Dynamic microplasticity manifestation in consolidated sandstone in the acoustical frequency range |
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| Authors: | EI Mashinskii |
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| Affiliation: | Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the RAS, Novosibirsk, Russia |
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| Abstract: | Microplasticity manifestations caused by acoustic wave in the frequency range of about 4.5 kHz–7.0 kHz are detected in consolidated artificial sandstone. Equipment was tested by means of comparison of data obtained for a standard material (aluminium) and sandstone. Microplasticity manifestations in acoustic records are present in the form of ladder‐like changes in the amplitude course. The stress plateaus in the acoustic trace interrupt the amplitude course, transform the wavefront, and shift the arrival time along the time axis. Microplasticity contribution to the acoustic record changes with the increase in the strain amplitude value. The combined elastic–microplastic process conditions the wavefront steepness and its duration. Stress plateaus exert influence on the waveform and, accordingly, on pulse frequency response. These results confirm the earlier data obtained for weakly consolidated rock. This contribution to wave propagation physics can be useful in solving applied problems in material science, seismic prospecting, diagnostics, etc. |
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| Keywords: | Inelasticity Rock microplasticity Deformation and time delay Inelastic seismic parameters Amplitude dependence of wave velocity and attenuation Relaxation spectra of wave attenuation Intermittent deformation Stress plateau Stress– strain curve Nanoindentation |
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