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6 Vacuum Pump Outer Bag Perforated Tool (a) Outer Bag Pressure = 1 am Inner Bag Pressure < 1 am Outer Bag Purged Inner Bag Pressure = 1 atm (b) Figure 4: Schematics of a flexible double-vacuum-bagging setup with a perforated tool during (a) degassing phase and (b) compaction phase. 2 Materials Out-of-autoclave carbon prepregs XC110 3K, 210g, 2/2 Twill with 58 % fiber content by weight were used to manufacture composite samples with both SVB and DVB techniques to investigate and compare their behaviors. All the laminate samples were stacked using an [0O]n orientation; where n is the number of the prepreg plies used. The consumables for VB assembly comprise of polyester woven breather cloth, nylon bagging film, and polyolefins perforated release film. 3 Specimens Manufacturing Method Carbon prepregs XC110 3K were given an adequate four days out-time at 20°C before producing laminates. Total of six laminate samples were produced using two difference bagging techniques (SVB and DVB) and laminate thicknesses (1.6, 2.5 and 3.2 mm), as shown in Table 1. Table 1: Manufacturing plan for laminate samples [For example: Sample 1 is produced using SVB technique which is 1.6 mm thick]. Bagging Laminate Thickness (mm) 1 SVB 1.6 2 SVB 2.5 3 SVB 3.2 4 DVB 1.6 5 DVB 2.5 6 DVB 3.2 Samples TechniquesPDF Image | Comparison of Single-Vacuum-Bag and Double-Vacuum-Bag Methods
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