Relaxation of particle-laden interfaces: geometric and preparation effects
arxiv(2024)
摘要
The relaxation of uni-axially compressed particle rafts through a finite
opening found at the opposite side is experimentally studied. Three main
behaviours are identified. The lowest relaxation degree corresponds to local
unjamming. The other extreme corresponds to full relaxation and is
characterized by the unjamming of the entire raft. In between, intermediate
relaxation is observed. The unjammed domain first grows along the compression
direction with an almost constant width and possibly extends through the entire
raft length. In this case, a second phase may start during which erosion
enables the unjammed channel to develop normally to the compression direction.
Employing different raft geometries, i.e. various length and compression
levels, and openings of various widths, we rationalize the occurrence of these
different behaviours, which we attribute to the mechanical robustness of the
force chain network. The threshold for channel formation and erosion are
interpreted as its rupture against excessive shear and elongation,
respectively. By further comparing results obtained for rafts prepared
according to three different mixing degrees, we evidence that these thresholds
are strongly affected by the raft history and quantify these effects in terms
of shift of the rupture limits.
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