# Stiffness

### Glossary Term

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Stiffness is the resistance to elastic deformation due to applied forces or moments.
In engineering mechanics, stiffness is a value that describes the resistance a body can provide against deformation due to external action (torque or force).

The stiffness depends on the following factors:
• Geometry of the solid
• Material properties (modulus of elasticity and shear modulus)
A distinction is generally made between different stiffnesses, such as strain, torsional and bending stiffness. The distinction depends on the type of load. The reciprocal of the stiffness is the compliance.

#### Keywords

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• Updated 02/22/2021