Characterization and evaluation of piezoelectric composite bimorphs forin‐situacoustic emission sensors

Abstract

Aberdeen Proving Ground, Maryland 21 005-5069Mixed connectivity composites consisting of a ferroelectric ceramic powder of calcium modified lead titanate dispersed in a polymer matrix have been fabricated into piezoelectric bimorph sensors. The piezoelectric, dielectric and electromechanical coupling coefficients of these sensors have been measured and a full characterization of the electromechanical properties are reported. The suitability of these bimorph transducers as in-situ acoustic emission sensors, embedded into glassepoxy laminate plate like structures, has been investigated. A comparison of the performance of these sensors to those of previously investigated monomorph sensors fabricated from the same material has been made. SCIENCE, MARCH 1999, V d . 39, No. 3 508 POLYMER ENGINEERING AND

Poled Polyaniline Coated Piezo Composite Using Low Electric Field and Reduced Poling Time: A Functional Material

“…To simulate the AE source, pencil lead was broken on the surface of the plate. This is the conventional Hsu-Nielsen [13] method which obeys the ASTM standards.…”

Interpenetrating Composites

“…Wenger et al investigated the potential of such composites with 0-3 and 1-3 connec-tivity [14][15][16][17]. Wenger et al investigated the potential of such composites with 0-3 and 1-3 connec-tivity [14][15][16][17].…”

Use of piezoelectric as acoustic emission sensor for in situ monitoring of composite structures

“…They have demonstrated that the SNS could become part of an Integrated Health Monitoring System for metallic/composite structures including wind turbines and aircraft. Wenger et al [26] investigated the suitability of piezoelectric bimorph sensors as insitu acoustic emission sensors, embedded into glass epoxy laminated plate. The bimorphs have essentially differentiated between the two types of plate wave propagation, although the differentiation has been determined by the wavelength of the acoustic wave compared to the sensor dimensions.…”