Solitonic State in Microscopic Dynamic Failures
| Autor: | Hamed O. Ghaffari, W. A. Griffith, Matej Pec |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Field (physics) Characteristic length Phase (waves) Nucleation lcsh:Medicine FOS: Physical sciences Pattern Formation and Solitons (nlin.PS) Applied Physics (physics.app-ph) Article Displacement (vector) Length contraction Physics - Geophysics 03 medical and health sciences Acceleration 0302 clinical medicine lcsh:Science Physics Condensed Matter - Materials Science Multidisciplinary lcsh:R Materials Science (cond-mat.mtrl-sci) Physics - Applied Physics Mechanics Nonlinear Sciences - Pattern Formation and Solitons Geophysics (physics.geo-ph) 030104 developmental biology lcsh:Q Deformation (engineering) 030217 neurology & neurosurgery |
| Zdroj: | Scientific Reports, Vol 9, Iss 1, Pp 1-9 (2019) Scientific Reports |
| DOI: | 10.48550/arxiv.1806.04133 |
| Popis: | Onset of permanent deformation in crystalline materials under a sharp indenter tip is accompanied by nucleation and propagation of defects. By measuring the spatio-temporal strain field near the indenter tip during indentation tests, we demonstrate that the dynamic strain history at the moment of a displacement burst carries characteristics of the formation and interaction of local excitations, or solitons. We show that dynamic propagation of multiple solitons is followed by a short time interval where the propagating fronts can accelerate suddenly. As a result of such abrupt local accelerations, duration of the fast-slip phase of a failure event is shortened. Our results show that formation and annihilation of solitons mediate the microscopic fast weakening phase, during which extreme acceleration and collision of solitons lead to non-Newtonian behavior and Lorentz contraction, i.e., shortening of solitons’ characteristic length. The results open new horizons for understanding dynamic material response during failure and, more generally, complexity of earthquake sources. |
| Databáze: | OpenAIRE |
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