The four state variables
can be rearranged to give an additional 3 forms for a piezoelectric constitutive equation.
Instead of the coupling matrix
d, they contain the coupling matrices
It is possible to transform piezo constitutive data in one form to another form.
Why are these transformations important? A leading motivation is that
vendors typically publish material data for
g, whereas certain finite element
codes require piezo data entered as
To view the 4 piezoelectric constitutive equations and their mutual transformations,
visit the Constitutive Transform page.