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Modeling laser drilling in percussion regime using constraint natural element method

Abstract : The laser drilling process is the main process used in machining procedures on aeronautic engines, espe- cially in the cooling parts. The industrial problematic is to reduce geometrical deviations of the holes and defects dur- ing manufacturing. The interaction between a laser beam and an absorbent metallic matter in the laser drilling regime involves thermal and hydrodynamical phenomenon. Their role on the drilling is not yet completely understood and a realistic simulation of the process could contribute to a better understanding of these phenomenon. The simula- tion of such process induces strong numerical difficulties. This work presents a physical model combined with the use of the original Constraint Natural Element Method to simulate the laser drilling. The physical model includes solid/liquid and liquid/vapor phase transformations, the liq- uid ejection and the convective and conductive thermal exchanges. It is the first time that all these phenomena are included in a modelling and numerically solved in a 2D axisymmmetric problem. Simulations results predict most of measurements (hole geometry, velocity of the liquid ejection and laser drilling velocity) without adjusting any parameters.
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Jérémie Girardot, Philippe Lorong, Lounès Illoul, Nicolas Ranc, Matthieu Schneider, et al.. Modeling laser drilling in percussion regime using constraint natural element method. International Journal of Material Forming, Springer Verlag, 2015, 15 p. ⟨10.1007/s12289-015-1269-0⟩. ⟨hal-01285198⟩

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