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Author Wang, Xiaoliang ♦ Ye, Minyou ♦ Chen, Hongli
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ COMPRESSION ♦ DISTURBANCES ♦ DYNAMIC LOADS ♦ EXCITATION ♦ GRANULAR MATERIALS ♦ PRESSURE DEPENDENCE ♦ SPATIAL DISTRIBUTION ♦ STRESSES
Abstract Considering that fusion pebble beds are probably subjected to the cyclic compression excitation in their future applications, we presented a computational study to report the effect of mechanical cycling on the behaviors of granular matter. The correctness of our numerical experiments was confirmed by a comparison with the effective medium theory. Under the cyclic loads, the fast granular compaction was observed to evolve in a stretched exponential law. Besides, the increasing stiffening in packing structure, especially the decreasing moduli pressure dependence due to granular consolidation, was also observed. For the force chains inside the pebble beds, both the internal force distribution and the spatial distribution of force chains would become increasingly uniform as the external force perturbation proceeded and therefore produced the stress relief on grains. In this case, the originally proposed 3-parameter Mueth function was found to fail to describe the internal force distribution. Thereby, its improved functional form with 4 parameters was proposed here and proved to better fit the data. These findings will provide more detailed information on the pebble beds for the relevant fusion design and analysis.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-11-07
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 118
Issue Number 17


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