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

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

2012-02-15

arxiv.org/abs/1202.3383v2

Physics

Condensed Matter

Materials Science

10 pages, 3 figures, submitted to APL

Scientific paper

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.

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