Ein Simulationssystem für granulare Aufschüttungen aus Teilchen variabler Form
Granular materials, of which sand is the most prominent representative, are important in many fields of research. Their special properties make them important both for industrial applications and as a field of work in basic research. The present work deals with the numerical investigation of granular materials. The size scale of typical granular particles starts in the micrometre range for fine dusts. The upper limit is approximately in the range of a few kilometres particle diameter for the boulders in the rings of Saturn.
Effect of particle shape on bulk-stress-strain relations of granular materials
The effect of the particle shape on the bulk-stress-strain-relations for triaxial compression of granular media is investigated via the molecular dynamics method. It is found that crucial properties exhibited by experimental granular media cannot be reproduced by round particle simulations, but only by the use of elongated particles.
Dynamics of a Sliding Particle in a Rotating Drum
The motion of a sliding particle, influenced by friction, in a rotating drum is investigated. A differential equation is formulated for general friction laws. Assuming a constant coefficient of friction, the equation is exactly solvable. For a velocity dependent coefficient of friction, perturbation methods may be used. The nonperturbed system is solved and with the help of the averaging method, the perturbed system can be examined for periodic motions.
Discrete-Element Computation of Averaged Tensorial Fields in Sand Piles Consisting of Polygonal Particles
This work is a contribution to the understanding of the mechanical properties of non-cohesive granular materials in the presence of friction and a continuation of our previous work (Roul et al. 2010) on numerical investigation of the macroscopic mechanical properties of sand piles. Besides previous numerical results obtained for sand piles that were poured from a localized source (‘‘point source’’), we here consider sand piles that were built by adopting a ‘‘line source’’ or ‘‘raining procedure’’.
Behandlung des Schotters als Vielkörpersystem mit wechselnden Bindungen
By means of molecular dynamic simulation, each individual ballast stone in the ballast track can be simulated in the model. It is investigated to what extent it is possible to define contact force laws, material parameters and geometry variables in such a way that the resulting computational model reproduces the essential behaviour of the real system. Furthermore, possible areas of application of molecular dynamic simulation are mentioned.