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Why does the stress strain curve of mild steel suddenly falls after higher yield point?
Is necking a common phenomenon in all materials under tensile loading?
No, necking is not a common phenomenon in all materials under tensile loading. In ductile materials, such as mild steel, necking occurs because the material can undergo significant plastic deformation before fracturing. In contrast, brittle materials, such as ceramics, do not experience necking because they fracture before significant plastic deformation can occur.