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Atomistic modeling of shock-induced void collapse in copper
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color) Snapshots from an MD simulation, showing evolution of void collapse for a shock of and a void radius ( vacancies). Only defective atoms are shown. Numbers in boxes indicate time in ps after shock was applied; emission of loops starts at .

Image of FIG. 2.
FIG. 2.

(Color) Snapshots from an MD simulation for a void with ( vacancies). (a) shock. Shear loops grow with a velocity , where is the sound speed at normal conditions. Snapshot from a similar MD simulation for (b) a shock. Loops grow at nearly the sound speed . In both (a) and (b) only defective atoms are shown.

Image of FIG. 3.
FIG. 3.

(Color) Calculated stress thresholds for emission of dislocations, normalized by shear modulus , as a function of void radius, normalized to the Burgers vector . MD simulations (diamond), model from Reisman et al. (Ref. 5) (dash-dot-dot), analytical model [Eq. (1)] for different dislocation core sizes: (dashed), (solid), and (dotted). Inset: Proposed loop mechanism for void collapse: (a) shear loops and (b) prismatic loops. Successive loops are formed as the void diameter is decreased. The relative positions of the loops correspond to their sequence of generation.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Atomistic modeling of shock-induced void collapse in copper