Schubert, H.: Grundlagen des Agglomerierens. Schubert, H.: Tensile strength of agglomerates. Rumpf, H.: The strength of granules and agglomeration. Īntonyuk, S., Palis, S., Heinrich, S.: Breakage behaviour of agglomerates and crystals by static loading and impact. The best agreement with experimental data from compression tests with titanium dioxide agglomerates was obtained by the simulation using the bonded-particle model based on the Maxwell viscoelastic model.Īntonyuk, S., Heinrich, S., Tomas, J., et al.: Energy absorption during compression and impact of dry elastic-plastic spherical granules. Moreover the results are compared with simulations using the Finite Element Method (FEM). The shape and position of the particles related to the loading direction were obtained by X-ray computer tomography and implemented in the simulations. Therefore in this study, different contact models for spherical particles and two approaches for the irregular shaped particles (multi-sphere and bonded particle models) are compared regarding the prediction of the deformation behaviour found in the experiments. Although bulk solids, processed in industry, mostly consist of irregular shaped particles, they are usually assumed to be spheres in DEM simulations which leads to many uncertainties. As model material micrometre-sized, irregular shaped titanium dioxide agglomerates and amorphous maltodextrin particles were used. For the compression behaviour, also the influence of hardening effects related to cyclic loading was investigated. In this work, a novel setup for the measurement of the contact forces and deformations during slow loading of single micrometre-sized particles in normal and shear direction under climatic conditions is developed and described. For the fast estimation of model parameters and validation of contact models, precise and robust measurement techniques are needed. To perform such a simulation the deformation behaviour of the single particles in contact with other particles and walls must be described with an appropriate contact model. This method allows to study the microprocesses in bulk solids and to analyse the different material and adhesion effects, such as the influence of capillary and solid bridges, irregular particle shape and solidification or softening of the material. Due to the rapid improvement of computational engineering, the modelling of bulk solids using the physical based Discrete Element Method (DEM) continues to gain importance. The behaviour of the bulk solids can be studied with numerical simulations. The single particle interactions determine the behaviour of bulk solids and their mechanical stability, which is decisive for the product quality. Caused by particle-particle and particle-apparatus interactions during various manufacturing processes and transportation steps, bulk solids are exposed to repeated mechanical stressing.
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