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Figure 6: Overall thickness variation and fiber bed thickness variation in prepreg B laminates: (a) four-ply laminates, (b) eight-ply laminates corner laminates, the two thickness data sets were generally comparable. Locally, the fiber bundles nearest the mold had a curvature radius of 0.8 mm, which was much less than that of the far-field plies (4 mm). This specific difference implied that in convex laminates, corner thinning arose due to increased compaction pressure at the sharp corner region but was limited by the average stiffness of the fiber bed during low-pressure processing. To support this assertion, the length of the accumulated resin region in concave corners was measured directly from micrographs (as shown previously in Figure 5 (a)). Figure 7 shows the concave corner resin length as a function of corner angle in prepreg B laminates. The resin length generally increased with corner angle, just as the CoV of the overall thickness increased, confirming that thickness variation in concave laminates was generated primarily by resin accumulation. From the results described above, we concluded that defect formation mechanisms in concave corner laminates were more prone than their convex counterparts to parameters such as corner DOI: 10.1002/pc.23773 15PDF Image | Vacuum Bag-Only Prepregs
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