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

Filament Winding, Carbon Fibre Types in Composite Tubes

Fibre Types

A tube is comprised of several layers, the fibre type and angle for each layer is arranged to give the overall mechanical properties required by the application.
(Properties listed below are for composites made from UD fibres @ 60% Vf)

Glass Fibre
A low cost fibre with good strength, but relatively low stiffness and high density.
Typically UTS 1.0 Gpa Modulus (Ex) 40 Gpa Density 1.9 g/cc

Aramid Fibre
Tradenamed 'Kevlar' or 'Twaron', aramid fibres have excellent tensile strengths, nearly twice as stiff as glass fibre, also lighter, but often needs to be combined with other fibres to achieve acceptable compressive strengths.
Machining can be a problem.
Typically UTS 1.3 Gpa Modulus (Ex) 75 Gpa Density 1.4 g/cc

Carbon Fibre (Standard Grade)
Standard grade carbon fibres have a good combination of strength with stiffness. With a specific modulus of 92, over 3 times that of metal (Steel and aluminum are both the same) carbon fibre / epoxy laminates are finding increasing application.
Typically UTS 1.5 Gpa Modulus (Ex) 130 GPa Density 1.6 g/cc

Carbon Fibre (Special Grades
Standard grade carbon fibre (T300, HTA, etc) have mechanical properties with out resin of approx. 3 - 3.5 GPa tensile strength and 230 - 240 GPa Tensile modulus.

Carbon fibre manufacturers are constantly trying to improve the modulus and strength of their fibres, tensile strengths go up to 7 GPa and Tensile modulus up to 700 GPa, however it is not possible to get a fibre with both the above properties, 'strong' fibres are not as 'stiff' and visa-versa.

There are many grades now available, however increased properties means higher prices, up to 600.00 per Kg (not for the faint hearted).

 

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