Irreversible transition of amorphous and polycrystalline colloidal solids under cyclic deformation

作     者：Pritam Kumar Jana Mikko J. Alava Stefano Zapperi 

作者机构：COMP Centre of Excellence Department of Applied Physics Aalto University P.O. Box 11100 FI-00076 Aalto Espoo Finland Université Libre de Bruxelles (ULB) Interdisciplinary Center for Nonlinear Phenomena and Complex Systems Campus Plaine CP 231 Blvd. du Triomphe B-1050 Brussels Belgium Center for Complexity and Biosystems Department of Physics University of Milano via Celoria 16 20133 Milano Italy CNR-ICMATE Via R. Cozzi 53 20125 Milano Italy 

出 版 物：《Physical Review E》 (物理学评论E辑：统计、非线性和软体物理学)

年 卷 期：2018年第98卷第6期

页      面：062607-062607页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：Aalto University School of Science Science-IT Seventh Framework Programme, FP7 Fonds De La Recherche Scientifique - FNRS, FNRS European Research Council, ERC European Commission, EC, (291002) Academy of Finland, (251748) Academy of Finland FiDiPro program, (13282993) 

主　　题：Phase transitions Plastic deformation Polycrystals Colloidal glass Colloids Molecular dynamics 

摘      要：Cyclic loading on granular packings and amorphous media leads to a transition from reversible elastic behavior to an irreversible plasticity. In the present study, we investigate the effect of oscillatory shear on polycrystalline and amorphous colloidal solids by performing molecular dynamics simulations. Our results show that close to the transition, both systems exhibit enhanced particle mobility, hysteresis, and rheological loss of rigidity. However, the rheological response shows a sharper transition in the case of the polycrystalline sample as compared to the amorphous solid. In the polycrystalline system, we see the disappearance of disclinations, which leads to the formation of a monocrystalline system, whereas the amorphous system hardly shows any ordering. After the threshold strain amplitude, as we increase the strain amplitude both systems get fluid. In addition to that, particle displacements are more homogeneous in the case of polycrystalline systems as compared to the amorphous solid, mainly when the strain amplitude is larger than the threshold value. We do not see any effect of oscillation frequency on the reversible-irreversible transition.