Testing materials - Reece
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What are the six terms used to describe a solid?
- - Brittle
- - Ductile
- - Malleable
- - Hard
- - Stiff
- - Tough
What is meant by the term brittle?
If you apply a force to a brittle material, it WILL NOT deform plastically. However if there is enough force applied it will suddenly snap, they are also quite weak if they have cracks in them. e.g a chocolate bar is a brittle material - Break individual chunks of chocolate without the whole bar changing shape. Also ceramics (glass) shatter.
What is meant by the term ductile?
- - You can change the shape of ductile materials
- - They keep their shape when there deformed in this way.
- - An example of a ductile material is copper
- - Ideal for electric wires
What is meant by the term malleable?
- - Their shape can be changed fairly easily e.g hammering or rolling
- - Malleable materials will not keep their strength
- - Gold is an exaple of a malleable metal
What is meant by the term hard?
They are very resistant to cutting, indentation and abrasion
- They can be used as cutting tools often made by harden steel and diamond
What is meant by the term stiff?
Stiff materials have a high resistance to bending and stretching
- Changing the shapes of stiff materials
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