to significantly influence the accurate prediction of shear modulus, using either analytical or finite element methods.
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