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Material Properties

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Material Properties Learning Intention: Understand the terms used to describe the properties of materials Check your understanding the ability of a material to ... – PowerPoint PPT presentation

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Title: Material Properties


1
Material Properties
  • Learning Intention
  • Understand the terms used to describe the
    properties of materials

2
Material Properties
  • Different materials have different properties
  • Designers have to consider these properties when
    selecting the most suitable material for a
    specific product

3
Selecting Appropriate Materials
  • When mass producing a product you would need a
    material that can be permanently shaped and
    easily formed

4
Selecting Appropriate Materials
  • If you were building a bridge, you would need a
    material with the ability to withstand high forces

5
  • When describing a materials properties we can
    refer to either its Mechanical Properties or its
    Physical Properties

6
Mechanical Properties
  • The Mechanical Properties of materials are linked
    to how they react to the application of force

7
Types of Force
8
Mechanical Properties - Strength
  • The strength of a material is its ability to
    withstand an applied force without breaking or
    bending permanently

Materials can have different types of strength
thinking of the different types of force what do
you think they are? Heres the first one
9
Tensile Strength
10
Bending Strength
11
Compressive Strength
12
Shear Strength
13
Torsion Strength
14
Mechanical Properties - Hardness
  • The ability of a material to resist abrasive wear
    or scratching

15
Mechanical Properties - Density
  • The mass per unit volume often has an effect on
    other properties such as hardness

16
Mechanical Properties - Durability
  • The ability to resist wear and tear (over a
    period of time, materials begin to weather and
    suffer wear and tear

17
Mechanical Properties - Toughness
  • The ability to withstand sudden shocks or blows
    without breaking

18
Mechanical Properties - Brittleness
  • The opposite of toughness little or no
    resistance acrylic is very brittle unless heated

19
Mechanical Properties - Malleability
  • The ability of a material to be permanently
    deformed in all directions hammering, rolling
    or pressing

20
Aluminium Cans
21
Mechanical Properties - Elasticity
  • Ability to flex and bend but return to original
    form when force is removed

22
Mechanical Properties - Ductility
  • Ability of a material to be cold-formed by being
    pulled (drawn) into thinner sections of wire
    (without breaking)

23
Physical Properties
  • The Physical Properties of materials are
    unaltered by the application of force

24
Physical Properties - fusibility
  • Ability of a material to change into a liquid at
    a certain temperature important for fabrication
    and forming processes

25
Physical Properties thermal conductivity
  • Ability to allow heat to pass through a material

26
Physical Properties Electrical conductivity
  • Ability to allow electricity to pass through the
    material

27
Physical Properties Environmentally friendly
  • Materials that can be reused, recycled or are
    biodegradable

28
  • Examiners Tip
  • You must be able to describe the properties of
    materials
  • Be able to describe the terms used in relation to
    a variety of materials using notes and sketches

29
Homework Task
  • Design some simple tests you could carry out in
    the school workshop to find out the relative
    properties of a range of materials

30
Check your understanding
  • the ability of a material to conduct heat or
    electrical energy
  • ?

31
Check your understanding
  • Give an example of a material with good thermal
    conductivity
  • ?

32
Check your understanding
  • Give an example of a material that is a good
    thermal insulator
  • ?

33
Check your understanding
  • Give an example of a material that is a good
    electrical insulator
  • ?

34
Check your understanding
  • the ability of a material to withstand a force
    without breaking or bending
  • ?

35
Check your understanding
  • Why would this I beam be used?

36
Check your understanding
  • the ability of a material to bend and then to
    return to its original shape and size
  • ?

37
Check your understanding
  • Many wooden tool handles and sports equipment are
    made from Ash. Why?

38
Check your understanding
  • the ability of a material to permanently deform in
    all directions without cracking
  • ?

39
Check your understanding
  • Give an example of a malleable metal

40
Check your understanding
  • the ability of a material to deform, usually by
    stretching along its length
  • ?

41
Check your understanding
  • Name a metal that is ductile what is it used to
    make?
  • ?

42
Check your understanding
  • the ability of a material to resist wear,
    scratching and indentation
  • ?

43
Check your understanding
  • the ability of a material to withstand blows or
    sudden shocks without breaking
  • ?

44
Check your understanding
  • Whats the opposite of tough? Give some examples
  • ?

45
Check your understanding
  • is the ability of a material to withstand wear,
    especially as a result of weathering
  • ?

46
Check your understanding
  • the ability of a material to change into a liquid
    or molten state when heated to its melting point
  • ?
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