- #1

etotheipi

*piezoelectric coefficient*. But for the general piezoelectric we have the constitutive equations$$\begin{align*}

\sigma_{ij} &= c_{ijkl} S_{kl} - e_{kij} E_k \\

D_k &= e_{kij} S_{ij} + \epsilon_{ki} E_i\end{align*}$$with ##\sigma_{ij}## the stress tensor, ##S_{ij}## the strain tensor, ##\epsilon_{ij}## the dielectric tensor, ##c_{ijkl}## elastic constants, ##e_{jik}## piezoelectric constants and ##E_i## & ##D_i## as usual. Does anyone have reference to derive these equations? I don't know anything about elasticity theory. Thanks