Temperature plays a crucial role in the behaviour of some natural and engineered particulate fluid systems (PFS). Thus, solid bonds (ice) formation can occur when the temperature drops below the freezing point in moist or fluid-saturated PFS. Resulting in mechanical properties such as stiffness, yield, or fracture stress is of highly important in numerous applications. The main objectives of the project are:
- Development and validation of a micromechanical model of solid binding.
- Description of the mechanical properties of frozen materials using the Discrete Element Method (DEM)
Prof. Dr-Ing. habil. Dr. h.c. Stefan Heinrich, Prof. Dr.-Ing. Maksym Dosta, Prof. Dr.-Ing. Jürgen Grabe
Methods and work programme
Different experimental and numerical methods are combined to investigate the problem.
- Measurement of material parameters in dry state
- Analysis of the pore distribution and determination of the degree of saturation
- Investigation of the mechanical properties of frozen materials (stiffness and strength)
- Simulation of fracture behaviour using the Bonded-Particle Model (BPM).
- Automatic parameter adjustment for the determination of the unknown properties
The temperature range investigated is between -10°and -2°C.
Two models of the d bridges are developed:
- Bridge region - single bridges between pairs of particles
- Capillary range - bridges between more than two particles
 Dosta, M., Dale, S., Antonyuk, S., Wassgren, C.R., Heinrich, S. und Litster, S. (2016): Numerical and experimental analysis of influence of granule microstructure on ist compression breakage. Powd. Techn., 299, S. 87-97.
 Kozhar, S., Dosta, M., Antonyuk, S., Heinrich, S. und Schmidt, V. (2015): DEM simulations of amorphous irregular shaped micrometer-sized titania agglomerates at compression. Adv. Powd. Techn., 26, S. 1021-1030.
 Chan, T.T.; Heinrich, S.; Grabe, J.; Dosta, M. Microscale Modeling of Frozen Particle Fluid Systems with a Bonded-Particle Model Method. Materials 2022, 15, 8505. https://doi.org/10.3390/ma15238505