Crack Length Effect on the Fracture Behavior of Single-Crystals and Bi- Crystals of Aluminum

W Velilla-Diaz and HR Zambrano, NANOMATERIALS, 11, 2783 (2021).

DOI: 10.3390/nano11112783

Molecular dynamics simulations of cracked nanocrystals of aluminum were performed in order to investigate the crack length and grain boundary effects. Atomistic models of single-crystals and bi-crystals were built considering 11 different crack lengths. Novel approaches based on fracture mechanics concepts were proposed to predict the crack length effect on single-crystals and bi-crystals. The results showed that the effect of the grain boundary on the fracture resistance was beneficial increasing the fracture toughness almost four times for bi-crystals.

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