Verification of Computation Theory of Stress Acting on the Bottom of a Silo
- Peter Peciar
- Slovak University of Technology in Bratislava, Slovakia
- Faculty of Mechanical Engineering, Institute of Process Engineering
- Peter Peciar
Current research work about particulate matter is mainly dealing with computer simulations of processes (such as mixing, transport, compaction etc.) and particle behavior during these processes. DEM (Discrete Element Method) is one of these methods. DEM´s primary advantage is that it considers every particle as a distinct element, and therefore it simulates not only a particle´s velocity, acceleration, displacement and rotation, but also the force interactions between particles or between particles and the geometry of the equipment as well during the process in real time. This study deals with the simulation of stress between particles in a particulate material during the process of loading its free surface by external force.
This study is focused on a comparison of the behavior of simulated material in EDEM Academic software with theoretical knowledge. Even though the difference between theory and simulation is minimal, it can be caused by a simplified model of polyethylene particles in EDEM Academic software. There can be the assumption that a great part of the pressure caused by loading weight is transferred to the walls of the cylinder due to internal friction in the material and external friction between the material and walls.
Fig. 3. Comparison of loading of surface in simulation time of 15,3 s for different types of loading weights in EDEM Academic a) 5 kg ; b) 12,5 kg ; c) 25 kg ; d) 50 kg
The EDEM has been very useful for verifying theories and experiments. For complex experiments where simple theories and experiments will not be used, the EDEM program will be irreplaceable for gaining new knowledge at a given time.