Induction Heating of Carbon-Fiber Composites: Electrical Potential Distribution Model.
Final rept. Dec 94-Mar 96
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Mechanisms of heat generation and distribution in carbon-fiber-based composites subjected to an alternating magnetic field are considered. A model that predicts the strength and distribution of these heat sources in the plane of the cross-ply laminate configurations has been developed and verified. In this analysis, the fibers in a cross-ply pair are treated as a grid of conductive loops in the plane. Each such conductive loop uses the alternating magnetic field to produce a rotational electromotive force that induces electric fields in the polymeric regions. Induced electromagnetic energy is converted into thermal energy through dielectric losses in polymeric regions between the carbon fibers in the adjacent orthogonal plies that the conductive loops comprise. Each possible conductive loop is accounted for, and the resulting superposition of potential differences at the nodes leads to the in-plane profile of the electric field in the polymeric regions. Data from AS4 graphite-reinforced polyetheretherketone PEEK laminate surface temperature measurements using liquid crystal sheets compare qualitatively with the theory.
- Electrical and Electronic Equipment
- Laminates and Composite Materials