T1

Question 1

6 property classifications of materials that determine their applicability?

Answer 1

Mechanical 
Electrical
Magnetic 
Thermal 
Optical
Deteriorative (chem reactivity)

Question 2

3 criteria that are important in material selection

Answer 2

In service conditions
Deterioration
Economics

Question 3

Primary classification of solids

Answer 3

Metal (still/strong/ductile)
Polymer (low density/ductile/pliable/inert)
Ceramic (stiff/strong/hard/brittle/fracturable)
Composites (2+materials, better than each)

Question 4

Advantages of glass vs metal cans

Answer 4

Glass prevents CO2 diffusion, transparent but brittle

Metals prevent diffusion, impact resistant but opaque

Question 5

Different scales of interest

Answer 5

(Sub)Atomic: e-, oxidation states
Nano/microscopic: porosity
Macroscopic: viewed with eyes

Question 6

Advantages of using carbon fibre reinforced polymer composites

Answer 6

Stiffer, stronger, lighter, directional strength properties.
BUT
Expensive, hard to recycle and define a fatigue endurance limit

Question 7

Why are ceramics good insulators?

Answer 7

No free electrons so low electronic thermal conductivity

Question 8

Why are carbon nanotubes strong

Answer 8

C-C covalent bonds

Each tube a single crystal so no weak spots

Question 9

3 plastics

Answer 9

Thermoplastic- softened by heat and moulded
Thermoset- formed by heat then set and cant change
Elastomer- amorphous existing above GTT

Question 10

2 main subcategories of metals and alloys

Answer 10

Ferrous - alloys with Fe and C

Non - alloys and metals with no iron