Granular dampers: does particle shape matter?

Does appearance matter? Impact of particle shape on nanosilver characteristics

Particle dynamics in sheared granular matter

The particle dynamics and shear forces of granular matter in a Couette geometry are determined experimentally. The normalized tangential velocity V(y) declines strongly with distance y from the moving wall, independent of the shear rate and of the shear dynamics. Local rms velocity fluctuations deltaV(y) scale with the local velocity gradient to the power 0.4+/-0.05. These results agree with a ...

Lacunar strokes: does shape matter?

Up to one in every four ischemic strokes can be lacunar infarcts. Traditionally, deep brain infarctions with a maximum diameter of 15-20 mm have been attributed to occlusion of a single penetrating artery by lipohyalinosis or microatheromatosis, but it has been suggested that other etiologies such as embolism may be responsible for up to one third of the cases. Lacunes can be detected by neuroi...

Particle shape effects on the stress response of granular packings.

We present measurements of the stress response of packings formed from a wide range of particle shapes. Besides spheres these include convex shapes such as the Platonic solids, truncated tetrahedra, and triangular bipyramids, as well as more complex, non-convex geometries such as hexapods with various arm lengths, dolos, and tetrahedral frames. All particles were 3D-printed in hard resin. Well-...

Influence of particle shape on sheared dense granular media

We study by means of molecular dynamics simulations of periodic shear cells, the influence of particle shape on the global mechanical behavior of dense granular media. Results at macro-mechanical level show that for large shear deformation samples with elongated particles, independent of their initial orientation, reach the same stationary value for both shear force and void ratio. At the micro...