PZT manufacturers often put electromechanical coupling coefficient (k) [dimensionless] in their data sheets. This coefficient shows how much electrical energy converted into mechanical energy, and vice versa.
In COMSOL, what is the correct way to take into account of this coefficient? Is it necessary to input this coefficient in any way if I already defined the piezoelectric charge constant (d) [m/V]?
As an example of the datasheet from PZT manufacturers, see: http://www.ctscorp.com/components/pzt/downloads/Piezoelectric_Navy_Type1.pdf
Note that here the term "coupling factors" is used instead of "electromechanical coupling coefficient".
Another datasheet: http://www.suasis.com/wp-content/uploads/Catalog/Ceramics.PDF