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The objective of this paper is to demonstrate the effects of hybridization on the static and dynamic behavior of pultruded composite rods subjected to a torsional mode of deformation. Candidate materials that were tested included cylindrical composites made from unidirectional glass and graphite fibers, and hybrids of glass-graphite/epoxy in various shell-core type configurations, fabricated by the pultrusion manufacturing process. The dynamic torsional stiffness and damping were evaluated by the FFT based impulse-frequency response vibration technique. The static shear modulus was obtained using a conventional low torque tester and the initial tangent modulus method. This study has shown that for a given fiber volume fraction glass/epoxy exhibits higher shear modulus than graphite/epoxy; and hybridization of these two material systems results in better dynamic performance by placing glass fibers in the outer shell region.

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