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

Hsin Yi Lai, Pei Hsing Huang

研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)

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

All Science Journal Classification (ASJC) codes

  • 機械工業

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