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Determining Elastic Properties from the Dynamic Response of Discontinuous Fiber Composites

REBECCA A. CUTTING, ANTHONY J. FAVALORO, JOHNATHAN E. GOODSELL, R. BYRON PIPES

Abstract


An investigation into the effect of meso-structure variation on the dynamic properties of a plate made from unidirectional pre-impregnated discontinuous carbon fiber platelets was performed. A platelet generation code was implemented to make finite element models of flat plates comprised of platelets with random in-plane orientations. While the mode shapes were not particularly sensitive to orientation changes of the platelets, natural frequency was shown to have a frequency variance similar to a normal distribution for specific modes. Using the orientation tensor developed by Advani and Tucker [1], the local effective elastic properties were calculated and shown to have a correlation with natural frequency shifts. This method could be used in the future to inform modal tap testing results to determine local material properties of discontinuous fiber parts.

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