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Properties
Definitions. OL question 2 and 3
Term | Definition |
---|---|
Define Hardness | A material with good resistance to scratching and wear. |
Define Toughness | A material with good resistance to impact and will not crack |
Describe Brittleness | A material that is very hard and will fail by cracking easily. |
Define ductility | A material which can be easily drawn into wire by making it thinner and longer |
Define malleability | A material that is easily stretched and shaped. This can be made easier by heating |
Describe Work Hardening | A material loses its ductility when bent or hit with a hammer and causes to become harder and more brittle |
Describe Elasticity | A material that can be stretched but will go back to its original length |
What is an insulator | A material that is a poor conductor of heat and electricity e.g PVC or Rubber coating on an electrical cable. |
What is a conductor | A material that will allow heat and electricity to pass through it easily |
Explain the term 'Melting point' | The temperature that a metal will start to turn from liquid to solid. |
Describe plasticity | A material that will not tear when deformed. |
Explain Creep (HL ques) | Failure of a metal which is under a constant load. It is subjected to tension causing elongation and fracture leading to failure. The rate of creep can speed up if the temperature of the metal increases |
Explain Fatigue. | Failure of a metal which is under a fluctuating load which leads to cracking and failure. Poor design can lead to fatigue failure. |