PSI - Issue 47

Oleg Naimark et al. / Procedia Structural Integrity 47 (2023) 782–788 / Structural Integrity Procedia 00 (2019) 000–000

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established by Naimark, Uvarov, Bannikov, Bayandin and Nikityuk (2022) and determines the transitions between characteristic damage-failure staging, Fig.4.

Figure 4. Results of RQA analysis of acoustic signals in term of laminarity parameter versus time. The plateau demonstrates the existence of critical points separating the damage-failure staging.

3. Conclusion Acoustic emission using the piezoelectric sensors (PES) and fiber-optic (FOS) sensors was detected for the staging of damage-failure transition. The analysis of the time delay sequences and the energy of acoustic events revealed the power laws that is characteristic of the Self-Organized Criticality (SOC). The processing of acoustic data from piezo- and optic channels by the RQA method showed the presence of two critical points, which determine the transitions between the characteristic stages of damage-failure transition. Similar signs were established in damage failure transition analysis as specific type of critical phenomena (structural-scaling transition in defects ensemble) when the damage-failure staging was the consequence of the self-tuning of the system with defects. The presence of two critical points in term of the laminarity parameter estimated by RQA method is associated with the point of transition to orientationally pronounced collective damage modes and damage localization modes as the precursor of macroscopic crack origin. Acknowledgements Research was supported by the Russian Science Foundation (project 21-79-30041), https://rscf.ru/en/project/21 79-30041/ References Back, P., Tang, C., Wiesenfeld, K. 1987, Self-organized criticality: An explanation of 1/f noise. Physical Review Letters, 59, 4, 381-384. Chen, Z., Ansari, F. Fiber, 2000. Fiber optic acoustic distribution crack sensor for large structures, Journal of Structural Control, 7, 1, 119-120. Marwan, N. 2008. A historical review of recurrence plots. Eur. Phys. J. Spec. Topics 164, 1, 3–12. Marwan, N. and Webber, C.L. Recurrence quantification analysis: Theory and best practices, Springer, 2015. Naimark, O.B. Defect Induced Transitions as Mechanisms of Plasticity and Failure, In Multifield Continua, Advances in Multifield Theories of Continua with Substructure, Capriz, G. and Mariano, P., (Eds.), Birkhäuser, Boston, 2004, 75–114; Naimark, O.B. 2016. Energy Release Rate and Criticality of Multiscale Defects Kinetics. Int. J. Fracture, 202, 271– 279;