Relation b/w stress & strain for wire

Relation b/w stress & strain for wire

The relationship between stress and strain in a wire is illustrated by the graph shown in the adjoining figure. The regions are referred to as follows:

OA = Elastic region, Hooke’s law is valid.

AB = Elastic region, Hooke’s law is not true

A = proportional limit

B = Elastic limit(strain ≤ 1 %) or yield point

BD = Plastic deformation

OE = Permanent set

CD = Plastic flow

D = Fracture point (Corresponding stress is called breaking stress/ tensile strength)

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