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
I am not familiar with COMSOL but I have worked with Abaqus on multiphysics problems. I think the principle should be the same. What you need is to define your material as a piezoelectric material. You can then insert the electromechanical coupling term as a parameter in the material model. Hope this helps.
I think You may help the article Peng Zheng and et. al. "Multiphysics Simulation of the Effect of Sensing and Spacer Layers on SAW Velocity" http://www.comsol.com/paper/download/101051/Zheng.pdf
Hi Nejib. Piezoelectric constants (d) parameter is readily available for piezo model in Comsol, I can make it user defined. No problem.
However, different case for electromechanical coupling coefficient. Which property did you use in Abaqus?
To make the problem clearer, I edited the question. Please take another look.
Hi Firdaus. I am not perfectly sure of what you mean of you mean by your question but these are some details. Piezoelectric materials can be defined either by constant-stress piezoelectric coupling tensor or by constant-strain piezoelectric coupling tensor. Both can be used and it depends on the parameter you are using. It actually depends on the constitutive behavior you are using to model your the piezo material. This funny presentation gives more details.
https://prezi.com/vmjsceycpxfk/constitutive-model-of-piezoelectric-material/
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