Is the value of K^2 (Electromechanical coupling) the same in both directions ?

[5carola5]

I want to know for a project for school if the value Electromechanical coupling coefficient of piezoelectric material will be the same in both directions? (from machanical to electric and from electric to mechanical)

So in formula from:

Em=Ee * K^2 and Ee=Em * K^2

and not something like:
Em=Ee * K1^2 and Ee=Em *K2^2

thanks in advance !

 

[member 553083]

In general, the electromechanical coupling coefficient of piezoelectric material will be the same in both directions. The K coefficient is a constant that represents the ratio of electric to mechanical strain. Therefore, it should remain consistent regardless of the direction of the conversion.