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《中国颗粒学报(英文版)》 2008-06
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Micromechanical investigation of granular ratcheting using a discrete model of polygonal particles

Fernando Alonso-Marroquína, Hans B. Mhlhausb, Hans J. Herrmannc a Earth Systems Science Computational Centre & School of Physical Sciences, The University of Queensland, Sta. Lucia, Qld 4068, Australia b Earth Systems Science Computational Centre, The University of Queensland, Sta. Lucia, Qld 4068, Australia c Institut fr Baustoffe, ETH-Henggerberg, Zrich, Switzerland  
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.
【Fund】: F. Alonso-Marroquin is the recipient of an Australian Research Council Postdoctoral Fellowship (project number DP0772409)
【CateGory Index】: TB383.3
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