Filament winding angle

Attention focuses on the cylindrical section of the hydrogen vessel subjected to internal pressure with close-end effect loading (Figure 1). The itmer radius Rq and its thickness e are constant. The vessel strength is ensured by Ug layers of filament wound composite. The k layer is characterised by its thickness ep(k) and winding angle P(k). The radial, the hoop and the axial coordinates are respectively denoted by r, 0 and z. Regarding at the usual assumption, the displacement fields is expressed as ... 

Angle Winding angle is the angular measured in degrees between the direction parallel to the filaments and an established reference. It is usually the centerline through the polar bosses, that is, the axis of rotation. 

Slip angle pattern Angle at which a tensioned fiber will slide off the filament wound dome. If the difference between the wind angle and the geodesic angle is less than the slip angle, the fiber will not slide off the dome. Slip angles for different fiber-plastic systems vary and must be determined experimentally. 

Filament winding Continuous fibres are fed through catalysed resin bath onto rotating mandrel at predetermined angle and cured Product must be symmetrical about long axis of mandrel. Pipe, tanks, leaf springs, air ducts. High fibre content... 

Filament wound flat strip composites of PE fibie-rrinforced ethylene-butane copolymer have been used for diff oit biomedical applications. Composites of three difierent matrix compositions and two winding angles were reported. The matrix composition varied with the copolymer ratio raidering the composite material softening and it is more compliant and suitable for different biomedical application [75]. 

Continuous reinforcement is placed and oriented on the mandrel surface by the position of the pay-out eye. In the most simple filament winding machine the pay-out eye is fixed to the carriage and therefore can only traverse the length of the mandrel. Hence the angle at which it is placed is dependent on the rotational speed of the mandrel and the traverse rate of the carriage. The angle of the reinforcement fibre can be any helical angle from almost axial to hoop. 

Fiber placement is basically a hybrid of filament winding and tape laying and is a continuous process for fabricating composite shapes, by laying thermoset or thermoplastic preimpregnated tows (in tow or slit tape form) onto a mandrel or tool having concave or convex surfaces. There is no limit to the fiber angle and tows can be added or removed as and when necessary. 

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