Sun, 27 Jul 2008 08:02:42 BST CiteULike: dchen's Rotter http://www.citeulike.org/user/dchen/author/Rotter CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2563129 <i>Physical Review Letters, Vol. 98, No. 2. (2007)</i><br /><br />The results of an experimental investigation into the effects of particle shape on the stress dip formed under a 2D sandpile is reported. We find good agreement with previous results of a small dip for mixtures of disks poured from a localized source. The new finding is that the dip is significantly enhanced when elliptical particles are used. We attribute the amplification of the effect to orientational ordering induced by the shape of the grains which removes the degeneracy of circular particles. Effect of Particle Shape on the Stress Dip Under a Sandpile I Zuriguel T Mullin JM Rotter doi:10.1103/PhysRevLett.98.028001 Physical Review Letters, Vol. 98, No. 2. (2007) 2008-03-19T17:13:57-00:00 2007 Physical Review Letters 98 2 APS 2007 experiment force grains