On the structure of acoustic emission of model samples in response to an external energy action

Abstract

Experiments with a press are carried out in the regime of discrete changes in the axial load level. It is established that the energy spent on the generation of a unit acoustic pulse e1 increases by three orders of magnitude as the load increases to the sample failure value. The temporal variation patterns of the acoustic emission due to an electric action and discrete loading are shown to be identical. The structure of the initiated acoustic response is found to be very sensitive to changes in parameters of the energy applied. The measured coefficient of acoustoelectric coupling is K me = 2.85 × 10−2. An algorithm is proposed for the specification of an energy saturation level in model samples that is close to the in situ level. The results of this work create prerequisites for studying seismic-acoustoelectric couplings and developing schemes for controlling such processes, in particular, changes in the regime of seismicity and the release of elastic energy accumulated in the medium.