Analytical modeling for prediction of temperature field and micro-crack depth during laser treatment of alumina for LAM
DOI:
https://doi.org/10.58368/MTT.22.6.2023.47-53Keywords:
Laser Preheating, Ceramics, Alumina, Thermal Modelling, Crack Depth PredictionAbstract
Industrial applications of structural ceramics like alumina have increased with time, due to some of their properties being superior to other metals and alloys. But machine ceramics, through conventional machining, is very difficult and expensive, while keeping its properties and integrity under control. Preheating of ceramics, prior to machining, forms thermal micro-cracks on the surface due to severe thermal stress induced which may make the machining easier by reducing the cutting force requirements. Prediction of the crack depth can be very helpful to select the appropriate depth of cut during machining of alumina for efficient machining. An analytical model has been developed for the profile prediction of temperature induced and rate of cooling during laser scanning of alumina. Further, this temperature distribution data has been used to predict the thermal stress distribution in the work piece, which can be used to predict the crack depth develop in alumina ceramic.
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