Acoustic emission in case of impact damage to cement stone, statically compressed orthogonally to the impact
Kadomtsev A. G. 1, Shcherbakov I.. P. 1, Chmel A. E.1
1Ioffe Institute, St. Petersburg, Russia
Email: chmel@mail.ioffe.ru
Uniaxially compressed cement stone samples M-400 were subjected to point impact damage during orthogonally directed compression. The impact-induced acoustic emission generation was recorded in the range of 400-600 kHz. The threshold of impact fracture (fragmentation of the sample) without applying a compressive load was preliminarily determined. It was found that the energy distributions in the time sweeps of acoustic emission without compression of the sample followed a power law characteristic of the process of cooperative microcrack formation. The energy distributions in acoustic emission pulses under constant compressive load showed an exponential function typical of random, non-interacting sources of acoustic emission that occur with an increase of the density of cement stone. When compression was close to the ultimate tensile strength of the material, the impact caused a "pre-threshold" macroscopic destruction of the samples (trigger effect). Keywords: cement stone, static load, impact fracture, trigger effect, acoustic emission.
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