5篇
您的检索式：作者名="Hans J. Herrmann"
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| 1 | Modeling slow deformation of polygonal particles using DEM显示文摘We introduce two improvements in the numerical scheme to simulate collision and slow shearing of irregular particles. First, we propose an alternative approach based on simple relations to compute the frictional contact forces. The approach improves efficiency and accuracy of the Discrete Element Method (DEM) when modeling the dynamics of the granular packing. We determine the proper upper limit for the integration step in the standard numerical scheme using a wide range of material parameters. To this end, we study the kinetic energy decay in a stress controlled test between two particles. Second, we show that the usual way of defining the contact plane between two polygonal particles is, in general, not unique which leads to discontinuities in the direction of the contact plane while particles move. To solve this drawback, we introduce an accurate definition for the contact plane based on the shape of the overlap area between touching particles, which evolves continuously in time. | Andrés A. Pea Pedro G. Lind Hans J. Herrmann | 2008 | Particuology2008，6，6： | 2 |
| 2 | Flow separation in the lee side of transverse dunes: A numerical investigation显示文摘 | Volker Schatz Hans J. Herrmann | 2006 | Geomorphology2006，，1： | 2 |
| 3 | Macroscopic material properties from quasi-static, microscopic simulations of a two-dimensional shear-cell显示文摘 | Marc L?tzel Stefan Luding Hans J. Herrmann | 2000 | Granular Matter2000，，3： | 1 |
| 4 | Micromechanical investigation of granular ratcheting using a discrete model of polygonal particles显示文摘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. | Fernando Alonso-Marroquín Hans B. Mhlhaus Hans J. Herrmann | 2008 | Particuology2008，6，6： | 1 |
| 5 | Macroscopic material properties from quasi-static, microscopic simulations of a two-dimensional shear-cell显示文摘 | Marc L?tzel Stefan Luding Hans J. Herrmann | 2000 | Granular Matter2000，，3： | 1 |
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