Filament winding circumferential

Figure 21.58 Circumferential or hoop winding. Source Reprinted with permission from Shaw-Stewart D, Filament winding-materials and engineering, Materials and Design 6, No. 3, 1985. Copyright 1985, Elsevier.

NOL ring The NOL ring is a parallel filament-or tape-wound hoop test specimen used in filament winding and developed by the Naval Ordinance Laboratory (NOL), now Naval Surface Weapons Laboratory, for measuring various mechanical strength properties, such as tension and compression, of the reinforced fiber material. The specimen is wound so that the fibers are in the circumferential direction. 

Whirling-arm filament winding is illustrated in Figures 23 and 24. Polar wind is accomplished hy means of the C-shaped arm, which supplies filaments from feed eyes at both extremities. While whirling on its horizontal axis, the arm winds on the polar axis of the mandrel, which is circumferentially indexed at appropriate intervals. During polar wind, the horizontal winding arm is retracted ... 

The fiber mass fraction, and the flexural and tensile properties of the continuous fiber-reinforced composites produced by various techniques were determined according to ISO 1172, ISO 178, and EN 60, respectively. The split disk test method according to ASTM 2290 was employed to determine the circumferential strength and modulus of the pipes produced by filament winding. 

The filaments are applied to the mandrel by circumferential or helical winding both require uniform filament tension, even resin coating, correct filament patterns, and temperature control throughout. 

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