# Shear modulus (related to Young's modulus and Poisson's ratio)

## Description

The shear modulus is one of several quantities for measuring the stiffness of materials and describes the material’s response to shear stress (like cutting it with dull scissors). Young’s modulus describes the material’s response to linear stress (like pulling on the ends of a wire). Poisson’s ratio is the negative ratio of transverse to axial strain. When a material is compressed in one direction, it usually tends to expand in the other two directions perpendicular or parallel to the direction of flow. This phenomenon is called the Poisson effect. Poisson’s ratio is a measure of this effect.

Related formulas## Variables

G | Shear modulus (Pa) |

E | Young's modulus (Pa) |

ν | Poisson's ratio (dimensionless) |