O'Hern CS, Langer SA, Liu AJ, Nagel SR
Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, California 90095-1569 and James Franck Institute, The University of Chicago, Chicago, Illinois 60637.
Phys Rev Lett. 2001 Jan 1;86(1):111-114. doi: 10.1103/PhysRevLett.86.111.
We calculate the distribution of interparticle normal forces P(F) near the glass and jamming transitions in model supercooled liquids and foams, respectively. P(F) develops a peak that appears near the glass or jamming transitions, whose height increases with decreasing temperature, decreasing shear stress and increasing packing density. A similar shape of P(F) was observed in experiments on static granular packings. We propose that the appearance of this peak signals the development of a yield stress. The sensitivity of the peak to temperature, shear stress, and density lends credence to the recently proposed generalized jamming phase diagram.
我们分别计算了模型过冷液体和泡沫中靠近玻璃化转变和堵塞转变处的粒子间法向力P(F)的分布。P(F)会形成一个在玻璃化或堵塞转变附近出现的峰值，其高度随着温度降低、剪切应力减小和堆积密度增加而增大。在静态颗粒堆积实验中观察到了P(F)的类似形状。我们提出，这个峰值的出现标志着屈服应力的产生。该峰值对温度、剪切应力和密度的敏感性为最近提出的广义堵塞相图提供了可信度。
