Slow dynamics in a single glass bead
| Autor: | Richard L. Weaver, John Y. Yoritomo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Imagination
Chemical substance Materials science media_common.quotation_subject Stiffness Classical Physics (physics.class-ph) FOS: Physical sciences Mechanics Physics - Classical Physics Condensed Matter - Soft Condensed Matter Microstructure 01 natural sciences 010305 fluids & plasmas Universality (dynamical systems) Geophysics (physics.geo-ph) Physics - Geophysics Nonlinear system Brittleness 0103 physical sciences medicine Soft Condensed Matter (cond-mat.soft) Ultrasonic sensor medicine.symptom 010306 general physics media_common |
| Popis: | Slow dynamic nonlinearity is ubiquitous amongst brittle materials, such as rocks and concrete, with cracked microstructures. A defining feature of the behavior is the logarithmic-in-time recovery of stiffness after a mechanical conditioning. Materials observed to exhibit slow dynamics are sufficiently different in microstructure, chemical composition, and scale (ranging from the laboratory to the seismological) to suggest some kind of universality. There lacks a consensus theoretical understanding of the universality in general and the log(time) recovery in particular. Seminal studies were focused on sandstones and other natural rocks, but in recent years other experimental venues have been introduced with which to inform theory. One such system is unconsolidated glass bead packs. However, bead packs still contain many contact points. The force distribution amongst the contacts is unknown. Here, we present slow dynamics measurements on a yet simpler system - a single glass bead confined between two large glass plates. The system is designed with a view towards rapid control of the contact zone environment. Ultrasonic waves are used as a probe of the system, and changes are assessed with coda wave interferometry. Three different methods of low-frequency conditioning are applied; all lead to slow dynamic recoveries. Results imply that force chains do not play an essential role in granular media slow dynamics, as they are absent in our system. 25 pages, 11 figures. arXiv admin note: text overlap with arXiv:1908.08935 |
| Databáze: | OpenAIRE |
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