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Effect of Strain Rate and stress state on ductile fracture initiation : Experiments & modeling

le 12 décembre 2013
13h30

Dirk Mohr Solid Mechanics Laboratory (CNRS-UMR 7649), Department of Mechanics, École Polytechnique, Palaiseau, France

logo école polytechnique

logo école polytechnique

This talk presents newly-developed experimental techniques for the static and dynamic plasticity and fracture testing of sheet materials under multi-axial loading conditions. The experimental results for advanced high strength steels and aluminum 2024-T351 demonstrate that ductile fracture is imminent after the localization of plastic flow within a narrow band at the microscale. Consequently, a three-dimensional unit cell model is built to predict the effect of stress state and strain rate on the onset of plastic localization. The unit cell model is built such that the stress state remains constant throughout loading. The results from a rigorous localization analysis for more than 150 different stress states confirm the experimentally observed effect of the stress triaxiality and Lode angle on the equivalent plastic strain at the instant of fracture initiation. Based on the results from experiments and localization analysis, a Hosford-Coulomb model is proposed to predict the onset of fracture in metals at low stress triaxialities.



Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi e-média
Bâtiment Léonard De Vinci de - ENS Cachan
61, avenue du Président Wilson 94230 Cachan
Plan d'accès

Agenda des séminaires 2013

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