Granular Matter
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Random generation of 2D geometry-controlled particles via the epicycle series
Granular Matter - Tập 22 - Trang 1-17 - 2020
The discrete element method (DEM) represents a classical and popular research approach to exploring the particle shape effects of granular materials. For many modellers, the acquisition of irregular particle outlines is a problem of considerable practical importance. To mitigate this problem, a novel method based on epicycle series is introduced in this study, and it can produce geometry-controlle......
Rolling resistance of a spherical pod on a granular bed
Granular Matter - Tập 19 - Trang 1-10 - 2017
The motion of a spherical ball rolling without slipping or plowing on a granular bed is studied. We propose a definition of the rolling resistance force and torque, and carry out experiments with a basketball and medicine ball rolling on a bed of gravel to measure the corresponding rolling resistance coefficients. These experiments reveal, in good agreement with literature, coefficients that are v......
Particulate modeling of cementation effects on small and large strain behaviors in granular material
Granular Matter - Tập 19 Số 1 - 2017
Effects of grain morphology on suffusion susceptibility of cohesionless soils
Granular Matter - Tập 23 Số 1 - 2021
Stiffness evolution of granular layers and the origin of repetitive, slow, stick-slip frictional sliding
Granular Matter - Tập 17 - Trang 447-457 - 2015
We demonstrate the frictional behaviors of steady state sliding, stick-slip, and repetitive, slow stick-slip sliding through a carefully-designed suite of laboratory experiments focused on exploring the role of loading system stiffness in controlling the frictional response to shear. We performed tests on sheared layers of baking flour, with three configurations of loading blocks made of steel and......
High intensity tapping regime in a frustrated lattice gas model of granular compaction
Granular Matter - Tập 11 - Trang 365-369 - 2009
In the frame of a well established lattice gas model for granular compaction, we investigate the high intensity tapping regime where a pile expands significantly during external excitation. We find that this model shows the same general trends as more sophisticated models based on molecular dynamic type simulations. In particular, a minimum in packing fraction as a function of tapping strength is ......
The role of interstitial gas in the Brazil Nut effect
Granular Matter - Tập 5 - Trang 107-114 - 2003
We have studied the Brazil Nut effect – the rise of a large intruder particle within a vertically vibrated bed of smaller particles. In our study both intruder and bed particles were spherical and the vibration was such that bed convection was negligible. The rise of the intruder was found to be influenced by humidity of the air within the interstices of the particle bed and on the electrostatic c......
Statistical analysis of contact force components in random granular assemblies
Granular Matter - Tập 5 - Trang 45-54 - 2003
This paper analyses the probability density functions of contact force components corresponding to the principle directions of average stress. A theoretical prediction is derived for the distribution of these components, with the help of maximizing the statistical entropy. Limits of validity of the prediction are analyzed by numerical simulations on isotropic assemblies under hydrostatic pressure......
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