Abstract
Columns made of convex noncohesive grains like sand collapse after being released from a confining container. However, structures built from non-convex grains can be stable without external support. In the current experiments, we investigate the effect of vibration on destroying such columns. The change of column height during vertical vibration, can be well characterized by stretched exponential relaxation when the column is short, which is in agreement with previous work, while a faster collapse happens when the column is tall. We investigate the collapse after the fast process including its dependence on column geometry, and on interparticle and basal friction.
Highlights
Jamming of granular matter is a wide-spread phenomenon [1, 2]
In the following we refer to the acrylic particles as low friction (LF) particles, and the nylon high friction (HF)
We refer to the Teflon and sand paper as low friction (LF) and high friction (HF) bases
Summary
Jamming of granular matter is a wide-spread phenomenon [1, 2]. One can see piles of sand and rocks, packing of apples and oranges in grocery stores. If one prepares a packing of the particles in a vertical tube and removes the tube confinement, the cylindrical packing can retain its shape without confinement, and possibly sustain compression and shear [10] This new phenomenon is interesting from the packing and jamming theory point of view [12,13,14,15], and has significant implications, such as material and architectural design [16,17,18]. The work by Gravish et al [8] on staple packings is relevant here Their experiment involves collapse of a column under external vibration. It is interesting to ask whether the packing of other extreme shaped particles has a similar response to vibration
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