Statistical Regularities of Formation of a Main Crack in a Structurally Inhomogeneous Material under Various Deformation Conditions
| Autor: | Vladimir Hilarov, D. I. Frolov, Ivan Panteleev, Dina Gafurova, Ekaterina Damaskinskaya |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Deformation (mechanics) 020206 networking & telecommunications 02 engineering and technology Multifractal system Mechanics 010502 geochemistry & geophysics Condensed Matter Physics 01 natural sciences Signal Electronic Optical and Magnetic Materials Exponential function Moment (mathematics) Acoustic emission 0202 electrical engineering electronic engineering information engineering Fracture (geology) Quasistatic process 0105 earth and related environmental sciences |
| Zdroj: | Physics of the Solid State. 60:1821-1826 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/s106378341809007x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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