Poisson Ratio Calculator

Calculate Poisson's ratio from lateral and axial strain measurements during uniaxial loading.

Poisson's Ratio (nu)

0.3000

Poisson's Ratio (nu) vs Lateral Strain (epsilon_lateral)

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Formula

## Poisson's Ratio When a material is stretched in one direction, it contracts in the perpendicular directions. Poisson's ratio quantifies this coupling between axial and lateral strains. ### Formula **nu = -epsilon_lateral / epsilon_axial** By convention, the negative sign makes nu positive for normal materials (since lateral strain is opposite in sign to axial strain). For this calculator, enter both strains as positive magnitudes. Most metals have nu between 0.25 and 0.35. Rubber approaches 0.5 (nearly incompressible).

Esempio Risolto

A steel bar shows 0.001 axial strain and 0.0003 lateral contraction strain.

  1. 01nu = 0.0003 / 0.001 = 0.3
  2. 02This is typical for steel (nu ≈ 0.28-0.33)