Modeling of the contact behavior of fine adhesive particles

• Applicant: Professorin Dr. Franziska Scheffler, since 2/2016
• Subject Area: Mechanical Process Engineering
• Term: from 2010 to 2017
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 169150463

The previous DFG-project (TO 156/33-2) is continued concerning the modeling of contact behaviour of fine adhesive particles. Declared aim is the improvement of understanding of physical fundamentals in terms of approach, contact and detachment of fine, dry and adhesive particles. Therefore, the micro mechanical product properties of, alumina, silica, titanium dioxide and polystyrene will be determined using atomic force microscopy (AFM) and nanoindentation. In addition to this, uniaxial compression tests as well as biaxial compression- and shear tests will be performed for these particle systems with a home-built compression apparatus (single particle experiments) and a modified biaxialbox (particle packing), respectively. These results provides as a calibration for the numerical simulations using the discrete element method in PFC3D. The basis for this is the contact model, which was implemented in the second funding period. The aim of these simulations is to demonstrate the dominant influence of the mechanical contact properties like adhesion intensification, stiffness for the macroscopic flow properties of cohesive powders. At the end, the numerical results will be proved and evaluated for the reference particle systems by the uniaxial and biaxial compression tests (compression apparatus, biaxialbox).

• DFG Programme: Priority Programmes
• Subproject of: SPP 1486: Particles in Contact - Micromechanics, Microprocess Dynamics and Particle Collectives
• Ehemaliger Antragsteller: Professor Dr.-Ing. Jürgen Tomas, until 2/2016 (†)