draw a stress stain graph of metal and mention it's important features in it
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Answer:
The stress is proportional to strain upto point, where, Hooke's law is fully obeyed. Point A is known as proportional unit. When stress is increased beyond A, then for a small stress there in large strain in the wire upto B. When the load is reduced between points O and B, then the wire comes back to its original position. The wire regains its original position only when load applied is less than or equal to certain limit. This limit is called elastic limit. The point B on the curve is known as elastic limit or yield point. But, if the stress is increased beyond B, the strain further increases and the wire does not come back to its original position after removing load. It is deformed permanently. As the stress in further increased beyond C, there is a large strain in the body and the wire breaks at point E called fracture point.