Geng J, Howell D, Longhi E, Behringer R P, Reydellet G, Vanel L, Clément E, Luding S
Department of Physics and Center for Nonlinear and Complex Systems, Duke University, Durham, North Carolina 27708-0305, USA.
Phys Rev Lett. 2001 Jul 16;87(3):035506. doi: 10.1103/PhysRevLett.87.035506. Epub 2001 Jul 2.
We experimentally determine ensemble-averaged responses of granular packings to point forces, and we compare these results to recent models for force propagation in a granular material. We use 2D granular arrays consisting of photoelastic particles: either disks or pentagons, thus spanning the range from ordered to disordered packings. A key finding is that spatial ordering of the particles is a key factor in the force response. Ordered packings have a propagative component that does not occur in disordered packings.
我们通过实验确定了颗粒填充物对点力的系综平均响应，并将这些结果与最近关于颗粒材料中力传播的模型进行了比较。我们使用由光弹性颗粒组成的二维颗粒阵列：圆盘或五边形，从而涵盖了从有序到无序填充物的范围。一个关键发现是颗粒的空间排序是力响应的关键因素。有序填充物具有无序填充物中不存在的传播分量。
