Interference protection in geoacoustic control of critical stresses in rocks

Nikolenko, P. V.; Набатов, В. В.

doi:10.17580/gzh.2015.09.06

Cited by 4 publications

(1 citation statement)

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“…e use of composites placed in measuring boreholes significantly reduced the spread of stress estimates in the massif by eliminating the uncertainty factor caused by the random distribution of properties in the "memory carrier." An additional advantage of using materials with programmable properties is the possibility of using specific techniques and algorithms for processing the results of measurements [14]. At the forefront in this case comes the spectral analysis of AE signals, which makes it possible to obtain additional information on the defects growth in the investigated medium.…”

Section: Introductionmentioning

confidence: 99%

Spectral Characteristics of Acoustic Emission in Carbon Fiber‐Reinforced Composite Materials Subjected to Cyclic Loading

Шкуратник

Nikolenko

2018

Advances in Materials Science and Engineering

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The article is devoted to the investigation of the spectral characteristics of acoustic emission signals that appear under various schemes of composite materials loading. The tests involved samples of composites reinforced with layers sheets of carbon fiber fabric and dispersed carbon fibers. Based on the results of laboratory tests, a comparison is made between the traditional parameters of acoustic emission and the complete spectrograms of the acoustic emission response developed with the use of a special algorithm. The relationship between the emission activity and the change in the spectral composition of emission hits is shown. For example, for some composites, the acoustic emission memory effect (Kaiser effect) manifests itself not only in the time domain but also in the spectral domain in a form of a sharp change in the amplitudes in the frequency range 130/150 kHz. Also, when the samples were loaded according to the Brazilian scheme, the presence of the so-called “inverse” Kaiser effect is observed, in which the memory carrier “remembers” the previously experienced level of tensile stresses and reproduces this information during subsequent unloading. Such effect manifests itself in the form of a sharp change in the amplitudes in the low-frequency region of the spectrum.

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Section: Introductionmentioning

confidence: 99%