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DY: Dynamik und Statistische Physik

DY 25: Granuar Matter and Contact Dynamics I

DY 25.7: Vortrag

Dienstag, 28. März 2006, 16:00–16:15, SCH 251

Discrete element model based simulation of the sintering of powders — •Andreas Wonisch, Torsten Kraft, Michael Moseler, and Hermann Riedel — Fraunhofer-Institut für Werkstoffmechanik, Wöhlerstraße 11, 79108 Freiburg

Sintering is an important process step in powder technology in which the separate grains are bonded together by heating them at high temperature below the melting point. While this process has been successfully described by continuum-mechanics modeling there are still many open questions regarding the influence of grain rearrangement. By applying the discrete element method (DEM) we investigate how rearrangements on a microscopic scale change macroscopic properties like densification rate or viscosity. We simulate both free and pressure assisted sintering (sinter forging) by starting from a random aggregate of particles in a simulation box with periodic boundary conditions. We also observe crack formation when simulating constrained sintering with low density isotropic configuration of several hundred thousand particles. We further show how anisotropic starting configurations (e.g. from DEM powder compaction simulations) have a significant influence on the sintering behavior.