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measuring the pressure inside the vacuum bag using a pressure gauge to ensure that sufficient vacuum was drawn in the bag and no leak was present. First, the vacuum pump was disconnected from the bag. Then, the gauge was used to ensure that the vacuum level within the bag did not decrease by more than 1” Hg (3.3 kPa) in five minutes, as recommended by the manufacturer. The laminates were cured in a convection oven (Thermal Product Solutions Blue M). Manufacturer recommended cure cycles were used in all laminates, consisting of a four-hour room temperature vacuum hold prior to cure, a 1.5°C/min ramp rate, and a 121°C dwell of two hours for prepreg A or three hours for prepreg B. Test Matrix. The five sets of manufactured parts are summarized in Table 1. First, Sets I and II studied the effect of laminate thickness (four and eight plies), geometric complexity (corner angles of 30°, 45° and 60°) and corner type (concave and convex). These laminates comprised a baseline Set Material I Prepreg A II Prepreg B III Prepreg B IV Prepreg B V Prepreg B DOI: 10.1002/pc.23773 Debulk Pressure Strip None None None None None None None None Yes None Yes None None None None None None Yes Tool Shape Concave Convex Concave Convex Concave Convex Concave Convex Concave Corner Radius/mm 0 0 0 0 0 0 9.53, 12.7 6.35, 9.53 0, 9.53, 12.7 Corner Angle 30o, 45o, 60o 30o, 45o, 60o 30o, 45o, 60o 30o, 45o, 60o 30o, 45o, 60o 30o, 45o, 60o 30o, 45o, 60o 30o, 45o, 60o 30o, 45o, 60o No. of Plies 4,8 4,8 4,8 4,8 8 8 8 8 8 Table 1. Test matrix 9PDF Image | Vacuum Bag-Only Prepregs
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