Stress strain graph for various types of steel/material
All the grades of steel have the same Young’s modulus but different yield stresses.
where, σ= Stress,
Ductile material : If post elastic strain is greater than 5%. It is called ductile material. They undergo large permanent strains, large reduction in area before fracture.
- e.g. Lead, mild steel, copper
Brittle Material : If post elastic strain is less than 5%. It is called brittle material.
- Fail with only little elongation after the proportional limit is exceeded.
- Very less reduction in area before fracture
- e.g. Bronze, glass
- ‘Mild steel’ more elastic than ‘Rubber’. (as Esteel > Erubber)
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