Authors: T.M. Chernikova, V.V. Ivanov, E.A. Mikhaylova

Title of the article: Study of statistics of the stream of pulses electromagnetic emission at destruction composite materials

Year: 2015, Issue: 3, Pages: 77-82

Branch of knowledge: Dynamics and strength

Index UDK: 678.017: 620.17

DOI: -

Abstract: The urgency of the discussed issue. Successful advance in a solution of the problem of durability requires carrying out pilot studies of physical regularities of destruction of concrete composite materials and construction on this basis of clear physical ideas of process of destruction of a composite and optimum methods of research of destruction. The main aim of this paper experimental determination of nature of casual process of formation of cracks on the basis of research of statistics of rated scope of Hurst for electromagnetic impulses of the loaded samples of composite materials. As the impulses of electromagnetic issue generated by process of formation of microcracks are the casual process possessing the same statistical properties, as process of formation of cracks.The methods used in the study. Studies of electromagnetic emission during loading phenoplasts T214, T266 and textolites PTM, PTN were carried out on the installation allowing to register parameters and quantity of impulses of electromagnetic emissions. In the process of loading exponential law of Hurst for statistics of rated scope of the accumulative averages was investigated. For Markov casual processes Hurst exponent is close to independent increments to 0,5. In case the loaded sample behaves as system with memory, this indicator more than 0,5. The results. For samples of different composition, manufacturing technology, heat-treated and no, two-phasic nature of process of formation of cracks is observed. As values of Hurst exponent H> 0.5, process of formation of cracks at the last stage is the persistentny casual process, more difficult, than Poisson. It is characterized by the Hurst exponent H who is in the range from 0,55 to 1,5. Hurst exponent H for statistics of rated deviations of the accumulation averages when studying temporary streams of structural damages to composite materials can serve as an indicator of the material transition to a critical stage of destruction.

Key words: composite materials destruction electromagnetic emission pulses Hurst exponent

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