Scaling Laws in the Ductile Fracture of Metallic Crystals

摘要: We explore whether the continuum scaling behavior of fracture energy metals extends down to atomistic level. use an embedded atom method (EAM) model Ni, thus bypassing need strain-gradient plasticity at The calculations are performed with a number different 3D periodic size cells using standard molecular dynamics (MD) techniques. A void nucleus single vacancy is placed in each cell and then expanded through repeated NVT MD increments. For displacement, we determine which has lowest energy. optimal bear power-law relation opening displacement that consistent estimates based on (Fokoua et al., 2014, “Optimal Scaling Solids Undergoing Ductile Fracture by Void Sheet Formation,” Arch. Ration. Mech. Anal. (in press); Fokoua Laws for Derived From Strain-Gradient Microplasticity,” J. Phys. Solids, 62, pp. 295–311). persistence level remarkable.