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Transfer molding of axisymmetric bodies with fiber-reinforced molding compounds through gates coincident with the geometric axis of revolution (z) results in fiber orientation distributions which may also be independent of tangential position (ϑ). In the present study, the thermoelastic response of the annular disk is correlated with analytic, numerical integration and finite-element predictions. Methodology based upon microscopic examination of the disk fiber orientation distribution is presented for the material property characterization required by the various solution techniques. Correlation with experimental results indicates that all three techniques adequately predict the in-plane deformation and strain response of the cylindrically orthotropic disk. The approximate elasticity solution of the layered fiber orientation distribution obtained by the finite-element method reveals an interlaminar stress state at tractionfree surfaces which decays within one disk thickness. Consequently, the analytical and numerical integration techniques which assume homogeneity through the disk thickness are not applicable for stress calculations in the vicinity of the free edges.
transfer molding, short fiber thermosets, process-induced fiber orientation, cylindrically orthotropic, thermoelastic material properties, interlaminar stress
Associate scientist, University of Delaware, Newark, DE
professor and director, University of Delaware, Newark, DE