Stress - Strain Diagram for a ductile material
- L = the limit of proportionality, Hooke’s law applies up to this point.
- E = elastic limit, beyond this point the material is permanently stretch and it will not go back to its original length. Elastic behaviour is when a material returns to its original length, plastic behaviour is when the stretched material does not return to its original length.
- Y = yield point, beyond this point small increases in force give much big increases in length.
- B = breaking point / breaking stress, the material breaks at this point.
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