A. V. Nasedkin

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The paper presents the Mathematical models of reversible and irreversible processes in the polycrystalline ferroelectric materials (ceramics) for a computational finite element package ACELAN. Irreversible processes are described by the nonlinear models of polarization and depolarization by an electric field and mechanical stress. New release of ACELAN is(More)
Porous piezoelectric ceramics are important for a variety of applications such as medical ultrasonic devices, non-destructive testing, underwater acoustics etc. In this paper a line of proprietary porous piezoelectric ceramics with 3-0/3-3 connectivity types were systematically studied. Complex sets of elastic, dielectric and piezoelectric coefficients of(More)
The paper considers a focusing piezoelectric transducer in the form of a spherical segment with technological hole in the center and with separated electrodes. This transducer is designed to generate high-intensity ultrasonic fields with controllable characteristics in the focal spot in the external acoustic medium. In order to enhance the efficiency of the(More)
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