Figure 1.

(a) The pull-in instability occurs in an unconstrained thermoplastic film sandwiched between two compliant electrodes. (b) The creasing-cratering instability occurs in a thermoplastic film constrained by a thick rigid electrode on one of its surface. The calculated critical electric fields for the (c) pull-in instability and (d) creasing-cratering instability as functions of $Y/{\sigma }_0$ and n.