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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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