Details

Autor(en) / Beteiligte

• Albert, I
• Tegzes, P
• Albert, R
• Sample, J G
• Barabási, A
• Vicsek, T
• Kahng, B
• Schiffer, P

Titel

Stick-slip fluctuations in granular drag

Ist Teil von

• Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 2001-09, Vol.64 (3 Pt 1), p.031307-031307, Article 031307

Ort / Verlag

United States

Erscheinungsjahr

2001

Quelle

American Physical Society [PROLA]

Beschreibungen/Notizen

• We study fluctuations in the drag force experienced by an object moving through a granular medium. The successive formation and collapse of jammed states give a stick-slip nature to the fluctuations which are periodic at small depths but become "stepped" at large depths, a transition that we interpret as a consequence of the long-range nature of the force chains and the finite size of our experiment. Another important finding is that the mean force and the fluctuations appear to be independent of the properties of the contact surface between the grains and the dragged object. These results imply that the drag force originates in the bulk properties of the granular sample.