首 页机构概况机构设置科研人才队伍合作交流研究生教育博士后图书馆创新文化党群园地院重点实验室彭桓武中心信息公开
  学术活动
  您现在的位置:首页 > 学术活动 > 专题学术报告/Seminar
(Seminar) Origin of the Jamming Scaling Exponents
2019-07-14  【 】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

Seminar

Title

题目

Origin of the Jamming Scaling Exponents 

Speaker

报告人

Corey S. O'Hern

Affiliation

所在单位

Yale University

Date

日期

July 14, 2019, 9:30am-11:30am
 

Venue

地点

ITP South (New) Building 6420 

Abstract

摘要

The response of purely repulsive disk and sphere packings to athermal, quasistatic simple shear near jamming onset is highly nonlinear. Previous studies have shown that the ensemble-averaged static shear modulus G is nearly constant at small pressure p, and at a characteristic pressure p*, G begins to increase as a power-law G p ??, where ?? = 0.5. Also, p* decreases with increasing system size, such that p* N ??, where ?? = 1. Although scaling arguments have rationalized the scaling behavior of p* and G, there is currently no quantitative theoretical framework that can predict the values of the scaling exponents ?? and ?? that control the mechanical properties near jamming onset. Here, we describe numerical simulations of bidisperse 2D disk and 3D sphere packings near jamming onset undergoing athermal, quasistatic simple shear at fixed pressure to explain these exponents. We show that ?? and ?? can be understood by examining the “geometrical families” of jammed packings, which are intervals of shear or pressure where the packings maintain the same network of interparticle contacts without rearrangements.

Contact Person

所内联系人

金瑜亮 

IE6.0浏览器,1024X768分辨率 版权所有 © 中国科学院理论物理研究所
地址:北京市海淀区中关村东路55号 邮政编码:100190
京ICP备05002865号】 京公网安备1101080094号