1. Material Properties Lesson 1

2. Knowledge of material properties application design of components material protection (from corrosion, damage, etc.)

3. Materialproperties 1. Physical properties 2. Mechanical properties 3. Chemical properties

4. Physicalproperties colour –light wave length specific heat – the heat required to raise the temperature of one gram of a substance by one degree centigrade (J/kg K)

5. Physical properties density– massperunitvolumeexpressedinsuchunits as kg/cm 3 thermalconductivity–rate at whichheatflowsthrough a givenmaterial (W/m K)

6. Physical properties melting point – a temperature at which a solid begins to liquify electrical conductivity – a measure of how strongly a material opposes the flow of electric current (Ω⋅m)

7. coefficient of thermal expansion – degree of expansion divided by the change in temperature (m/°C)

8. Mechanical properties tensile strength – measures the force required to pull something such as rope,wire or a structural beam to the point where it breaks ductility – a measure of how much strain a material can take before rupturing

9. malleability – the property of a material that can be worked or hammered or shaped without breaking brittleness –breaking or shattering of a material when subjected to stress (when force is applied to it)

10. elasticity – the property of a material that returns to its original shape after stress (e.g. external forces) that made it deform or distort is removed plasticity - the deformation of a material undergoing non-reversible changes of shape in response to applied forces

11. Mechanical properties toughness – the ability of a material to absorb energy and plastically deform without fracturing hardness – the property of being rigid and resistant to pressure; not easily scratched

12. Mechanical properties machinability – the property of a material that can be shaped by hammering, pressing, rolling

13. Chemical properties corrosion resistance - a material's ability to resist deterioration caused by exposure to an environment

14. Whichproperties do thefollowing materials possess?

15. Whichproperties do thefollowing materials possess?

16. Findapplication for thefollowingengineering materials:

17. Findapplication for thefollowingengineering materials:

18. materialwithgreatestdensity gold - 19300 kg/m3 uranium - 19100 kg/m3 lead - 11340 kg/m3 steel - 7800 kg/m3

19. thestrongestmaterial

20. the best conductor

21. the best insulator

22. Processes: Forging - a manufacturing process where metal is shaped by plastic deformation under great pressure into high strength parts. Casting – pouringor injecting molten metal into a moldcontaining a cavity with the desiredshape