draw and explain stress strain graph for a metallic wire
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Answer:
The stress-strain graph for a metal wire is given in figure, upto the point B, the wire returns to its original state O along the curve BAO, when it is gradually unloaded. Point E corresponds to the fracture point of the wire. ... stress-strain curve.
When a metal wire of equal cross-section is exposed to an increasing load, the curve depicts the variation in stress with strain.
The Proportionality Zone OA is a straight line, indicating that stress is linearly proportional to the strain in this region and the body behaves as if it were perfectly elastic.
Elastic Limit: When the strain is increased slightly further Than A, the stress is just no longer directly proportional to the strain. However, the wire retains its elasticity, i.e., it returns to its previous state after the mechanical force (load) is removed.
Elastic limit refers to the highest amount of strain where a body (wire) exhibits elastic properties. A body acts like a plastic body once it reaches its elastic limit.