Micromechanical investigation of an optical fiber embedded in a laminated composite

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Abstract
A linear elastic study is performed as a first order approximation to investigate the geometry of the resin-rich region observed around optical fibers embedded in laminated composites. The Rayleigh-Ritz method is employed with beam bending functions as assumed trial functions. The total potential energy is formulated in terms of unknown force distributions and the length of the resin pocket. The resulting system of coupled nonlinear equations is solved by the Levenberg-Marquardt algorithm to compute the shape and size of the resin pocket. Results of this analysis show the effect of laminate stacking sequence on the geometry of the resin pocket and are found to agree well with experimental observations.The computed geometry is automatically discretized for FEM analysis in order to obtain stress intensity information at the lateral ends of the resin pocket.

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