Jamming of non-circular and deformable particles

报告时间：2018年5月11日上午11:00

报告地点：新主楼A849

报告人：Mark D. Shuttack 副教授（纽约城市大学）

报告摘要：

We study mechanically stable packings of deformable and rigid 2D circulo-polygons using computer simulations. A 2D circulo-polygon is a particle shape formed by the collection of all points equidistant from the edge of a polygon. It is a generalization of the 2D circulo-cylinder and a circle, which are the collections of all points equidistance from a line and a point, respectively. In our model, the circulo-polygon can be deformable, where the only constraint on the particle is that shape factor, the ratio of the area of the polygon to the square of the perimeter, is fixed. We present the densities and average contact numbers for collections of jammed mono- and bi-disperse packings of circulo-polygons for a range of shape factors, edge numbers, and system sizes. For rigid particles, we find mechically stable packings with fewer than isostatic contacts.  For deformable polygons, we identify a new phase transition between non-confluent and confluent systems that occurs when the particle shape factor is comparable to the average shape factor for Voronoi polygons of disk packings.

报告人介绍：

Associate Professor Mark D. Shattuck received his bachelor's degree in Physics from Wake Forest University, and his Ph.D. in Physics from Duke University in 1995 for experimental studies of porous media flows using MRI visualization. He held postdoctoral fellowships in medical physics at Duke University and in granular physics at the University of Texas at Austin. In 2000, he joined the faculty of The City College of New York in the Benjamin Levich Institute with a joint appointment in the Department of Physics, where he performs experimental and computational research in soft condensed matter, glasses, and granular materials. He has developed a number of novel particle imaging, tracking, and production techniques, and developed analogies between granular media and systems in thermal equilibrium, which elucidate the mechanical and statistical properties of granular systems.  He was named a Fellow of the American Physical Society in 2012.