Journal
MATERIALS
Volume 15, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/ma15238505
Keywords
discrete element method; bonded-particle model; frozen particle fluid systems; material modeling; material micromechanics; creep
Categories
Funding
- German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) [491268466]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [GRK2462]
- Hamburg University of Technology (TUHH)
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An inventive microscale simulation approach using the discrete element method (DEM) and bonded-particle model (BPM) is applied to investigate the mechanics of frozen particle fluid systems (PFS). The study reveals that strain rate significantly affects the mechanical behavior and properties of the agglomerates, leading to the development of a new solid bond model for describing the rheology of the frozen particle fluid systems.
An inventive microscale simulation approach is applied to investigate the mechanics of frozen particle fluid systems (PFS). The simulation is based on the discrete element method (DEM) and bonded-particle model (BPM) approach. Discrete particles connected by solid bonds represent frozen agglomerates. Uniaxial compression experiments were performed to gather data for material modeling and further simulation model validation. Different typical mechanical behavior (brittle, ductile, dilatant) were reviewed regarding strain rates, saturation levels, and particle mechanical or surface properties. Among all these factors, strain rate significantly affects the mechanical behavior and properties of the agglomerates. A new solid bond model considering strain-dependent and time-dependent behavior is developed for describing the rheology of the frozen particle fluid systems. Without alternating Young's modulus and Poisson's ratio of the bond material, the developed solid model provides a suitable agreement with the experimental results regarding different strain rates.
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