Crack Length Effect on the Fracture Behavior of Single-Crystals and Bi-Crystals of Aluminum
Wilmer Velilla-Díaz, Habib R. Zambrano
Abstract
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.
Topics & Concepts
Materials scienceFracture toughnessGrain boundaryFracture mechanicsAluminiumNanocrystalFracture (geology)Composite materialMolecular dynamicsCrystallographyMicrostructureNanotechnologyComputational chemistryChemistryMicrostructure and mechanical propertiesHigh-Velocity Impact and Material BehaviorFatigue and fracture mechanics