Mechanisms of fragmentation of Al-W granular composites under dynamic loading

Numerical simulations of Aluminum (Al) and Tungsten (W) granular composite rings under various dynamic loading conditions caused by explosive loading were examined. Three competing mechanisms of fragmentation were observed: a continuum level mechanism generating large macrocracks described by the Gr...

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Bibliographic Details
Published in:arXiv.org 2012-02
Main Authors: Olney, K L, Nesterenko, V F, Benson, D J
Format: Article
Language:English
Subjects:
Aluminum
Computer simulation
Dynamic loads
Fragmentation
Mesoscale phenomena
Microcracks
Simulation
Tungsten
Velocity gradient
Online Access:Get full text
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Summary:Numerical simulations of Aluminum (Al) and Tungsten (W) granular composite rings under various dynamic loading conditions caused by explosive loading were examined. Three competing mechanisms of fragmentation were observed: a continuum level mechanism generating large macrocracks described by the Grady-Kipp fragmentation mechanism, a mesoscale mechanism generating voids and microcracks near the initially unbonded Al/W interfaces due to tensile strains, and a mesoscale jetting due to the development of large velocity gradients between the W particles and adjacent Al. These mesoscale mechanisms can be used to tailor the size of the fragments by selecting an appropriate initial mesostructure for a given loading condition.
ISSN:2331-8422
DOI:10.48550/arxiv.1202.3383