The Mechanical Damping subnode allows you to model mechanical losses in the
Piezoelectric Material and the
Magnetostrictive Material, either using loss factor material data for the stiffness, or in the form of Rayleigh proportional damping.
By default the Loss factor for elasticity matrix cE ηcE uses values
From material. For
User defined enter other values or expressions in the matrix.
This choice is only available if the Constitutive relation in the parent node is
Strain-charge form. By default the
Loss factor for compliance matrix sE ηcs uses values
From material. For
User defined enter other values or expressions in the matrix.
By default the Loss factor for elasticity matrix cH ηcE uses values
From material. For
User defined enter other values or expressions in the matrix
By default the Isotropic structural loss factor ηs uses values
From material. For
User defined enter another value or expression.
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. Note that the beta-damping is applied only to the mechanical part of the problem. To include the Rayleigh damping effect for the piezoelectric coupling terms, add a
Coupling Loss subnode.
Physics tab with Piezoelectric Material or
Magnetostrictive Material node selected in the model tree:
