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.

Select Input parameters — Alpha and beta — to enter the damping parameters explicitly, or Damping ratios to derive the damping parameters from the damping ratio at two frequencies.

When Alpha and beta is selected, enter values or expressions for the Mass damping parameter αdM and the Stiffness damping parameter βdK.

When Damping ratios is selected, enter two pairs of frequencies, f1 and f2, and the corresponding damping ratios ζ1 and ζ2 at these frequencies. The Rayleigh damping parameters are then computed as

In order to visualize the damping ratio as a function of frequency, click Damping Ratio Preview ().

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