Development prospects for nondestructive testing of heterogeneous nonmetallic materials by the parameters of electrical response to a shock action

Testing of Solid State Defects With Different Magnetic Properties in Dielectric Structures by the Parameters of Electromagnetic Response to Acoustic Excitation

“…This has a significant effect on the parameters and propagation of deterministic acoustic pulses in defect samples and on the parameters of the excited electromagnetic responses at the interface between the sample and the defect during acoustic-electric conversions [39]. Excitation of electric double layers (EDL) by acoustic pulses causes EMS emission, and EMS parameters are determined by the characteristics of the acoustic impact and acoustic and electrical properties of the material [23][24][25][26]39]. The study of electromagnetic responses to deterministic acoustic excitation of CSM samples containing ferromagnetic inclusions (carbon steel), diamagnetic inclusions (LS59 brass) and paramagnetic inclusions (D16T duralumin) showed that the parameters and spectra of the recorded EMS depend on the ratio of the acoustic impedance of the CSM samples and defects in them.…”

“…In [23][24][25][26], it was revealed that impact of the acoustic wave causes EMS formation as a result of the oscillatory movements of double electric layers and fluctuation-charged edges of microcracks, and the migration and vibration of charged dislocations. In this case, the EMS parameters will depend on the amplitude-frequency spectrum of the acoustic field.…”

“…EMS excitation caused by acoustic-electrical transformations is used as a physical model for this non-destructive testing technique. Experimental laboratory studies showed [17,19,[23][24][25][26] that these transformations are one of the main techniques to excite EMS in heterogeneous dielectric materials. The obtained parameters of electromagnetic responses to external deterministic acoustic excitation can be used to efficiently control dielectric products containing magnetic or magnetizable defects.…”

Polarization and Electromagnetic Emissions of Natural Crystalline Structures upon Acoustic Excitation

“…Methods based on mechanoelectric transformations in concrete can be used for such control. For this purpose, acoustic sounding and reception of information about the formation of destruction zones in the radio frequency band in the form of electromagnetic signals (EMS) [1][2][3] can be used. Another method can be based on loading control samples of concrete in a varying force field and recording electromagnetic emissions (EME) at different stages of degradation development in the same frequency range [4,5].…”