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corner regions, respectively. The average void contents over the entire cross-sections were < 2% in all prepreg A laminates. However, void contents were < 0.5% in laminates made of prepreg B, which was much less than those in the corresponding prepreg A samples. The relatively high void content in prepreg A laminate was attributed to the prepreg age, which resulted in reduced tack and potentially compromised the ability for resin to flow and eliminate entrapped air. For prepreg A, the void content increased with laminate thickness in a quasi-linear manner in all three regions, but the defect level increased more markedly in the concave corner regions than in the convex corner regions, where behavior was similar to that of the flange areas. In contrast, the void content in prepreg B was negligible, and no clear trend was observed. Figure 3 (b) shows the coefficient of variation (CoV) for thickness of concave and convex laminates made of prepreg A. The thickness variation in concave parts was generally greater than those in convex parts. Furthermore, in the concave laminates, for a given number of plies, the CoV Figure 3: Laminates made of prepreg A: (a) void content in flange region, concave corner region and convex corner region; (b) thickness variation DOI: 10.1002/pc.23773 12PDF Image | Vacuum Bag-Only Prepregs
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