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allowing parts with large corner angles to attain the same dimensional consistency as those with smaller angles. 3.4Set V - Pressure Strip Application The pressure distribution conditions at a concave corner can be improved by using a pressure strip (a silicone insert) placed between the bag-side release film and the breather. The strip concentrates the pressure at the corner region, while potentially mitigating the effects of consumable bridging. Laminates comprised of eight plies of prepreg B prepreg were fabricated using pressure strips over molds with sharp corner radii (as in Sets I and II) and corner radii of 9.53 mm and 12.7 mm (as in Set IV). During layup, the pressure strip material was carefully shaped into the form of the concave mold. Debulking was not performed. Figure 10 presents the thickness variation of laminates produced with and without pressure strips. For molds with corner radii of 0 mm and 9.53 mm, thickness variation was greatly reduced by deployment of pressures strips, indicating that the insert redistributed pressure and concentrated compaction force at corner regions, increasing the extent of conformation of the fiber bed to the Figure 10: Thickness variation of laminates manufactured without and with a pressure strip DOI: 10.1002/pc.23773 19PDF Image | Vacuum Bag-Only Prepregs
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