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NUMERICAL AND EXPERIMENTAL MODELING OF THE ACOUSTIC-ELECTRICAL METHOD FOR NON-DESTRUCTIVE TESTING OF SOLID-STATE DIELECTRICS

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Abstract. To develop a complex acoustoelectric method for non-destructive testing, mechanoelectric and acoustoelectric transformations are numerically and experimentally studied on the example of magnetite ore samples and model defective dielectric structures based on cement-sand mixtures. Results of calculations of stress concentration at cracks of different sizes during an external deterministic acoustic pulse propagation along the sample are presented. Results of experimental studies of electromagnetic emission of samples of magnetite ore containing calcite and magnetite under uniaxial compression to fracture are demonstrated. The possibility of reliable determination the appearance and development of destructive zones in dielectric materials from the spectra of electromagnetic responses during acoustoelectric transformations is revealed. Results concerning changes in parameters of electromagnetic responses of a cement-sand mixture with defects under external pulsed acoustic action in the process of stepwise loading by compression and shear are presented. As inclusions (defects), magnetite ore and fluoroplastic are used, which have, respectively, a higher and lower acoustic impedance than the model sample material. The effect of duration of external pulsed acoustic excitation on parameters of electromagnetic responses during stepwise loading of model samples is considered.

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