Stretch strain graphs Watch

Hellospaceboyy
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Explain the meaning of the terms brittle and ductile and explain the stress strain graphs

Please can someone help me with this question? I know the definitions of the words but I don't understand what the stretch strain graphs show
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c471
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(Original post by Hellospaceboyy)
Explain the meaning of the terms brittle and ductile and explain the stretch strain graphs

Please can someone help me with this question? I know the definitions of the words but I don't understand what the stretch strain graphs show
I think you will find it is stress strain not stretch strain.

http://en.wikipedia.org/wiki/Stress%...93strain_curve
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Hellospaceboyy
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(Original post by c471)
I think you will find it is stress strain not stretch strain.

http://en.wikipedia.org/wiki/Stress%...93strain_curve
typo sorry
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Necrosyrtes
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For the definitions, we have:
Ductile - Undergoes large amounts of plastic deformation before breaking, i.e. you can stretch it out into a wire without breaking it. An example of a ductile material would be copper, which is drawn out into wires.
Brittle - Undergoes little or no plastic deformation before breaking, i.e. you can't really stretch it or change the shape of it without breaking it. An example of a brittle material is porcelain which you can't stretch out really, it will just break.
It's definitely worth learning these definitions, and the other ones about material (like malleable etc.) off by heart, and making sure you understand them.

If you understand what plastic deformation looks like on a stress-strain graph, you should be able to answer this question now. The graph of a brittle material will show little/no plastic deformation, but the graph of a ductile material will show a lot of plastic deformation.

If you're still stuck take a look at this website:
http://physicsnet.co.uk/a-level-phys...stress-strain/
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