Abstract
Abstract High pressure resin transfer molding technology is used for the mass production of lightweight composite parts. The external pressure exerted has an impact on the actual pressure value of the preform in the mold cavity, which affects product quality. A polymer-encapsulated optical fiber pressure sensor is proposed to measure the lateral pressure in a closed and severely confined mold cavity. The quartz sand particles were mixed with water-borne polyurethane in a semi-cured state, and then made into a thin ribbon, and single-mode bare optical fiber was embedded between the two layers for overall curing and molding to obtain an ultra-thin polymer optical fiber transverse pressure sensor. Several sensor samples with two specifications of length×width×thickness of 150 mm×1.3 mm×0.45 mm and 150 mm×4.0 mm×1.0 mm were prepared, and both samples were placed simultaneously in the middle layer of 30 layers of uniaxial non-crimped glass fiber, namely 15 layers, for pressure experiments. The experimental results show that the optical loss of polymer-encapsulated optical fibers is proportional to pressure, and optical fiber samples with a width of 4 mm can withstand lateral pressures up to 40 MPa, providing an important monitoring method for pressure measurement in high-pressure resin transfer molding chambers.
Published Version
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