4.2 f

Question 1

define composite material

Answer 1

made from 2 or more materials w hugely different properties that, when combined, create a new material with new characteristics

Question 2

why is an alloy not a composite

Answer 2

in an alloy the diff materials are mixed, and they become one. composite – materials are just fixed together, keeping their original properties

Question 3

epoxy (thermoset plastic) is used often to hold together the materials

Answer 3

yea

Question 4

composite forms

Answer 4

fibre – long strands embedded in matrix
sheet – layers of material bonded together
particle – small particles mixed into matrix

Question 5

matrix

Answer 5

the “glue” that binds particles and fibres together. typically a liquid that becomes hardened through a chemical reaction

Question 6

composite processes

Answer 6

weaving – fibres interlaced to create a fabric that can be combined w matrix material

moulding – composite materials are shaped into desired form using a mould

pultrusion – fibres are pulled through a heated die, which shapes the material into long, straight parts

lamination – layering sheets with a matrix in-between each one

Question 7

examples of common composites

Answer 7

concrete
plywood
fibre glass (plastic and fine fibres of glass)

Question 8

composite materials adv

Answer 8

much stronger

highly resistant to chemicals, will never rust

Question 9

composite materials disadv

Answer 9

cant be recycled

very expensive

air bubbles in matrix will cause weak spots