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Evolution of force distribution in three-dimensional granular media
1Department of Chemical and Process Engineering, University of Surrey, Guildford GU2 5XH, England.
Summary
This study analyzes normal contact force distribution in granular materials using the discrete element method. Force distribution depends on shear history, with microstructure influencing shear strength.
Area of Science:
- Geotechnical Engineering
- Computational Mechanics
- Materials Science
Background:
- Granular materials exhibit complex stress-strain behavior.
- Microstructure, specifically contact fabric, significantly influences bulk properties.
- Understanding normal contact force distribution is crucial for predicting material response.
Purpose of the Study:
- To analyze normal contact force distribution in granular media under shear.
- To investigate the effect of microstructure (contact fabric) on stresses.
- To examine the influence of particle properties (hard/soft) and density (dense/loose) on force distribution.
Main Methods:
- Discrete Element Method (DEM) simulations.
- Use of periodic cells with nearly monodispersed spherical particles.
- Quasistatic shearing under constant mean stress.
Main Results:
- Normal force distribution is dependent on shear history.
- Interface energy has minimal impact on force distribution but improves post-peak stability.
- Hard systems show exponential decay at peak strength and bimodal distributions at other states.
- Soft systems exhibit different distributions depending on density and shear state.
Conclusions:
- Shear strength is linked to the formation of fabric anisotropy carrying strong forces.
- Microstructure plays a critical role in determining force distribution and material behavior.
- DEM is effective for simulating granular material mechanics.