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If we fill a container with grains and tap it, the material compacts. It we tap the container many times, the density of the granular sample will reach a limiting value. However, this limiting density depends on the intensity of the taps. For over a decade, it has been clear that increasing tap intensity leads to a decrease of the final density. However, all these studies were done with light taps. By using simulations, we have shown that increasing tap intensity to very high values will lead to a new compaction of the granular sample. Experimental proof of this prediction has been achieved in cooperation with the granular research group of the University of Navarra by using glass beads


  1. Papers in Physics 3, 030004 (2011): L. A. Pugnlaoni, J. Damas, I. Zuriguel, D. Maza, Master curves for the stress tensor invariants in stationary states of static granular beds. Implications for the thermodynamic phase space
  2. Journal of Statistical Mechanics: Theory and Experiment P01007 (2011): C.M. Carlevaro, L.A. Pugnaloni, Steady state of tapped granular polygons
  3. Physical Review E (Rapid Communications) 82, 050301_1-050301_4 (2010): L.A. Pugnaloni, I. Sánchez, P.A. Gago, J. Damas, I. Zuriguel, D. Maza, Towards a relevant set of state variables to describe static granular packings
  4. Granular Matter 11, 371-378 (2009): R.O. Uñac, A.M. Vidales, L.A. Pugnaloni, Simple model for wet granular beds subjected to tapping
  5. Granular Matter 11, 365-369 (2009): P.A. Gago, N.E. Bueno, L.A. Pugnaloni, High intensity tapping regime in a frustrated lattice gas model of granular compaction
  6. Granular Matter 11, 53-61 (2009): A.M. Vidales, L.A. Pugnaloni, I. Ippolito, Compaction and arching in tapped pentagon deposits
  7. Physical Review E 78, 051305_1-051305_7 (2008): L.A. Pugnaloni, M. Mizrahi, C.M. Carlevaro, F. Vericat, Nonmonotonic reversible branch in four model granular beds subjected to vertical vibration
  8. Physical Review E 77, 051305_1-051305_6 (2008): A.M. Vidales, L. A. Pugnaloni, I. Ippolito, Pentagon deposits unpack under gentle tapping