Modeling and Computer Design of Piezoceramic Materials with Stochastic Microporous Structure and Local Alloying Pore Surfaces

摘要

The paper considers the technique of determining effective characteristics of microporous piezoceramic material with random porosity and local alloying (metallized) pore surfaces. The presented investigation is based on a complex approach, which included the effective moduli method for the mechanics of composites, modeling of representative volumes with closed porosity and with local metallized pore surfaces and the finite element method. Static problems of the piezoelectricity theory for an inhomogeneous representative volume were solved numerically with the help of ANSYS finite element package and special programs written in ANSYS APDL. To simulate the metallization of the parts of porous borders the boundary conditions of free electrodes were used. The influence of the local alloying pore surfaces on the values of the most important effective moduli was investigated numerically for microporous piezoceramic PZT-4. The computation results have shown that microporous piezoce-ramics with local metalized pore surfaces has a range of extreme properties perspective for practical applications.