Winding technique

In general, the process conditions that can be selected and controlled independently during filament winding are  

winding speed and hold time between layers 

initial fiber tension for each layer during winding 

external temperatures, heating rates, and pressures during the winding, cure, and postcure stages 

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Wind the magnetic component using the described physical winding techniques given in Section 3.5.9. 

Figure 3-26 Winding technique for minimizing inter-turn capacitance.

Figure 3-68 The transformer winding technique for design example 3.15.3.

The prepreg winding technique offers better control of fiber volume fraction, but at a cost. Material costs are 1.5 to 2 times higher, and there are additional costs associated with storing the preimpregnated (thermosetting matrix) tows. Preimpregnated tows are used almost exclusively for thermoplastic matrix materials, where there are no shelf-life restrictions. 

The techniques generally used for inhibition of rocket propellants are sleeve technique, tape winding technique and casting technique and their salient features are as follows ... 

The assembly for inhibition by thread-winding technique is shown in Figure 4.13 except that a propellant grain is used in place of a collapsible mandrel. 

The inhibition of composite propellants is somewhat easier than that of DB propellants. The binders used for composite propellants (with or without fillers) have been reported for inhibition of composite propellants. Such inhibition systems possess stronger bonds with composite propellants and prove to be more compatible coupled with better shelf-life of the inhibited propellants. However, epoxy or novolac epoxy resin with or without inert fillers is generally preferred for the inhibition of composite propellants due to a combination of properties possessed by them. The inhibition is usually done by casting technique and inhibition thickness is usually required on higher side in order to make the missions successful. In India, thread winding technique or inhibitor sleeve technique is preferred where 2.5-3.0mm inhibition thickness is sufficient as against 3.5-4.0 mm in case of inhibition by casting technique . 

Corrosion Resistant Fiber-Reinforced Plastic (FRP), Fiber glass reinforcement bonded with furfuryl alcohol thermosetting resins provides plastics with unique properties. Excellent resistance to corrosion and heat distortion coupled with low flame spread and low smoke emission are characteristics that make them valuable as laminating resins with fiber glass (75,76). Another valuable property of furan FRP is its strength at elevated temperature. Hand-layup, spray-up, and filament-winding techniques are employed to produce an array of corrosion-resistant equipment, pipes, tanks, vats, ducts, scrubbers, stacks, and reaction vessels for industrial applications throughout the world. 

Note that Pg > 2 is critical, because the solution presents a sign change, which means the solution becomes unstable (see Figure 8.17). The root of the problem is explained by the info-travel concept. To generate the difference equation (eqn. (8.66)) we used a central finite difference for the convective derivative, which is incorrect, because the information of the convective term cannot travel in the upstream direction, but rather travels with the velocity ux. This means that to generate the FD equation of a convective term, we only take points that are up-stream from the node under consideration. This concept is usually referred to as up-winding technique. For low Pe the solution is stable because diffusion controls and the information comes from all directions. 

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