Caractérisation expérimentale et contribution à la modélisation numérique de l'endommagement en cisaillement des aciers HLE. Applications au procédé de poinçonnage

Abstract : The main objective of this thesis is to characterize the behavior anddamage of a HSLA materials during the punching process. They comprise in a firsttime, an experimental study based on micrographic observations and macroscopictests at different stress states to identify the physical mechanisms of damage set in.This study is complemented by a numerical simulation modeling of a Gurson damagemodel modified in shear case and its implementation in ABAQUS / Explicit. Anidentification strategy of material parameters based on a wide range of experimentalconfigurations has been realized. Punching tests were performed by varying thepunch-die clearance to test the predictive ability of the modified Gurson modelcompared to the standard GTN model and to decoupled criterion based on the ductilefracture initiation. The influence of the punch-die clearance blanking quality and instress and strain states levels was also highlighted. Predictions of fracture obtainedby this approach and for the material studied are in good agreement withexperimental observations. It remains to validate the model for larger couple’smaterial/process configurations and realize its concatenation with other formingprocesses.
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Mohamed Achouri. Caractérisation expérimentale et contribution à la modélisation numérique de l'endommagement en cisaillement des aciers HLE. Applications au procédé de poinçonnage. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2012. Français. ⟨NNT : 2012ENAM0038⟩. ⟨pastel-00842506⟩

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