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tool surface. However, the pressure strip did not affect laminates produced using the mold with a corner radius of 12.7 mm, since the tool geometry already reduced the CoV close to flange levels. These results indicated that the application of pressure strips was an effective method for reducing thickness variation in laminates produced over concave molds with relatively low corner curvatures (0 mm and 9.53 mm). They are therefore well-suited to situations in which the part geometry is tightly prescribed and cannot be locally adjusted by changing the mold geometry. While the use of pressure strips effectively reduced CoVs in concave laminates, poorly compacted areas (or laminate fillets) were sometimes observed at the boundary of the region of application, as shown in Figure 11 (a). These defects were sensitive to the manner in which the pressure strip was placed, and could be eliminated by carefully designed layup. However, they reduced the robustness of the process. In addition, the use of pressure strips was also associated with concentrated void distributions along the pressure strip, as shown in Figure 11 (b). These Figure 11: Typical microscopic images of laminates manufactured with a pressure strip: (a) laminate fillet at the end of the pressure strip, (b) void distribution DOI: 10.1002/pc.23773 20PDF Image | Vacuum Bag-Only Prepregs
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