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Poisson's Ratio

Definition: When a material is stretched, its cross-sectional area changes as well as it length. Poisson's Ratio is the constant relating these changes in dimensions and is obtained by dividing the change in width per unit length by the change in length per unit length as given by the equation:

This is restricted to small elongations. For rubbery materials,ν is close to 1/2, while for crystals and glasses ν is about 1/4 to 1/3.

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