Table 3 Calculated values of strain rate (s−1), spall strength (GPa), and peak compressive pressure (GPa) computed using a velocity of 1 km/s and varying pulse durations for the piston for various polycrystalline Al microstructures.
Grain Size, d (nm) | System Size (nm × nm × nm) | Shock Pulse (ps) | Peak Compressive Pressure (GPa) | Strain Rate, \(\dot{\varepsilon }\) (s−1) | Atomistic Spall Strength, \({\sigma }^{At-Spall}\) (GPa) |
|---|---|---|---|---|---|
50 (MD) | 100 × 100 × 150 | 12.5 | 18.03 | 7.17 × 109 | 5.97 |
100 (L2) | 200 × 200 × 300 | 25 | 18.36 | 3.46 × 109 | 5.64 |
100 (MD) | 250 × 250 × 500 | 53 | 18.95 | 2.24 × 109 | 5.50 |
200 (L4) | 400 × 400 × 600 | 50 | 18.36 | 1.74 × 109 | 5.47 |
400 (L8) | 800 × 800 × 1200 | 100 | 18.62 | 8.17 × 108 | 5.15 |
400 (L8) | 800 × 800 × 1200 | 50 | 12.40 | 7.49 × 108 | 4.96 |
800 (L16) | 1600 × 1600 × 2400 | 200 | 17.96 | 4.43 × 108 | 4.89 |
3200 (L64) | 6400 × 6400 × 9600 | 800 | 20.82 | 1.15 × 108 | 4.47 |
3200 (L64) | 6400 × 6400 × 9600 | 100 | 9.51 | 8.93 × 107 | 3.97 |
