Hardness Factor
Hardness Factor
what are the factors that effect toughness and brittleness of an item?
what way the factor will affect the item e.g. will it become more tougher or more brittle?
what is hardness?
how can hardness be measured?
Tough materials do not undergo brittle fracture. An example of a tough material would be copper. If you bend copper it will deform plastically (permanently) and will not crack. Glass, on the other hand, is brittle. If a crack forms when glass is under tension, the crack will propogate through the material resulting in brittle fracture.
If you take a paperclip (tough) and work it backwards and forwards, it will eventually become brittle and fracture. This is called fatigue. The metal actually becomes HARDER but more BRITTLE.
Hardness is the resistance to a material becoming scratched or indented. Diamond is a very hard substance. You can measure hardness by finding out how easy it is to scratch a material.
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