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Volume 41 Issue 6
Jun.  2015
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(6): 1141-1146.
CHEN Hui, ZHAO Xianqiong, LIU Yilunet al. Angle of repose and contact-force distribution in granular pile under variable g[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(6): 1141-1146. doi: 10.13700/j.bh.1001-5965.2014.0468(in Chinese)
Citation: CHEN Hui, ZHAO Xianqiong, LIU Yilunet al. Angle of repose and contact-force distribution in granular pile under variable g[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(6): 1141-1146. doi: 10.13700/j.bh.1001-5965.2014.0468(in Chinese)
shu

Angle of repose and contact-force distribution in granular pile under variable g

doi: 10.13700/j.bh.1001-5965.2014.0468

  • College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

  • Received Date: 28 Jul 2014
  • Publish Date: 20 Jun 2015
    Abstract
  • Taking the discontinuity and random character of granular system into account, a kinematic model of particles was established by three-dimensional discrete element method in order to investigate the relationship between angle of repose and gravity. Accumulation process of granular pile was simulated using the model under variable gravity. The angle of repose and probabilistic distribution of contact forces were obtained in the model. Results show that the force-chain formed from contact forces within particle pile has the characteristics of structure of irregular mesh. Contact forces within particle pile are approximately log-normal distributed and there are about 65% of contacts carrying a force lower than the mean. Moreover, there are about 70% of contacts whose friction force are fully mobilized and the ratio of tangential force to normal force among the rest of contacts is uniformly distributed. The distributions of contact force of granular piles in different gravity field have similar properties. The contact forces, which are normalized with respect to particle's gravity, of piles with variable gravity have nearly the same distribution. The angle of repose is not affected by the gravity, though granular pile has a randomness property of microscopic structure.

     

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