Title :
New constitutive equations with internal coupling in piezocomposites
Author :
Alvarez-Arenas, Tomás E Gòmez ; De Espinosa, Francisco Montero
Author_Institution :
Inst. de Acustica, CSIC, Serrano, Spain
Abstract :
A new theoretical frame is presented for the study of the elastic, dielectric and piezoelectric properties of two-phase piezoelectric composite materials of complex microstructure. Beginning from basic thermodynamic relations, new general constitutive relations for a two-phase composite have been obtained. These new constitutive equations consider in a general and novel way the dielectric and elastic interaction between the composite´s components. This approach was successfully applied to the study of porous ceramics, and now its applicability to the study of piezocomposites will be analyzed. Some measurements of 3-3 composites´ dielectric and mechanical properties are presented and compared with the results of porous piezoceramics. The existence and influence of these couplings is clearly observed
Keywords :
composite materials; elastic moduli; permittivity; piezoceramics; piezoelectric transducers; porous materials; basic thermodynamic relations; complex microstructure; constitutive equations; dielectric properties; elastic interaction; internal coupling; mechanical properties; piezocomposites; piezoelectric properties; porous ceramics; two-phase piezoelectric composite materials; Ceramics; Composite materials; Dielectric losses; Dielectric materials; Dielectric measurements; Equations; Mechanical variables measurement; Piezoelectric materials; Strain measurement; Stress;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495718
