Anomalous mechanical and piezoelectric coefficients in piezoceramics used for ignition

An analysis of impact igniters is developed following the classical electromechanical analogies. From a comparison of the model with the experimental characterization of the converter, unusually high values of S/sup E//sub 33/, d/sub 33/, in /sup T//sub 33/ coefficients are shown. Furthermore, a significant increase of the loss tangent occurs under dynamic compression. The influence of applied uniaxial stress, the size of the piezoceramics, and their composition are studied.<>