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Nominal Stress-Strain Curve in Uniaxial Tension
0 Nominal stress Nominal Strain 1 2 3 4 plastic elastic strain strain
1.Initial elastic deformation caused by simple stretching of bonds. This obeys Hooke's Law.

2.The Yield Point is the stress level at which plastic deformation first occurs.

3.Plastic Flow. Slip occurs on glide planes by the passage of dislocations.

4.Elastic strain recovery. Non-permanent elastic deformation is recovered upon release of a mechanical stress.