The value of Poisson’s ratio is always

Explanation:

• Poisson's ratio is the ratio of transverse contraction strain to longitudinal extension strain in the direction of the stretching force.
• The value of Poisson’s ratio depends on the type of material i.e. material of the test specimen.
• Most materials have Poisson's ratio values ranging between 0.0 and 0.5.
• A perfectly incompressible material deformed elastically at small strains would have a Poisson's ratio of exactly 0.5.
• Most steels and rigid polymers when used within their design limits (before yield) exhibit values of about 0.3, increasing to 0.5 for post-yield deformation which occurs largely at constant volume.
• Rubber has a Poisson ratio of nearly 0.5.
• Cork's Poisson ratio is close to 0, showing very little lateral expansion when compressed.