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International Journal of Advanced Science and Technology Vol.87 (2016) perform. When high permeability layers are used over the fiber perform, an effective permeability tensor is used for Kij. Subscripts of i and j are the direction indices. A collecting cup is placed inside the catch pot so that the excess resin will be collected. The top surface of the catch pot is fixed with a Poly Tec pressure gauge connected to the ALUE vacuum pump using a quick return valve. Turn ON the pump it starts sucking air and excess resin. Carefully check the air leakage by hearing the small sound coming from the fabrication setup. Spread the bagging sheet uniformly such that sucking will be done smoothly. Wait for a while until the pressure reaches -95 Kpa in -100 Kpa pressure gauge or -28 inHg in -30 inHg gauge. Shut down the vacuum pump and observe whether the pressure is maintained constant or not. Finally more the constancy in pressure greater the quality of the product because it indicates that the air has not sucked back i.e. no voids occur inside the laminate. 4. De-moulding the Laminate The vacuum pump should stay on until the part is fully cured. Generally it takes 24-28 hours to cure and is completely done at atmospheric temperature. After that cut the bagging film around the edge and remove. Remove the bagging tape, pull out the peel-ply (this will take a little bit of force) and finally remove the part from the mould. 5. Cut the Specimen The final laminate obtained has improper edges and also to prepare required specimens a BOSCH wood cutting machine (230 V, 50Hz, 8amps) was used. The cutting blade made up of stainless steel having outer diameter of 254 mm and inner diameter of 30 mm. At first the FRP laminate is made to pass across the blade such it trims the laminate and now based on the width of the specimen to be cut keeping an allowance of 3-5mm on each side, the distance between horizontal column and cutting blade is measured with steel rule and fixed. Figure 3. a.) Trimming the Edges of FRP Laminate b.) Measure the Distance between Cutting Wheel and Column according to Specimen Width c.) FRP Laminate is Protected by Wood Pieces of same Size on Top and Bottom Side d.) Final Trimming on Universal Milling Machine with Diamond Coated Carbide Tool After cutting the specimen the edges will have small sharp fibers so this will be removed on universal milling machine that can be operated horizontally and vertically. If we directly use the laminate due to brittleness it may get damaged so the top and bottom side is protected by placing wood pieces of same dimensions as that of laminate. A diamond coated carbide cutting tool rotating at 2000 rpm is used to trim the laminate finally by moving it around the laminate. Finally the laminate is removed from the fixtures and used for testing. Copyright c 2016 SERSC 43PDF Image | Fabrication of Continuous GFRP Composites using Vacuum Bag
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