General

Question 1

Definition of density

Answer 1

Measure of mass per volume unit

Question 2

Unit of density

Answer 2

kg/m^3

Question 3

Definition of fatigue

Answer 3

Cracking due to repeated cyclic loading over time

Question 4

Definition of elasticity

Answer 4

The material returning to its original shape after the deforming force is removed

Question 5

Definition of strength

Answer 5

Resistance to deformation or how much stress can be withstood before breaking.

Question 6

Definition of hardness

Answer 6

Resistance to penetration, wear or cutting actions

Question 7

Definition of plasticity

Answer 7

Allows a material to be reshaped and keep it.

Question 8

Definition of ductility

Answer 8

Allows a material to be stretched into thinner sections without breaking

Question 9

Definition of Malleability

Answer 9

Allows the material to be stretched or shaped by force without breaking

Question 10

Definition of toughness

Answer 10

Ability to be deformed without breaking

Question 11

Definition of brittleness

Answer 11

Resistance to change of shape

Ability to break when hammered or deformed

Question 12

Definition of conductivity

Answer 12

Ability to transmit heat or electricity

Question 13

Definition of durability

Answer 13

Ability to withstand forces over time

Question 14

What are the 3 stresses?

Answer 14

Tensile
Compressive
Shearing

Question 15

Definition of tensile strength

Answer 15

Stretching forces that result in stress

Question 16

Definition of compressive stress

Answer 16

Stress created by forces trying to squash/shorten an object

Question 17

Definition of shearing stresses

Answer 17

Stresses created by shearing forces

Question 18

Combined stresses combinations?

Answer 18

Tensile and shearing

Compressive and shearing

Question 19

What is simple stress?

Answer 19

One of the 3 stresses acting alone

Question 20

What is unit stress?

Answer 20

The amount of deformation on one dimension of a body compared to the original dimension’s size

Question 21

What is poisson’s ratio?

Answer 21

Negative ratio of lateral strain and longitudinal unit strain for a material under longitudinal stress within the proportional limit

Question 22

What is the elastic limit?

Answer 22

The point where a material can be deformed up to before it will no longer return to its original shape

Question 23

What is the yield point?

Answer 23

The maximum stress before permanent deformation

Question 24

What is a ferrous material?

Answer 24

A material containing iron

Question 25

What is non ferrous?

Answer 25

A metal without any traces of iron

Question 26

What is the ultimate tensile stress?

Answer 26

The maximum tensile stress that can be applied before breaking the material

Question 27

What is the breaking point of a sample?

Answer 27

Modulus of elasticity: | Ratio of stress and strain

Question 28

3 most important lightweight metals in the industry?

Answer 28

Aluminium and their alloys Titanium and their alloys Magnesium and their alloys

Question 29

Structure of metals

Answer 29

Crystalline

Question 30

Body centred cubic (BCC)

Answer 30

9 atoms, one in each corner and one on the centre

Question 31

Face centred cubic

Answer 31

14 atom, one in each corner and one in the centre of each face

Question 32

What metals are hexagonal close packed and how many atoms are there?

Answer 32

``` 17 atoms Cobalt Magnesium Titanium Zinc ```

Question 33

Best selection of a material

Answer 33

Best compromise between cost and properties