A 2D numerical model is developed to investigate the transient dynamics of molten pool and thus the bur formation mechanism in millisecond pulsed laser drilling process. The model features the utilization of the sharp interface method for accurate consideration of the complex boundary conditions on the hole wall and a comprehensive hydrodynamic calculation for both the gaseous and liquid phases. The model gives good prediction of the bur phenomena, and more importantly, provides detailed information regarding the multi-phase interaction and its effects on hole dynamics, also on the bur formation. It is shown that different substrate can cause different coupling effects between the vapor plume and molten pool and hence produce holes of different shapes. The model gives a basic study of the bur formation during the ablation process of different metals and shows a virtual technique for the visual of the movement of melt and vapor. And the obtained results show good qualitative correspondence with experimental data.
Laser processing as laser drilling, laser welding and laser cutting, etc. is rather important in modern manufacture, and the interaction of laser and matter is a complex phenomenon which should be detailed studied in order to increase the manufacture efficiency and quality. In this paper, a two-dimensional transient numerical model was developed to study the temperature field and molten pool size during pulsed laser keyhole drilling. The volume-of-fluid method was employed to track free surfaces, and melting and evaporation enthalpy, recoil pressure, surface tension, and energy loss due to evaporating materials were considered in this model. Besides, the enthalpy-porosity technique was also applied to account for the latent heat during melting and solidification. Temperature fields and melt pool size were numerically simulated via finite element method. Moreover, the effectiveness of the developed computational procedure had been confirmed by experiments.
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