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Journal of Applied Physics / Volume 83 / Issue 11 / CONDENSED MATTER: STRUCTURE, MECHANICAL, AND THERMAL PROPERTIES (PACS 61-68)

J. Appl. Phys. 83, 5732 (1998); http://dx.doi.org/10.1063/1.367429 (9 pages)

Dynamic stress bridging in granular material

S. G. Bardenhagen1 and J. U. Brackbill2

1Engineering, Science, and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
2Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

(Received 23 June 1997; accepted 23 February 1998)

Through numerical experiments we investigate stress localization in granular material with application to plastic-bonded explosives. The results shed light on static versus dynamic loading, and on the role of an interstitial material between grains. Under static loading, we observe stress localization and bridging in a lattice of polydisperse cylinders in two dimensions. Under dynamic loading, we observe a two wave structure with stress fingers propagating ahead of a normal compaction wave. When an interstitial material is added (a polymeric binder), force fluctuations are substantially reduced under both static and dynamic loading. Under dynamic loading, the structure of the stress wave depends upon the material properties of the binder. As the binder stiffness increases, stress fingering decreases and is replaced by a planar compaction wave. © 1998 American Institute of Physics.

© 1998 American Institute of Physics

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KEYWORDS and PACS

Keywords

shock wave effects, plastic flow, explosions, CHEMICAL EXPLOSIVES, STRESSES, POLYMERS, GRANULAR MATERIALS, SIMULATION, LOADING, DYNAMICS, COMPACTIFICATION, WAVE PROPAGATION, BINDERS

PACS

  • 81.05.Rm

    Porous materials; granular materials

  • 62.50.-p

    High-pressure effects in solids and liquids

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.367429

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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