Micromechanical investigation of granular ratcheting using a discrete model of polygonal particles

作     者：Fernando Alonso-Marroquín Hans B. Mhlhaus Hans J. Herrmann 

作者机构：Earth Systems Science Computational Centre & School of Physical Sciences The University of Queensland Earth Systems Science Computational CentreThe University of Queensland Institut fr Baustoffe ETH-HenggerbergZrich 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2008年第6卷第6期

页      面：390-403页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：F. Alonso-Marroquin is the recipient of an Australian Research Council Postdoctoral Fellowship (project number DP0772409) 

主　　题：Granular systems Dynamics and kinematics of rigid bodies Molecular dynamics methods 

摘      要：We use a two-dimensional model of polygonal particles to investigate granular ratcheting. Ratcheting is a long-term response of granular materials under cyclic loading, where the same amount of permanent deformation is accumulated after each cycle. We report on ratcheting for low frequencies and extremely small loading amplitudes. The evolution of the sub-network of sliding contacts allows us to understand the micromechanics of ratcheting. We show that the contact network evolves almost periodically under cyclic loading as the sub-network of the sliding contacts reaches different stages of anisotropy in each cycle. Sliding contacts lead to a monotonic accumulation of permanent deformation per cycle in each particle. The distribution of these deformations appears to be correlated in form of vortices inside the granular assembly.