Knowing the Poisson’s Ratio for different materials helps us determine the ideal purpose for that material. Poisson’s Ratio Values for Different Material \ = −\Īs observed from the formula of Poisson Ratio, the Poisson’s Ratio of an object is directly proportional to lateral strain and inversely proportional to axial strain.īased on the Poisson's Ratio equation, further calculations are carried out. The length of the rubber increases by the amount of dL and the breadth increases by dB. The original length and breadth of the rubber, which is L and B respectively when pulled longitudinally, gets compressed laterally. When a piece of rubber is in its original shape which is a cuboid and is pulled along its sides what happens? The rubber will get compressed from the middle.