Open AccessСтатистические закономерности формирования магистральной трещины в структурно-неоднородном материале при различных условиях деформирования
Author(s) -
Е.Е. Дамаскинская,
В.Л. Гиляров,
И.А. Пантелеев,
Д.Р. Гафурова,
Д.И. Фролов
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.09.46396.078
Subject(s) - acoustic emission , multifractal system , quasistatic process , materials science , exponential function , fracture (geology) , distribution (mathematics) , signal (programming language) , mineralogy , acoustics , geology , physics , composite material , fractal , mathematics , mathematical analysis , computer science , thermodynamics , programming language
The peculiarities of the formation of a main crack in the Westerly granite samples under quasistatic uniaxial compression without any lateral upthrust have been studied using the data of acoustic emission (AE) and X-ray computer microtomography (CT). The multifractal analysis of pauses between acoustic emission events and the analysis of the energy distribution functional forms of the AE signal have been performed. According to the computer tomography data, defects form only near a future main crack; i.e., no stage of disperse accumulation of defects over entire sample volume has been revealed. Two stages of the main crack formation have been observed: the first stage is characterized by an exponential energy distribution of AE signals and the second stage is characterized by a power low of the AE signal energy distribution. The multifractal analysis of the pauses between neighboring AE signals demonstrate the transition from the multifractal dynamics of the acoustic emission to the monofractal dynamics when approaching a fracture moment.