PSI - Issue 13

Ekaterina Damaskinskaya et al. / Procedia Structural Integrity 13 (2018) 298–303 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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4. Conclusions

Our investigations have confirmed that the consideration of the defect structure evolution in the framework of the concept of self-organized criticality allows one to reveal patterns of defect accumulation corresponding to different stages of the fracture process. Different defect accumulation patterns are characterized by different functional forms of the energy distribution of AE signals. The type of the AE distribution can be used as an indicator of the current state of the deformed material and a criterion for transition to the critical stage of fracture. The exponential form of the AE signal energy distribution points to a non-critical state of the deformed material. The power-law distribution indicates the defect accumulation process has reached the critical ("dangerous") stage. This result is confirmed by X-ray tomographic data. This finding can be found useful for development of a new non destructive control method.

Acknowledgements

The authors express their gratitude to the senior researcher of the Laboratory of Volcanogenic Ore Formation of the Institute of Volcanology and Seismology Dr. M. Yu. Puzankov for conducting petrographic studies of the samples. The authors are thankful to Alexander Shuldiner and Natalie Nazina for the participation in the discussion of the experiments. This study was supported by Russian Foundation for Basic Research (Grant N 16-05-00237).

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