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Why does the stress strain curve of mild steel suddenly falls after higher yield point?
Can you explain what necking is and how it affects the stress strain curve?
Necking is the localized reduction in cross-sectional area of the material. It occurs due to the non-uniform deformation of the material under tensile loading. As necking takes place, the stress in the region of the neck increases rapidly, causing the overall stress in the material to decrease. This causes the sudden fall in the stress strain curve after the higher yield point.