Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session A62: Undergrad Research II
8:00 AM–11:00 AM,
Monday, March 4, 2024
Room: 208CD
Sponsoring
Unit:
APS/SPS
Chair: Earl Blodgett, Society of Physics Students
Abstract: A62.00008 : Simulations of jammed, quasi-statically sheared particles and fixed pins*
9:24 AM–9:36 AM
Presenter:
Jean Luc Ishimwe
(Swarthmore College)
Authors:
Jean Luc Ishimwe
(Swarthmore College)
Xiang Li
(Swarthmore College)
AKM Sadman Mahmud
(Bucknell University)
Amin Danesh
(Bucknell University)
Michael J Bolish
(Bucknell University)
Cacey S Bester
(Swarthmore College)
Brian Utter
(University of California, Merced)
Katharina Vollmayr-Lee
(Bucknell University)
Amy L Graves
(Swarthmore College)
We determine properties of a two-dimensional, soft, granular system at different pin densities via molecular dynamics simulations with rough walls to establish constant pressure and shear rate. Macroscopically, we find that the presence of pins decreases the linear elasticity and increases the plasticity of the system. Mesoscopically, transverse velocity is attenuated and circulation patterns are established around pins. Collective behaviors for shearing and compression are approximated by models with Hookian springs. On the microscopic level, non-affine deformations of clusters of particles, quantified using D2min, are more pronounced around pins and the total number of locations of high D2min increase with pin density.
[1] P. Wentworth-Nice et al., Soft Matter 16, 5305 (2020); A.L. Zhang et al, Phys. Rev. E 106, 034902 (2022).
*We acknowledge the financial support from the National Science Foundation DMR-1905474 and DMR-1905737 and XSEDE/ACCESS allocations DMR-190064/PHY230003 and TRA100004.
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