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increased linearly with corner angle. However, this trend was not consistent in convex corner parts. For a given corner angle, the CoV decreased as the laminate thickness increases in both mold types. Similar thickness variation behavior was observed in prepreg B laminates, as shown in Figure 4, indicating that prepreg age affected the amount of voids but not the variation in laminate thickness, and that mechanisms governing laminate dimensional uniformity were therefore generally applicable. Laminates with a wider flange on one side (127 mm (flange 1) versus 63.5 mm (flange 2)) were also manufactured to evaluate the effect of flange width, and results showed that flange width had no significant effect on thickness variation of laminate or on fiber distribution. Figure 5 shows representative micrographs of laminates manufactured over concave and convex molds. Microstructural defects were observed, including voids, corner thickening and corner thinning, and resin accumulation. Generally, more defects were observed in the concave molded laminates than in their convex counterparts. In the concave corner, resin was accumulated beyond the fiber bed, resulting in greater thickness changes in corner regions, while curvature radii DOI: 10.1002/pc.23773 Figure 4: Thickness variation of laminates made of prepreg B 13PDF Image | Vacuum Bag-Only Prepregs
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