On the basis of experiments, Hooke proposed that for smaller values of strain, within a certain limit specific to material, the stress produced in material is proportional to the strain
It is defined as ratio of tensile or compressive stress i.e. axial stress to the longitudinal strain i.e.
If a rod of length L and area of cross-section A is pulled by normal forces F, then
Tensile stress = FIA
Longitudinal strain =
and Young's modulus Y =
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