User talk:Monirulalam560

Poisson's Ratio
Within the elastic limit, the lateral strain (β) is proportional to the linear strain(∝) for the material of a given body and the ratio the two is a constant, called poisson's ratio for the material.

It is denoted by σ and in engineering practice, usually by 1/m

∴    poisson's ratio σ=β/α=1/m or, secondary strain/primary strain=σ=1/m

It follows, therefore, that

a) If a body under tension suffers no lateral contraction, the value of poisson's ratio(σ or 1/m) for it is zero,and, because it is volume density must increase.