Damping

Material damping is specified according to the following equation:

α R 2 ω i + β R ω i 2 ,
where ω i are the natural frequencies of the model on which the material is applied.

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In Other Guides
Material Damping
Input Data Description
Alpha The mass proportional damping factor; this factor tends to have a stronger effect at lower frequencies.
Beta The stiffness proportional damping factor; this factor tends to have a stronger effect at higher frequencies.
Structural The structural damping factor. Use this factor only when the displacement and velocity are exactly 90° out of phase; otherwise, it should be zero. Structural damping assumes that the damping forces are proportional to the forces caused by stressing of the structure and are opposed to the velocity.