Question

Define Poisson's ration and show that value is less then 0.5
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Answer 1

So the Poisson's ratio, which is defined as negative ratio of lateral strain to longitudinal strain, will be 0.5. Physically a material can not contract in volume when stretched, the maximum value of Poisson's ratio can't therefore be more than 0.5. ... This means the Poisson's ratio in this situation will be zero

Answer 2

Answer:

Poisson's ratio is a measure of the Poisson effect, the phenomenon in which a material tends to expand in directions perpendicular to the direction of compression. ... A perfectly incompressible isotropic material deformed elastically at small strains would have a Poisson's ratio of exactly 0.5.