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Granular packings with sliding, rolling, and twisting friction
A P Santos1, Dan S Bolintineanu1, Gary S Grest1
1Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
Physical Review. E
|October 20, 2020
Summary
Frictional constraints in sphere packings, including rolling and twisting, are crucial for stability. Including these factors in models accurately reproduces experimental results for granular materials.
Area of Science:
- Physics
- Materials Science
- Granular Mechanics
Background:
- Friction and dissipative interactions cause rolling or spinning spheres to stop.
- These resistive forces alter the microstructure of granular packings by increasing motion constraints.
Purpose of the Study:
- To investigate the role of frictional constraints on the microstructure of granular sphere packings.
- To determine the conditions for achieving mechanically stable sphere packings.
Main Methods:
- Discrete element modeling simulations were used to construct sphere packings.
- Simulations implemented a range of frictional constraints under a pressure-controlled protocol.
Main Results:
- Mechanically stable packings were achieved at low volume fractions (0.53) and coordination numbers (2.5) with high resistance to sliding, rolling, and twisting.
- Experimental volume fractions were only reproduced when rolling and twisting friction were included in the particle model.
Conclusions:
- Rolling and twisting friction are essential components for accurately modeling granular sphere packings.
- The study highlights the importance of considering all dissipative interactions for understanding granular material behavior.
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