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The figure shows the stress-strain curves for two materials A and B. From these curves we can conclude that:

1. A is brittle but B is ductile
2. A is ductile and B is brittle
3. both A and B are ductile
4. both A and B are brittle

Correct answer: A is ductile and B is brittle

Solution

In the standard diagram, material A shows a long plastic region before fracture (ductile) while material B fractures shortly after the elastic limit (brittle).

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