Zuriguel I, Mullin T, Rotter J M
Manchester Centre for Nonlinear Dynamics, University of Manchester, Oxford Road, Manchester, M139PL, United Kingdom.
Phys Rev Lett. 2007 Jan 12;98(2):028001. doi: 10.1103/PhysRevLett.98.028001. Epub 2007 Jan 11.
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.
报告了一项关于颗粒形状对二维沙堆下形成的应力凹陷影响的实验研究结果。我们发现，对于从局部源倒入的圆盘混合物形成小凹陷的先前结果，二者吻合良好。新发现是，当使用椭圆形颗粒时，凹陷会显著增强。我们将这种效应的放大归因于颗粒形状引起的取向有序化，这消除了圆形颗粒的简并性。
