Orateur
Description
We emply particle dynamics simulations to investigate the impact of particle
fragmentation on granular column collapse. Each particle is a polyhedron tessellated into polyhedral cells and
particle fracture is based on Grifith criterion applied to the interfaces between the cells
Depending on the value of fracture energy, the particles may undergo different levels of fragmentation.
We show that the spationtemporal behavior of breakage events is complex.
The value of the fracture energy affects the slip surface, intergranular contacts, and frictional behavior.
Fragmentation induces fragment dispersion differentiating runout front and a saltating front whose
spatial distribution depends on the breakage rate. Three-dimensional simulations indicate that the
overall runout length is largely insensitive to fracture energy, provided it is sufficiently low
to cause fragmentation, though fragment redistribution is markedly affected.
Fragmentation affects the maximum normalized deposit height primarily
dictated by the initial geometry. Particle breakage reshapes the deposit slope through
size-dependent fragment redistribution, fostering intricate internal granular fabrics
and surface topographies.