<i>In situ</i> sensor monitoring and intelligent control of the resin transfer molding process

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<jats:title>Abstract</jats:title><jats:p>An intelligent closed‐loop expert control system has been developed for automated control of the resin transfer molding process of a graphite fiber preform using an epoxy resin, E905L. The sensor model system has been developed to make intelligent decisions based on the achievement of landmarks in the cure process, such as full preform impregnation, the viscosity, and the degree of cure of the resin rather than time or temperature. <jats:italic>In</jats:italic>‐<jats:italic>situ</jats:italic> frequency dependent electromagnetic sensor (FDEMS) and the Loos resin transfer model are used to monitor and control the processing properties of the epoxy resin during RTM impregnation and cure of an advanced fiber architecture stitched preform. Once correlated with viscosity (η) and degree of cure (α), the FDEMS sensor monitors and the RTM processing model predicts the reaction advancement of the resin, viscosity and the impregnation of the fabric. This provides a direct means for monitoring, evaluating, and controlling intelligently the progress of the RTM process <jats:italic>in situ</jats:italic> in the mold throughout the fabrication process and for verification of the quality of the composites.</jats:p>

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