X-ray tomography investigation of cyclically sheared granular materials
Yi Xing, Jie Zheng, Jindong Li, Yixin Cao, Wei Pan, Jie Zhang and, Yujie Wang
TL;DR
This study uses X-ray tomography and shear force measurements to analyze the microscopic and macroscopic behaviors of cyclically sheared granular materials, revealing how particle interactions influence overall system response.
Contribution
It provides new insights into the microscopic mechanisms driving macroscopic shear behavior and introduces an empirical relationship linking contact friction to shear force.
Findings
Contact friction induces large structural fluctuations.
Frictional contacts cause significant shear dilatancy.
An empirical constitutive model for shear force is proposed.
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 the macroscopic shear force during the shear cycle. We explain the macroscopic behaviors of the system based on microscopic processes, including the 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.
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