The formula to calculate Poisson's Ratio (P) is:
\[ P = -\frac{\epsilon_{\text{trans}}}{\epsilon_{\text{axial}}} \]
Where:
Poisson's Ratio is a measure of the deformation of a material in directions perpendicular to the direction of loading. It is defined as the negative ratio of transverse to axial strain.
Consider an example where:
Using the formula to calculate Poisson's Ratio:
\[ P = -\frac{0.002}{0.001} = -2 \]
This means that the Poisson's Ratio for this example is -2.