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Formulation explicite en tétraèdres linéaires pour la modélisation 2D et 3D de l'usinage à grande vitesse

Abstract : The aim of this work is to present a FE formulation particularly adapted to the simulation of high speed machining at the cutting edge level. The modelling should be able to detect the very local phenomena that could occur, with reasonable computation times. This code is implemented using the FE library CimLib, which offers robust adaptive non-structured remeshers and allows massive parallel computing. This work can be split in two parts. The first one consist in developing, implementing and validating an explicit type formulation, which is not sensitive to volumetric locking and allows using robust adaptive non-structured remeshers. Two formulations have been compared in the field of rapid dynamics: a semi-explicit one with mixed tetrahedral elements and RFB stabilization and an explicit one with modified linear tetrahedral elements. The second part of the work consists in applying the explicit formulation presented above to high speed machining. A thermal solver is implemented and coupled to the mechanical one. 2D micro machining simulations of Ti6Al4V orthogonal cutting are performed. Results are in very good agreement with literature, and important calculation time sparing is observed. The initiation and propagation of the adiabatic shear band in the chip can be analyzed in details. A R-adaptation procedure has been added to the normal remeshing procedure in order to be able to extend those results in 3D. We can then get closer of the real industrial processes, without loosing precision.
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Contributor : Magalie Prudon <>
Submitted on : Tuesday, August 11, 2009 - 3:37:27 PM
Last modification on : Friday, October 23, 2020 - 4:59:27 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 10:19:03 PM

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  • HAL Id : tel-00409570, version 1

Citation

Pascal de Micheli. Formulation explicite en tétraèdres linéaires pour la modélisation 2D et 3D de l'usinage à grande vitesse. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2009. Français. ⟨NNT : 2009ENMP1633⟩. ⟨tel-00409570⟩

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