Composite Materials

Question 1

Definition of composite materials

Answer 1

Structural material made when two or more materials are bonded together

Question 2

Structure of composite materials

Answer 2

Consists of a reinforcing material that provides strength and a bonding agent (the matrix - in a form of glues and resins)

Question 3

Carbon fibre

Answer 3

Carbon fibres, epoxy resin

Question 4

Reinforced concrete

Answer 4

Steel bars, concrete

Question 5

Glass reinforced plastic (GRP)

Answer 5

Glass fibres, polyester resin

Question 6

Laminated glass

Answer 6

Polycarbonate, polyester resin

Question 7

Tufnol

Answer 7

Woven linen layers, phenolic resin

Question 8

Benefits of composite materials

Answer 8

• Improved mechanical and other properties
• GOOD STRENGTH TO WEIGHT RATIO

Question 9

Glass fibre

Answer 9

• A string of fibre woven together
• Loose strands
• Non-woven matting of short strands
• A matrix of polyester resin
• Used in large items, boat hulls, septic tanks and pond liners

Question 10

Fibre glass manufacture

Answer 10

• Wax is applied as a mould release
• Gel coat is applied to provide colour
• Fibre glass, resin and catalyst is applied in layers and rolled out
• After curing, the part is removed from the mould excess material is trimmed and it is ready for assembly

Question 11

Composite material hazards

Answer 11

• Skin irritation due to styrene
• Peroxide in catalysts causes damage when in contact with eyes
• Toxic gases are given off
• Fibres cause skin irritation
• Dust generated when finishing
• Styrene vapours are a fire hazard