Regensburg 2004 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.73: Poster

Donnerstag, 11. März 2004, 16:00–18:00, Poster D

Simulation of biaxial compression of two-dimensional granular materials — •Hans-Georg Matuttis and Shinichi Morita — The University of Electrocommunications, Department of Mechanical and Control Engineering, Chofu Chofugaoka 1-5-1,Tokyo 182-8585,Japan

For experimental triaxial compression of granular materials, the maximum of the yield curve corresponds to the maximum of the bulk density. After the failure sets in, the granular compressibility decreases, as does the bulk density.

In this work, we simulate a two-dimensional granular assembly of particles of various sizes and shapes (round, polygonal, elliptic, with various elongations) via molecular dynamics, hence the process corresponding to experimental tri-axial compression becomes bi-axial compression. For the given boundary conditions and size dispersions, only elongated particles with friction show the maximum of the yield curve, and a maximum of the bulk density. For round particles, we find neither a maximum in the yield curve nor in the bulk density.