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dataset that was used to evaluate the effect of further process modifications. In Set III, the influence of intermediate debulking was assessed by applying a five-minute vacuum hold after laying down every 2 plies. In Set IV, the effect of mold corner curvature was analyzed, using corner radii of 9.53 mm and 12.7 mm for concave corners and 6.35 mm and 9.53 mm for convex corners. Finally, in Set V, the local pressures at the concave corners were intensified by the application of pressure strips. One laminate was manufactured for each test point. Quality Analysis. Two samples were cut along the laminate length from each laminate for analysis. To avoid edge effects, samples were taken no closer than 10 mm from the end. The two inward-facing cross-sectional areas were polished to 2400 grit abrasive using a metallographic grinder/polisher (Buehler MetaServ). A digital stereo microscope (Keyence VHX-600) was used to capture micrographs over the entire cross-sectional area at a 100 × magnification. These individual micrographs were stitched into a complete image of the cross-section. For convenience, the complete image was divided into a corner region and two flange regions. Figure 2: Thickness measurement locations for: (a) concave corner laminate, (b) convex corner laminate, (c) concave corner laminate manufactured with a pressure strip DOI: 10.1002/pc.23773 10PDF Image | Vacuum Bag-Only Prepregs
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