Tape windings

In practice a uniform distribution of the working stress cannot be achieved, but it may be approached by various methods of constmction such as compound shrinkage, tape winding, and autofrettage which have their origin in the design of ordnance. 

Composite processing uses specialized methods. For thermoplastics, glass mat thermoplastic (GMT) is the main method but prepreg, lay-up, tape winding, pultrusion are also used to produce composites. SMC/BMC are the main processes for thermosets but lay-up is currently used for large parts and prepregs are used for high-tech parts. 

Figure 5.26 shows the principle of filament or tape winding. 

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 ... 

Similar to tubing, film or tape can also be made to have heat shrinking characteristics. Prestretched polyvinytidene fluoride from Du Pont (Teldlar) is the most commonly used shrink film because it shrinks readily on apptication of heat. It is often used in filament or tape winding operations to maintain pressure on the winding during cure. 

A thermoplastic composite pipe produced by the tape winding process consists of two building blocks the mandrel (wall thickness t , internal radius r ) and the load-bearing composite tape (thickness f ) wound under a winding angle a with respect to the axial direction of the pipe and restraining the mandrel (Figure 2). The extruded mandrel is based on one constituent only, i.e. a viscoelastic polymer of the stress/strain response described by ct = f A, B, C, e). The three parameters are relatable to the initial stiffness and the coordinates of the yield point. The... 

Ke)Words composite pipe, design, modelling, tape winding, Plytron ,... 

For processing fully consolidated tape materials the process simulation tool ProSimFRT has been developed at IVWProSimFRT enables simulation of the component quality depending on the void content and the surface roughness. The simulation can be used for tape winding as well as tape placement processes using a compaction roller. 

Funck R and Neitzel M (1995) Improved thermoplastic tape winding using laser or direct-flame heating, Compos Manw/6 189-192. 

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