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- W2005011303 abstract "Ablation phenomena of material induced by laser irradiation are complicated and it is unjustifiable to analyze them theoretically with a continuum model. In this study, atomic behavior of copper, aluminum and silicon during laser ablation is simulated applying molecular dynamics. Variation of atomic array and stress state of atoms during and after laser irradiation are shown visually. Main conclusions obtained are summarized as follows : (1) Thermal shock wave travels to interior of material with laser irradiation. Propagation velocity of thermal shock wave is equal to elastic wave velocity. (2) In ablation process, many small voids generate in the liquid phase at first. Then they become larger and larger, and adjacent voids combine each other, which develop into a relatively larger void. Finally, the vicinity of surface bounds out forming into a relatively large lump. (3) In metal, fusing atoms flow out from the molten pool and deposit around the hole by viscosity and surface tension. In silicon, on the other hand, vaporizing atoms fly to bits after interacting or colliding reciprocally, then a part of them adheres on the surface, especially deposition around the hole is remarkable. (4) The surface of generated wall of silicon is rougher comparing with metal." @default.
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- W2005011303 date "1998-01-01" @default.
- W2005011303 modified "2023-09-25" @default.
- W2005011303 title "Molecular Dynamics Simulation on Laser Ablation of Metal and Silicon." @default.
- W2005011303 doi "https://doi.org/10.2493/jjspe.64.886" @default.
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