I have a question regarding the COMSOL simulation of PVDF-based nanocomposites. Specifically, I am interested in how can i defined the composite systems such as PVDF+nanoffilers in COMSOL. I am currently working with the strain-charge form, and I am in the process of including the experimental values of d₃₃ and εᵣ for each composite film in order to calculate their voltages. Regarding εᵣ, should I enter it under the 'Basic Definition' (εᵣ), or under εᵣT in the 'Strain-Charge Form or i have modifie Something else to define them correctly,

thank you very much.