Mechanical and electromechanical properties of calcium-modified lead titanate/poly(vinylidene fluoride-trifluoroethylene) 0-3 composites

摘要

Abstract: Thin film composite sensors have been fabricated which incorporate piezoelectric ceramic particles in an polymer matrix. These composites are more compliant than pure piezoelectric ceramics and can be embedded in thick structures to monitor internal mechanical conditions, such as the evolution of damage. Composite films consisting of Ca-modified lead titanate particles in a poly(vinylidene fluoride-trifluororethylene) matrix are examined in this paper. The viscoelastic properties of these composites (with various volume fractions, up to 60% ceramic) have been measured over a range of frequencies (0.01 to 100 rad/sec). The complex h$+*$/$-31$/ piezoelectric coefficient has also been measured for these composites for various volume fractions and over a frequency range from 5 to 100 rad/sec. The magnitudes and phase angles of the piezoelectric coefficients are shown to be highly frequency dependent.!21