Mats Intro

Question 1

What four groups do physical properties fall into?

Answer 1

Mechanical
Thermal
Electrical, magnetic, and optical
Chemical

Question 2

List the main mechanical properties to consider

Answer 2

-Elastic
-Elastic Stiffness
-Permanently bent yield strength
-Fracture Toughness
-Density

Question 3

Define Elastic

Answer 3

When a material spring back to its original shape when force is released

Question 4

Define elastic stiffness

Answer 4

Resistance to bending

Question 5

Define yield strength

Answer 5

The maximum strength a material will tolerate before it permanently deforms

Question 6

Define fracture toughness

Answer 6

How easily a material can break

Question 7

Define density

Answer 7

How much matter is packed into a certain space

Question 8

Define hardness

Answer 8

Resistance to wearing

Question 9

List the main thermal properties to consider

Answer 9

-Service temperature
-Expansion coefficient
-Conductivity

Question 10

Define Service Temperature

Answer 10

Max or min operating temperature range that a material can be safely operated at or exposed to without compromising its functionality or integrity

Question 11

Define expansion coefficient

Answer 11

How material behave when heat is applied

Question 12

Define conductivity

Answer 12

How a material transports heat

Question 13

What are the main chemical properties to consider

Answer 13

-Fresh water
-Salt water
-acids and alkalis
-Organic solvents
-Oxidation
-UV radiation

Question 14

What are the main electromagnetic properties to consider?

Answer 14

-Resistivity
-Dielectric response
-Magnetic behaviour
-Refraction and absorption

Question 15

Define resistivity

Answer 15

How much a material resists to a electrostatic field

Question 16

Define dielectric

Answer 16

A material that is a poor conductor of electricity but is an efficient supporter of electrostatic fields.

Question 17

What is embodied energy?

Answer 17

Its the energy required to produce 1 kg of the material, including that used to mine and refine feedstocks, and that required to refine or synthesise these into usable material stock.

Question 18

What is carbon footprint?

Answer 18

The amount of carbon released due to the production of 1 kg of the material

Question 19

What is water demand?

Answer 19

The volume of water that is drawn from usable sources and not returned to them during the production of 1 kg of material

Question 20

What are the three levels of structure?

Answer 20

-Macrostructure
-Microstructure
-Atomic structure

Question 21

What are different classes of materials?

Answer 21

-Polymers
-Ceramics & glasses
-Metals
-Semiconductor
-Composites

Question 22

What are some characteristics of polymers?

Answer 22

-Flexible
-lightweight
-Easily processed

Question 23

What are some characteristics of ceramics?

Answer 23

-High hardness
-High strength
-High melting points
-Brittle

Question 24

What are some characteristics of metals?

Answer 24

-Excellent conductors of heat and electricity
-Ductile (stretch, bend and deform them)
-Strong

Question 25

What are some characteristics of semiconductors?

Answer 25

-Have a bandgap separating valence and conduction bands
-Are polymers along with metals

Question 26

What are some characteristics of composites?

Answer 26

-A mixture of 2 different material classes