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7482 |
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Wednesday, May 04, 2022, Hall G2 3:00 PM Precision Melt Engineering |
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Smoothed particle hydrodynamics (SPH) method for modeling the impact in thermal spraying |
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Kevin Jasutyn* / RWTH Aachen University, Germany K. Bobzin / RWTH Aachen University, Germany H. Heinemann/ RWTH Aachen University, Germany S.R. Jeske/ RWTH Aachen University, Germany J. Bender/ RWTH Aachen University, Germany O. Mokrov/ RWTH Aachen University, Germany R. Sharma/ RWTH Aachen University, Germany Uwe Reisgen/ RWTH Aachen University, Germany |
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The coating microstructure is highly dependent on the heat transfer during droplet impact and is strongly affected by the surface temperature. To better understand the dynamics of impact and solidification in thermal spray process, a 3D SPH method for modeling the impact in thermal spraying is investigated. To simulate this process, the SPH model is applied with a semi-implicit Enthalpy-Porosity method for the mushy zone during solidification. In addition, an implicit correction for SPH simulations is presented to improve the performance and simulation stability. The results show that it is possible to simulate a molten droplet impact of the thermal spray process onto the substrate in an SPH discretization. The results are evaluated in depth and the possibility of simulating multiple splats and a coating formation is discussed. Subsequently, the developed model can be applied to predict coating properties. In conclusion, a coating build-up model with temperature dependent material properties is developed, which allows for reduced computation time compared to the conventional VOF method. |