Friday, 19 May 2017

COMPOSITES

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
 
Image result for types of composites diagram
 
 
 


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