Force fluctuations in sheared granular disks

doi:10.1007/s11709-013-0189-7

Front Struc Civil Eng

2013, Vol. 7

Issue (1) : 46-49 https://doi.org/10.1007/s11709-013-0189-7

RESEARCH ARTICLE

Force fluctuations in sheared granular disks

Mingbo YUAN¹, Qicheng SUN²(

), Feng JIN²

1. Shandong College of Electronic Technology, Jinan 250014, China; 2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

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Abstract

The internal structure established within granular materials, often observed as force chains, is dominant in controlling bulk mechanical properties. We designed a two-dimensional Hele-Shaw cell to contain photoelastic disks, and two servos were used on the top and right boundaries individually. We experimentally monitored the fluctuations in force on the top plate while slowing the shearing of the well-confined disks and keeping the right boundary at a contact-confined force of 0.2 kN. The particle rearrangements were found to correspond to bulk force drops and were observed in a localized zone with a length of approximately 5 particle diameters. These results help reveal the structure and mechanics of granular materials, and further investigations are ongoing.

Keywords granular matter force chain stick and slip

Corresponding Author(s): SUN Qicheng,Email:qcsun@tsinghua.edu.cn

Issue Date: 05 March 2013

Cite this article:

Mingbo YUAN,Qicheng SUN,Feng JIN. Force fluctuations in sheared granular disks[J]. Front Struc Civil Eng, 2013, 7(1): 46-49.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0189-7
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I1/46

Fig.1 Schematics of the experimental setup. The left boundary and lower boundary are fixed. (a) The motion of both the right and upper boundaries is controlled by servo motors. The forces and displacements of both boundaries are monitored. In this work, a constant vertical loading speed of 1.0 mm/min was imposed on the upper boundary. The confining force of 0.2 kN was maintained on the right boundary; (b) An illustrative example of a monolayer of bidisperse disks between two glass plates is shown.

Fig.2 Time series of the driving plate force at constant vertical compressing speed 1.0 mm/min. Rapid force drops indicate that internal structure adjustments occurred (see the red curve). The horizontal confining force as kept at a constant of 0.2 kN, indicated by the blue line.

Fig.3 Particle rearrangements in a local zone. The time interval is 4 s. Evident structural changes occur between the states and , as shown in Fig. 1. The typical length of a zone of particles adjusting positions is approximately 5 particle diameters. (a) Before ; (b) ->; (c) after

Fig.4 The standard deviation of particles displacement vs. force fluctuations. Larger values of correspond to larger force drops.

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