The Composite’s properties are mainly influenced by the choice of fibers. Three types of fibres are Glass fibre, Carbon fibre, Aramid fibre. All fibres have generally higher stress capacity than ordinary steel and are linear elastic until failure. The most important properties that differ between the fibre types are stiffness and tensile strain.
Carbon Fibre Properties:
- High Modulus of Elasticity 200 – 800 GPa.
- Tensile Strength 2500 – 6000 MPa.
- Density 1750 – 1950 Kg / m3.
- Ultimate Elongation 0.3 – 2.5 %.
- Carbon fibres do not absorb water.
- Carbon fibres are resistant to many chemical solutions.
- Carbon fibres withstand fatigue excellently.
- Carbon fibres do not show any creep or relaxation.
- Carbon fibre is electrically conductive.
When the fibre and the matrix are combined into a new material it becomes a composite. The fibres may be placed in one direction in the composites and then the composite is unidirectional. However fibres may also be woven or bonded in many directions and the composite becomes bi or multi directional.
- Hand lay up method
- Pultrusion method
- Filament winding
Carbon Fibre Reinforced Polymers (CFRP):
CFRP is sometimes referred to as Carbon Fibre Reinforced Plastic is similar to fibre glass. Carbon fibre is woven into a textile material and resin such as epoxy resin is applied and allowed to cure. The resulting material that is very strong as it has the best strength to weight ratio of all construction materials. It is an improvement on glass fibre reinforced plastic, although much more expensive.
Carbon Composite (CFRP) Friction Bearings:
Friction bearings commonly use lubricating oil to separate the moving component from the mated non-moving bearing surface. Friction bearing surfaces commonly consist of a material that is softer than the supported component.
These friction bearings provide excellent dry running characteristics and can be used in operation after lubrication system failure making them an ideal solution for use in pumps and construction machinery as well as in mechanical engineering and shipbuilding or in offshore and onshore facilities to reduce maintenance and increase reliability. It can withstand up to 260 degree Celsius.