Composite Materials

Question 1

composite material: definition

Answer 1

structural material made when two or more materials are bonded together

Question 2

composite material: structure

Answer 2

consists of a reinforcing material that provides strength and a bonding agent (the matrix - in the from 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

Answer 5

glass fibres
polyester resin

Question 6

laminated glass

Answer 6

plastic (polycarbonate)
polyester resin

Question 7

tufnol

Answer 7

woven linen layers
phenolic resin

Question 8

benefits of composite materials

Answer 8

• material has improved mechanical and other properties
• GOOD STRENGTH TO WEIGHT RATIO

Question 9

fibre glass

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. e.g. boat hulls, septic tanks, pond liners

Question 10

production using fibre glass (lay-up procedure)

Answer 10

• wax applied as a mould release.
• gel coat is applied to provide colour.
• fibre glass, resin + catalyst is applied in layers and rolled out.
• after curing, the part removed from the mould. Excess material is trimmed and it is ready for assembly.

Question 11

composite material safety

Answer 11

• skin irritation due to styrene
• peroxide in catalyst causes damage when in contact with the eyes
• toxic gasses are given off
• fibres cause skin irritation
• dust generated when finishing
• styrene vapours are a fire hazard