Expain engineering and true stress strain graphs and different regions in it

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Explanation of engineering and true stress strain graphs and their different regions.

Engineering stress-strain graph shows the relationship between stress and strain during deformation of a material.
True stress-strain graph takes into account the reduction in cross-sectional area of the specimen during deformation.
The different regions in the graph are elastic region, yield point, plastic region, necking and fracture.
Elastic region is where the material behaves elastically and returns to its original shape when the stress is removed.
Yield point is the point where the material starts to deform plastically.
Plastic region is where the material undergoes permanent deformation.
Necking is the region where the material starts to reduce in cross-sectional area.
Fracture is the point where the material fails.
The graphs are important in understanding the mechanical properties of materials and designing structures.

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