Material properties

I am learning to…Describe the properties that are used to define the behaviour of engineering materials.

All List and describe the reason for 5 material tests

Most Describe how each test is conducted

Some Justify the importance of material testing

Material Properties:Describe how a material acts or behaves when being used.

• MECHANICAL

• ELECTROMAGNETIC

• CHEMICAL

Tensile Strength:The maximum load that a material can carry before it breaks.

MECHANICAL

The FORCE applied is measured in

Newtons!

Hardness:The hardness of a material is its resistance to wear. A hard material is difficult to cut.

MECHANICAL

Hardness:Hardness is measured by the Rockwell hardness test.

MECHANICAL

Toughness:A tough material is resistance to impact. Tough materials can absorb energy when something strikes them without breaking.

MECHANICAL

Toughness:If something is NOT tough it is Brittle

MECHANICAL

Toughness:Toughness is tested by the Charpy Test.

MECHANICAL

Malleability:A material is malleable if it can be easily pressed or forged into shape.

MECHANICAL

Malleability:Some materials are malleable when cold, others have to be pressed into shape.

MECHANICAL

Conductivity:The ability of a material to allow electricity to flow through it.

ELECTROMAGNETIC

Ohm (Ω)

Conductivity is measured as resistance!

Conductivity:ELECTROMAGNETIC

Steel

Water

WoodCeramic

Conductivity:ELECTROMAGNETIC

1 2

4 3

Conductivity:ELECTROMAGNETIC

Conductivity:ELECTROMAGNETIC

Conductivity:ELECTROMAGNETIC

Conductivity:ELECTROMAGNETIC

Conductivity:ELECTROMAGNETIC

Corrosion Resistance:Some metals go rusty and eventually will corrode away completely.

CHEMICAL

Corrosion Resistance:Rust occurs when the iron is exposed to oxygen and water.

It is the formation of red oxides which corrode the material.

CHEMICAL

Corrosion Resistance:CHEMICAL

Corrosion Resistance:CHEMICAL

Which metals rust the quickest?

Steel Aluminium StainlessSteel

Copper

Solvent Resistance:Some rubbers and plastics are attacked by certain chemicals.

These chemicals are called solvents.

CHEMICAL

Solvent Resistance:CHEMICAL

Environmental Resistance:If unprotected, wood will rot when exposed to water.

Wood becomes more durable when painted or treated with chemicals.

CHEMICAL

Why do we have material tests?

Question 1:Name a component of a BMX that must perform well for each property:

a) Good tensile strength

b) Hardness

c) Flexibility

d) Solvent resistance

Question 2:What material properties do you think the following workshop items should have?

Chisel Soldering iron bitHand file Screwdriver

Question 3:What material properties do you think the following domestic items should have?

Saucepan Washing up bottleKitchen Knife Radiator

Question 4:What material properties do you think the following outdoor items should have?

Electrical Cables Motorway barriersWater pipes Railway Lines