Molecular dynamics analyses of the femtosecond laser-induced grain boundary spallation

摘要: The previous laser-induced ablation researches by using molecular dynamics (MD) simulation are almost focused on the laser interaction with perfect single-crystal matters. result can therefore lead to underestimate yields and size distribution of ejecting clusters due without including effect grain boundary. present model standard Lennard-Jones (L-J) MD is firstly attempted study possible spallation induced femtosecond pulse at boundary for polycrystalline materials. Various incident energy densities absorption coefficient employed characterize dynamic behavior structural evolution results indicate that be one dominant factors influence occurrence mechanism interface. interfacial evaluated. critical thresholds various coefficients also identified. provide better understanding enhanced promote accuracy prediction depth through taking into account