PSI - Issue 26

A.V. Vakhrushev et al. / Procedia Structural Integrity 26 (2020) 256–262 Vakhrushev / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 7. The change of the structure of the model "nanoparticles - a crack in the aluminum" in time; 1 - t=6 пс ; 2 - t=36 пс ; 3 - t=66 пс ; 4 - t=96 пс ; 5- t=160 пс Another situation is observed in the interaction of nanoparticles with a crack in the system silumin consisting of 87% aluminum and 13% silicon (Fig. 8).

Fig. 8. The change of the structure of the model "nanoparticles - a crack in the silumin" in time; 1 - nanoparticles bridge; 2 -pore; time: a - t = 10 ps; b - t = 250 ps In this case, like the above, the nanoparticles are pulled into the fracture and form a "bridge" connecting the walls of the crack. However, the full overgrowing of the crack is not observed, the walls of the cracks do not pull together, and the "bridge" has remained stable over time. A pore forms in place of the fracture. For a better understanding of the process, consider the graphs of displacement and velocity of the center of mass of nanoparticles inside the crack (Fig. 9).

Fig. 9. Change in time displacement (a) and the velocity (b) of the center of mass of nanoparticles for the model "nanoparticles - a crack in the silumin"