Hooke’s Law

i. The modulus of elasticity is the slope of stress-strain diagram in the linearly elastic region

ii. Valid upto proportional limit only. Practically elastic and proportional limit are same.

1. Poisson’s Ratio,

          i.      The lateral strainat any point in a bar is proportional to the axial strain  at that same point if the material is linearly elastic.

            ii.       for all practical purpose 

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