DEFINITION:
Composite = when two or more materials are combined through bonding.
COMPOSITE MATERIALS:
- Have improved mechanical and physical properties.
- High weight to strength ratio.
- --> main advantage is that properties can be enhanced and utilised.
THREE TYPES OF COMPOSITES:
1. Fibre Reinforced Composites: A material that is made up of resins and fibres. Can also refer to materials such as reinforced concretes, where reinforcing rods (fibres) have been added to the mix.
- Good strength to weight ratio
- Resistant to corrosion
- Possess a low thermal expansion
2. Particle Based Composites: Composites that consist solely of particles of two or more different materials, e.g cements or concrete.
- High strength in compression, as in the case of concretes, less so in tension
- Good stability
- A uniform structure ensuring consistent strength
- Generally free from surface defects
3. Sheet Based Composites: This refers to sheet or moulded materials in the sense of man made boards this is where wood or wood fibre are bonded together to form a 'new' material.
- Increased stability against warping
- Have an equal strength in all directions - unlike natural timbers
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