Dynamic Destruction as Analogs of Critical Phenomena in Metal Samples with Various Geometries within a Wide Ranges of Amplitude–Time Characteristics of External Action

• Published in: Physics of atomic nuclei Vol. 83; no. 11; pp. 1585 - 1596
• Main Authors: Kosheleva, E. V., Sel’chenkova, N. I., Sokolov, S. S., Trunin, I. R., Uchaev, A. Ya
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2020; Springer; Springer Nature B.V
• Subjects: Clusters; Critical phenomena; Fractal geometry; Fractals; Fracture surfaces; Invariance; Particle and Nuclear Physics; Percolation; Physics; Physics and Astronomy; Scale invariance; Self-similarity; Shock waves; Solids under Extreme Conditions; energy cumulation; dynamic fracture; dispersion process; dissipative structures; fractal dimension; high-intensity loading; similarity of processes; Hurst exponent; feedbacks; multiwave processes
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/S1063778820090148

The quantitative characteristics of the products of dispersion and the cascade of dissipative structures arising in metals under shock-wave loading are determined. The fractal dimension d f and the Hurst exponent H (standardized range of dissipative structures) of the cascade of hydrodynamic modes, the roughness of the fracture surface, and the dispersion products are determined. Destructive processes occurring in loaded samples are numerically simulated using the Lagrangian technique TIM 3D [1, 2]. It is shown that a cascade of dissipative structures at different scale–temporal levels (nanolevel, mesolevel I, mesolevel II, and macrolevel) is a fractal cluster, and it is a percolation cluster on the threshold of a macrofracture, when there is connectivity in the system of dissipative structures [1, 2]. The self-similarity of dissipative structures is due to the self-organization in nonequilibrium systems; and the dynamic fracture and dispersion processes are examples of scale invariance. The scale invariance of the dissipative structures indicates the nonequilibrium system has reached a critical state.