Abstract
Particle shape affects both the quasi-static and dynamic behaviour of granular media. There has been significant research devoted to the flowability of systems of irregularly shaped particles, as well as the flow of grains around fixed intruders, however the behaviour of free flowing intruders within granular flows remains comparatively unexplored. Here, the effect of the shape of these intruder particles is studied, looking at the kinematic behaviour of the intruders and in particular their tendency of orientation. Experiments are carried out within the Stadium Shear Device, which is a novel apparatus able to continuously apply simple shear conditions to two-dimensional grain analogues. It is found that the intruder shows different behaviour to that of the bulk flow, and that this behaviour is strongly shape dependent. These insights could lead to the development of admixtures that alter the flowability of granular materials.
Highlights
Granular materials exhibit complex behaviour that is not found in other solids or liquids
There exist no adequate models to explain these additional factors which are introduced into the rheology of granular materials by anisotropic shaped particles – even for relatively simple shapes such as ellipsoids or rods [5]
Preliminary results have been presented which show the behaviour of the intruder particles
Summary
Granular materials exhibit complex behaviour that is not found in other solids or liquids. The properties of the granular mass, whether it be static strength or their subsequent flowing behaviour, are dependent on many factors, including: particle surface roughness, static electricity and cohesive forces, as well as particle size, density, stiffness and shape. The majority of granular materials which are produced, collected or conveyed are of an irregular shape Many tests, both experimental and computational, have used spheres or cylinders due to the simplicity of those shapes [1] with glass beads often chosen for fundamental experiments. There exist no adequate models to explain these additional factors which are introduced into the rheology of granular materials by anisotropic shaped particles – even for relatively simple shapes such as ellipsoids or rods [5]
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