Spatial clustering of microscopic dynamics governs the slip avalanche of sheared granular materials

Mei，Jiangzhou1,2; Ma，Gang1,2; Tang，Longwen3; Gao，Ke4; Cao，Wanda1,2; Zhou，Wei1,2

2023-04-01

10.1016/j.ijplas.2023.103570

INTERNATIONAL JOURNAL OF PLASTICITY   Impact Factor & Quartile

0749-6419

1879-2154

Establishing quantifiable links between individual-particle dynamics and macroscopic response of granular materials has been a longstanding challenge, with implications in material science, geology and industry. Despite sustained efforts in uncovering generic features in both macroscopic flow and microscopic dynamics, further advance on the subject matter demands quantitative correlations to be established. We propose a 3D convolution neural network (CNN) to quantify the link between microscopic dynamics and macroscopic stress fluctuations, including both stress recharge (stick regime) and stress drop (slip regime). Through the model interpretation, microscopic dynamics is found to demonstrate distinctive spatial patterns in the stick and slip regimes, which root in the result of free volume-induced structural rearrangements and contact network dynamics, respectively. We conclude that the spatial clustering of microscopic dynamics governs the occurrence of slip avalanches and acts as the “fingerprint” of macroscopic stress fluctuation. The data-driven framework developed in this paper can be readily extended to other amorphous solids for building cross-scale relations, paving a new way to understand the complex behavior of amorphous solids.

Granular material Microscopic dynamics Slip avalanche Stress fluctuation

SCI

English

Others

National Key R & D Program of China[2022YFC3005503] ; National Natural Science Foundation of China["51825905","U1865204"]

Engineering ; Materials Science ; Mechanics

Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics

WOS:000948809700001

PERGAMON-ELSEVIER SCIENCE LTD

ENGINEERING

2-s2.0-85148537415

Scopus

1.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,430072,China
2.Institute of Water Engineering Sciences,Wuhan University,Wuhan,430072,China
3.Department of Civil and Environmental Engineering,University of California,Los Angeles,90095,United States
4.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Mei，Jiangzhou,Ma，Gang,Tang，Longwen,et al. Spatial clustering of microscopic dynamics governs the slip avalanche of sheared granular materials[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2023,163.

Mei，Jiangzhou,Ma，Gang,Tang，Longwen,Gao，Ke,Cao，Wanda,&Zhou，Wei.(2023).Spatial clustering of microscopic dynamics governs the slip avalanche of sheared granular materials.INTERNATIONAL JOURNAL OF PLASTICITY,163.

Mei，Jiangzhou,et al."Spatial clustering of microscopic dynamics governs the slip avalanche of sheared granular materials".INTERNATIONAL JOURNAL OF PLASTICITY 163(2023).