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Figure 1 – Schematic of the vacuum-bagging consumables sequence on the convex aluminum tool. Cure cycle: The baseline and half-vacuum loss laminates are first held for 12 hr at room temperature under full vacuum and half-vacuum, respectively, in order to allow for maximum evacuation of entrapped air. The laminates are subsequently cured in a regular Blue M lab convection oven. The cure cycle is optimized using the cure kinetic model developed by Kratz et al. for Cytec Cycom® 5320 [25]. It consists of the following stages: i) curing at 120 °C for 2 hr with a heat ramp of 2 °C/min, ii) air cooling to RT and part removal from the tool, iii) post-curing at 180 °C with a heat ramp of 2 °C/min, and iv) final air cooling to RT. The laminates are post-cured freestanding in order to minimize cure-stresses induced by the mismatch in CTEs between the aluminum tool and composite laminate. The vacuum bag pressure and laminate-tool interface temperature are monitored to ensure that no undesirable process deviations occur. The final degree of cure is estimated at 98.5 % for all laminates based on the cure cycle and cure kinetics model. 20th International Conference on Composite Materials Copenhagen, 19-24th July 2015 Peel ply used as breather Vacuum bag Breather strips Edge breathers / sealers Release agent Non-perforated release film strips Sealant tape Non-perforated release film Laminate Through-thickness vacuum port A Nominal specimen dimensions B Curved beam strength fixture P 5.91 ± 0.08 mm 89.2 ± 0.07° Width: 25.64±0.33mm Figure 2 – Schematics of the A) nominal corner specimen dimensions and B) the curved beam strength fixture (ASTM D6415) with a loaded specimen (the fixture is partially sectioned-off in blue to more clearly show roller-specimen contact). Specimen machining: Corner specimens are cut from each sample corner plate with a water- lubricated, circular diamond saw fitted with a polymer matrix composite-specific wafer diamond blade. Painstaking care is taken to impart as little machining-induced damage to the corner regions. Poor machined-edge quality is directly can lead to reductions in interlaminar strength properties and large corresponding data scatters [24, 26]. The specimens are then hand finely ground on a polishing machine up to a diamond grit of 1200 (Struers MD-PianoTM discs) in order to remove the majority of remaining machining artefacts (i.e. microscopic surfaces notches). The nominal specimen dimensions are given in Figure 2A and adhere to those prescribed in ASTM D6415 [24]. Of the multiplePDF Image | VACUUM-BAG-ONLY COMPLEX-SHAPE PREPREG LAMINATE
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