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International Journal of Advanced Science and Technology Vol.87 (2016) approximately 137 gms. So for this application we need to add 137 gms of CY 230 and 13.7 gms of HY 951. But there exists a practical problem that if we use exactly this resin- hardener mixture it is not sufficient to wet all the fabric sheets because some of it will be wasted during spreading, at infusion tube, flange and catch pot etc. So it is better to have 150 gms of CY230 and 15 gms of HY951. This mixture is finely mixed for about 1-2 min using a mixing scoop to release the dissolved gasses. If the mixing time increases it starts solidifying. 3.4. Fabrication A small spreader sheet is used to spread the resin hardener mixture uniformly on the Mylar sheet so that the adjacent fabric wets out completely. We add one by one fabric sheet and also spread the mixture uniformly between the glass fabrics. Always spreading should be done in the direction of fiber if not it disturbs the fibers of fabric shown in Figure 2.a. Now place a peel ply fabric to peel out the laminate easily after it is completely dried out and also place a perforated sheet to absorb excess resin from perforates and this is followed by 2 layers of breather sheets (shown in Figure 2.b and 2.c to absorb the air lying between the mold and bagging sheet (shown in Figure 2.d) and also it eradicates the formation of flange impression observed after the casting completely dries out. Figure 2. Fabrication of Glass Fiber Reinforced Plastic composites using Vacuum Bagging Process (a) Wetting the fabrics using spreader sheet (b) Placing Peel ply fabric and Perforated sheet (c) Placing two layers of Breather sheet (d) Bagging sheet with flange (e) Fabrication unit connected with catch pot of vacuum pump Flange is placed on the top side of this setup to have the property of weight and to send the excess reisn to the catch pot. Place the bagging sheet over this setup in such a way that it should pass through topside opening of flange. Check the sealing of bagging sheet with tacky tape throughout the periphery. Mount the flange with a clamp and connect the infusion tube in between flange and catch pot and seal it as shown in Figure 2.e. A unified model to describe the combined mass and momentum balance between the resin and fibers is given by [30, 31]. Where Vf is the fiber volume fraction, Vif is the velocity of fibers, p is the resin pressure, μr is resin viscosity and Kij is the permeability tensor of the anisotropic fiber 42 Copyright c 2016 SERSCPDF Image | Fabrication of Continuous GFRP Composites using Vacuum Bag
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