Published: Jan 1991
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A McLean-Anderson experimental design for mixtures was used to design formulations for an automotive grade sheet molding compound (SMC). With the use of the Scheffe special cubic model, a predictive equation has been calculated to predict the coefficient of linear thermal expansion (CLTE) for an automotive grade SMC. The experimentally designed formulations included four control factors: resin, initiator, filler, and glass. The range levels were chosen based on the criteria for an automotive grade SMC. CLTE predicted values versus observed values have residuals ranging from 0.03 to 14.9% deviation based on four test formulations. Qualitative predictions were determined based on experimental work from various types of resin and glass.
sheet molding compound, coefficient of linear thermal expansion, composites, anisotropy, experimental design, thermomechanical analysis
Research and development chemist, Premix, Inc., Research and Development, North Kingsville, OH