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An enhanced Lemaitre model formulation for materials processing damage computation
Abstract : The Lemaitre damage model is now widely used to deal with coupled damage analyses for various mechanical applications. In this article, different extensions of the model are presented and discussed to deal with complex multiaxial configurations--such as multi-stages bulk forming processes. A specific treatment is done to account for compressive damage growth, and a stress triaxiality cut-off value is considered to avoid any damage evolution below a critical negative triaxiality. The damage potential is also modified to deal with highly ductile materials, and the plastic strain is split into a negative part and a positive part to differentiate damage growth for compressive states of stress and for tensile states of stress. Finally, an anisotropic damage approach based on the comparison between grain flow orientation and principal loading directions is defined. A combination of these extensions is achieved within a single Lemaitre formulation. Application on different examples show the robustness and accuracy of the model defined in this paper.
Littérature citée [34 références]
https://hal-mines-paristech.archives-ouvertes.fr/hal-00521625
Contributeur : Magalie Prudon <>
Soumis le : vendredi 9 mars 2012 - 09:53:57
Dernière modification le : jeudi 24 septembre 2020 - 17:22:54
Archivage à long terme le : : jeudi 14 juin 2012 - 16:23:15
Contributeur : Magalie Prudon <>
Soumis le : vendredi 9 mars 2012 - 09:53:57
Dernière modification le : jeudi 24 septembre 2020 - 17:22:54
Archivage à long terme le : : jeudi 14 juin 2012 - 16:23:15
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