Composite Materials Engineering Specialists in Carbon Fibre - IN LIQUIDATION - JULY 2009 -
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Filament Winding, Carbon Fibre Angles in Composite Tubes

Filament Winding, Carbon Fibre Angles in Composite Tubes

Fibre Angles

Fibres can be positioned at any angle within the tube, with different layers at different angles to carry the various internal and external loads applied. Tubes are seldom made of pure 0 degree or pure 90 degree fibres as they would easily split.

0 Degree (Axial)
Makes tubes resistant to longitudinal bending and axial tension/compression

90 Degree (Hoop)
Resists internal/external pressure, helps a tube to stay round and provides consolidation in conventional filament winding

± 45 Degree
The ideal fibre angle to resist pure torsion.

Intermediate Angles
Tubes seldom have only one load applied to them, therefore a tube will need at least 2 of the above angles need to be incorporated to carry the combined loads. Most combined loads can be carried with fibres at an intermediate angle.
e.g.
For Internal pressure the hoop stress is twice the longitudinal stress use approx. ± 55.
For External pressure as above but to resist buckling use approx. ± 65.
For Quasi-Isotropic laminate use ± 22.5 & ± 67.5 alternate layers.
For bending with torsion angles between ± 5 to ± 25 are appropriate.

At Performance Composites we try to understand your requirements and help customers to understand composites so that between us we can create products that work.

 

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