# Rotational stiffness

## Description

The stiffness of a body is a measure of the resistance offered by an elastic body to deformation. A body have a rotational stiffness when it is in a rotational movement and is depended on the applied moment and the angle of the rotation.

The stiffness of a body is a measure of the resistance offered by an elastic body to deformation. For an elastic body with a single degree of freedom (for example, stretching or compression of a rod), the stiffness is depended on the force applied on the body and the displacement produced by the force.

(The degree of freedom (DOF) of a mechanical system is the number of independent parameters that define its configuration.)

A body may have a rotational stiffness depended on the angle of the rotation and the applied moment.

## Variables

k | Rotational stiffness (N*m/radians) |

M | Applied moment (N*m) |

θ | The angle of the rotation (radians) |