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Figure 9: Thickness variation of laminates manufactured with various tool corner curvatures: (a) concave corner laminates, (b) convex corner laminates Inspection of polished sections revealed that resin accumulation within the corner regions was almost eliminated in all cases. Figure 9 (a) and (b) show the CoVs in concave and convex laminates versus mold radius. In concave laminates, the CoV decreased with increasing corner radius. Moreover, the difference in thickness uniformity between corner angles was also greatly reduced. Molds with large corner radii required the fiber bed to deform less, and therefore prevented resin accumulation. In concave laminates fabricated on molds with radii of 12.7 mm, the CoV decreased close to that of the flanges (about 0.02). In convex laminates, larger corner radii also decreased the thickness variation, but the effect was less pronounced than in concave corner parts, since only the prepreg plies closest to the tool were affected. These observations indicated that increasing the radius of curvature of the mold was an effective and practical approach to reduce (or control) thickness variation at corners in low- pressure VBO processing, especially when concave tooling was used. In addition, increasing the corner curvature could also counteract the detrimental effects of increasing geometric complexity, DOI: 10.1002/pc.23773 18PDF Image | Vacuum Bag-Only Prepregs
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