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Modélisation macromécanique et micromécanique de l'usinage des composites à matrice polymère et fibres longues

Abstract : A cutting induced-damage process involving matrix cracking, fibre fracture and interlaminar delamination often occurs when machining Fiber-Reinforced Polymer material (FRP). The current work proposes numerical modelling of the chip formation and the cutting induced damage processes. Two numerical approaches have been developed to analyze the micromechanical and macromechanical aspects of the cutting process. In the micromechanical approach, the material is modelled with two distinguished phases, fibres and matrix. The characteristics of individual fibres and matrix were found to be the most important factors for evaluating chip formation, cutting forces and the induced cutting damage. In the macromechanical approach, the material is considered as being homogenous equivalent material. Two types of scheme were used to integrate the stiffness degradation concept into the material behaviour. The implicit scheme has been incorporated in Abaqus code via a User-Defined Subroutine (USFLD) to predict the initiation state of damage and its progression through the composite structure. A second scheme (explicit scheme) has been adopted to investigate the effect of the cutting conditions on the machining process. The user-subroutine VUMAT has been developed for the implementation of the damage model with the explicit scheme. The results in terms of physical mechanisms of chip formation, cutting forces and damage evolution show a good agreement with experimental data. The fibre orientation and the cutting edge radius were highlighted as the most important parameter influencing machining of fibre reinforced polymer composites
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https://pastel.archives-ouvertes.fr/pastel-00005643
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Monday, February 1, 2010 - 8:00:00 AM
Last modification on : Wednesday, November 29, 2017 - 9:42:53 AM
Long-term archiving on: : Thursday, September 16, 2010 - 11:22:56 AM

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  • HAL Id : pastel-00005643, version 1

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Larbi Lasri. Modélisation macromécanique et micromécanique de l'usinage des composites à matrice polymère et fibres longues. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2009. Français. ⟨NNT : 2009ENAM0031⟩. ⟨pastel-00005643⟩

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