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Modélisation numérique du couplage thermo-mécanique-endommagement en transformations finies. Application à la mise en forme

Abstract : This work aims to develop a fully coupled numerical methodology required for virtual sheet or bulk metal forming. Based on the “strong” thermo-elasto-visco-plastic-damage coupling, this procedure allows the ductile damage prediction during the forming of any metallic components. This gives an efficient “virtual” way to “optimize” any forming or machining processes with respect to damage occurrence. Accordingly, we are able to avoid the damage occurrence as in deep drawing, forging and so on ... or to enhance the ductile damage initiation and growth in order to simulate any metal cutting operation. A general theoretical formulation of the fully coupled thermo-elasto-visco-plastic-damage model is developed in the framework of the irreversible thermodynamics with state variables. A special care is given to the efficient numerical integration of the fully coupled constitutive equations using an iterative (fully implicit) scheme applied to a reduced number of ordinary differential equations. The global resolution of the coupled system was carried out by using both an iterative implicit scheme with the calculation of the consistent tangent matrix (mechanical and thermal terms) and an explicit dynamic scheme using user's subroutine with ABAQUS. An adaptive meshing and remeshing procedure using BL2D adaptive mesher is used in connection with ABAQUS solver in order to enhance the numerical efficiency. Some numerical examples (uniaxial tensile test, cylinder pressing, blanking, orthogonal cutting, forging) are presented in order to discuss the capability of the fully coupled thermo-elasto-visco-plastic model to predict damage initiation and growth. Results from numerical simulations are systematically discussed and compared to the available experimental results.
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https://tel.archives-ouvertes.fr/tel-00005309
Contributor : Philippe Lestriez <>
Submitted on : Monday, March 15, 2004 - 1:46:45 PM
Last modification on : Monday, September 16, 2019 - 4:35:58 PM
Long-term archiving on: : Monday, September 20, 2010 - 11:58:25 AM

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  • HAL Id : tel-00005309, version 2

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Philippe Lestriez. Modélisation numérique du couplage thermo-mécanique-endommagement en transformations finies. Application à la mise en forme. Autre. Université de Technologie de Troyes, 2003. Français. ⟨tel-00005309v2⟩

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