Modélisation par éléments finis de l'usinage des piéces en alliages d'aluminium AA 7175-T74
|Abstract:||This study introduces a global solution for modelling machining process of high-strength aluminium alloy (aeronautical grade). A 2D finite element model, based on a Lagrangian approach, for orthogonal cutting of an aluminum alloy allowing the formation of a chip, the calculation of the cutting forces as well as generated surface is presented. The solution was achieved using a commercial software package, ABAQUS/Explicit V6.13. The Johnson-Cook (JC) equation with damage evolution is used to describe the workpiece material behavior. The JC damage equation was used to take into account for the shear localization during the segmented chip formation. The JC coefficients are identified by material tests and machining data. The JC coefficients are identified by material tests and machining data. Coulomb-Orowan friction model has been used to characterize the sliding/sticking effects on the tool-chip interface with the friction coefficient and shear flow stress determined by force calibration and machining data, respectively. A sensitivity analysis has shown a reasonable accuracy for predicted chip geometry and cutting forces using the experimentally determined material properties and the proposed friction model. Keywords: machining, aluminum alloy, finit element, Lagrangian approach, orthogonal cutting, Johnson-Cook (JC) equation, JC damage equation, Coulomb-Orowan friction model, segmented chip, cutting forces.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||24 April 2018|
|Collection:||Thèses et mémoires|
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