Shaping processes fo rubber and polymer matrix composites 0.0 / 5 ? EngineeringThermoUniversityNone Created by: Cakeboss15Created on: 27-05-19 16:18 What are the principal polymers used in fiber-reinforced polymers? Principal polymer matrices in FRPs are unsaturated polyesters and epoxies. 1 of 13 What is the difference between a roving and a yarn? A roving consist of untwisted filaments, a yarn consisted of twists fibres 2 of 13 In the context of fiber reinforcement, what is a mat? A mat is a felt consisting of randomly oriented fibres held loosely together in a binder 3 of 13 Why are flakes considered to be members of the same basic class of reinforcing material as particles? Flakes are simply particles that posses very low width to thickness ratio 4 of 13 What is sheet molding compound (SMC)? SMC consist of TS polymer resin, fillers, chopped glass fibres, all rolled into a sheet 5 of 13 How is a prepreg different from a molding compound? Progress have continuous fibres rather than chopped fibres as in moulding compounds 6 of 13 Why are laminated FRP products made by the spray-up method not as strong as similar products made by hand lay-up? In hand lay-up oreantion fibres are controlled, in spray up, the fibres in each layer are randomly orientated 7 of 13 What is an autoclave? An autoclave is an enclosed chamber which can supply head and/or pressure at controlled levels 8 of 13 What are some of the advantages of the closed mold processes for PMCs relative to open mold processes? Good finish, higher production rates, closer control over tolerances, more complex shaped possible 9 of 13 Identify some of the different forms of polymer matrix composite molding compounds Sheet moulding compounds, thick moulding compounds and bulk moulding compounds 10 of 13 What is filament winding? is a process in which resin-impreganted continuous fibres are wrapped around a orating mandrel with the internal shape of the FRP 11 of 13 Describe the pultrusion process. Pultrusion is a process in which continious fibres are dipped into a resin and pulled through shaping die where the resin cures. 12 of 13 How are FRP's cut? They are cut with knives, scissors, power shears, laser bean and water jet cutting. 13 of 13
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