Experimental evidence of ageing and slow restoration of the weak-contact configuration in tilted 3D granular packings

Details Experimental evidence of ageing and slow restoration of the weak-contact configuration in tilted 3D granular packings Experimental evidence of ageing and slow restoration of the weak-contact configuration in tilted 3D granular packings

2010-11-08

arxiv.org/abs/1011.1758v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

Granular packings slowly driven towards their instability threshold are studied using a digital imaging technique as well as a nonlinear acoustic method. The former method allows us to study grain rearrangements on the surface during the tilting and the latter enables to selectively probe the modifications of the weak-contact fraction in the material bulk. Gradual ageing of both the surface activity and the weak-contact reconfigurations is observed as a result of repeated tilt cycles up to a given angle smaller than the angle of avalanche. For an aged configuration reached after several consecutive tilt cycles, abrupt resumption of the on-surface activity and of the weak-contact rearrangements occurs when the packing is subsequently inclined beyond the previous maximal tilting angle. This behavior is compared with literature results from numerical simulations of inclined 2D packings. It is also found that the aged weak-contact configurations exhibit spontaneous restoration towards the initial state if the packing remains at rest for tens of minutes. When the packing is titled forth and back between zero and near-critical angles, instead of ageing, the weak-contact configuration exhibits "internal weak-contact avalanches" in the vicinity of both the near-critical and zero angles. By contrast, the stronger-contact skeleton remains stable.

Affiliated with

Also associated with

No associations

Rating

Experimental evidence of ageing and slow restoration of the weak-contact configuration in tilted 3D granular packings does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Experimental evidence of ageing and slow restoration of the weak-contact configuration in tilted 3D granular packings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Experimental evidence of ageing and slow restoration of the weak-contact configuration in tilted 3D granular packings will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-131009