Figure 3 | Scientific Reports

Figure 3

From: The Quasi-Coarse-Grained Dynamics Method to Unravel the Mesoscale Evolution of Defects/Damage during Shock Loading and Spall Failure of Polycrystalline Al Microstructures

Figure 3

The plots for the evolution of pressure during spall failure predicted by L4-QCGD simulation for a velocity of 1 km/s for the piston and pulse duration of 50 ps of 100 nm and 200 nm grain sized polycrystalline Al system are shown in (a) and (b), respectively. The distribution of number of voids and density of stair-rod dislocations as a function of sample length in the shock direction for 100 nm and 200 nm grain sized polycrystalline Al system are shown in (c) and (d) respectively. The variations in the failure behavior is observed in the snapshots showing the microstructure in (e) for the 100 nm grain sized system and in (f) for the 200 nm grain sized system at a time of 154 ps. The coloring of the atoms is used to identify defects, surface and stacking sequences using a combination of CNA and CSP values. The FCC stacked atoms are colored green, HCP stacked atoms are colored yellow, surface atoms are colored red and the disordered atoms are colored blue.

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