Using the Damping subnode, you can add damping to the material model. Damping can be used in Time Dependent, Eigenfrequency, and Frequency Domain studies; for other study types, the settings in the Damping subnode are ignored.

You can add the Damping subnode to the Linear Elastic Material node.

The Damping type is always Rayleigh damping.

Enter the Mass damping parameter αdM and the Stiffness damping parameter βdK.

In this damping model, the damping parameter ξ is expressed in terms of the mass m and the stiffness k as

That is, Rayleigh damping is proportional to a linear combination of the stiffness and mass; there is no direct physical interpretation of the mass damping parameter αdM and the stiffness damping parameter βdM.

Physics Tab with a Linear Elastic Material node selected in the model tree: Attributes>Damping