Question

What is the value of Poisson's ratio for rubber?
1. 0.5
2. 0.22
3. 0.3
4. 0.15

Answer 1

Correct Answer - Option 1 : 0.5

Explanation:

Poisson's ratio:

• Poisson's ratio is the ratio of transverse strain to longitudinal strain i.e. \(\rm{\nu = - \frac{{{\epsilon_{lateral}}}}{{{\epsilon_{longitudinal}}}}}\)
• Most materials have Poisson's ratio values ranging between 0.0 and 0.5 (mostly 0.33).
• Poisson's ratio of a perfectly incompressible material has a value of 0.5 and rubber behave like incompressible i.e. if we stretch its length increases and width decreases proportionally so its volume remains the same. As a result, the rubber has a Poisson's ratio of 0.5.
• Some common material and their Poisson's ratio like Stainless steel: 0.30–0.31, Steel: 0.27–0.30, Cast iron:0.21–0.26, Cork: 0.0, Rubber: 0.5.

• For a rigid body, the value of Poisson’s ratio is zero.
• A zero Poisson’s ratio means that there is no transverse deformation resulting from an axial strain.
• Cork's Poisson ratio is close to 0, showing very little lateral expansion when compressed.