X-Ray Tomography Investigation of Cyclically Sheared Granular Materials
- 27 January 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 126 (4), 048002
- https://doi.org/10.1103/physrevlett.126.048002
Abstract
We perform combined x-ray tomography and shear force measurements on a cyclically sheared granular system with highly transient behaviors, and obtain the evolution of microscopic structures and macroscopic shear force during the shear cycle. We explain the macroscopic behaviors of the system based on microscopic processes, including particle level structural rearrangement and frictional contact variation. Specifically, we show how contact friction can induce large structural fluctuations and cause significant shear dilatancy effect for granular materials, and we also construct an empirical constitutive relationship for the macroscopic shear force.Keywords
Funding Information
- National Natural Science Foundation of China (11974240, 11675110, U1738120)
- Science and Technology Commission of Shanghai Municipality (19XD1402100)
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