Mechanical Damping
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.
Damping Settings
Select a Damping typeLoss factor for cE, Isotropic loss factor, or Rayleigh damping.
Loss Factor for cE (Piezoelectric Material)
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.
Loss Factor for sE (Piezoelectric Material)
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.
Loss Factor for cH (Magnetostrictive Material)
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
Isotropic Loss Factor
By default, the Isotropic structural loss factor ηs uses values From material. For User defined enter another value or expression.
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. 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.
Location in User Interface
Context Menus
Ribbon
Physics tab with Piezoelectric Material or Magnetostrictive Material node selected in the model tree: