Predicting Ductile Fracture of Low Carbon Steel Sheets: Stress-based versus Mixed Stress/Strain-based Mohr-Coulomb Model - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Solids and Structures Année : 2013

Predicting Ductile Fracture of Low Carbon Steel Sheets: Stress-based versus Mixed Stress/Strain-based Mohr-Coulomb Model

Fabien Ebnöther
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Dirk Mohr
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Résumé

Two distinct implementations of the Mohr-Coulomb failure model are used in conjunction with a non-associated quadratic plasticity model to describe the onset of fracture in low carbon steel sheets. The stress-based version corresponds to the original Mohr-Coulomb model in stress space. For the mixed stress/strain-based version, the Mohr-Coulomb failure criterion is first transformed into the space of stress triaxiality, Lode angle parameter and equivalent plastic strain and then used as stress-state dependent weighting function in a damage indicator model. Basic fracture experiments including tensile specimens of different notch radii and a punch test are performed to calibrate the material parameters of the respective models. Subsequently, the models are used to predict the crack initiation in a Hasek test and during the stamping of an anticlastic structure. Unlike for the calibration experiments, the loading history during stamping is highly non-linear. Both models can be calibrated with similar accuracy, but the strain-based model predicts the instant of onset of fracture with greater accuracy in the stamping experiment which is an advantage of the empirical damage accumulation rule

Dates et versions

hal-00871614 , version 1 (09-10-2013)

Identifiants

Citer

Fabien Ebnöther, Dirk Mohr. Predicting Ductile Fracture of Low Carbon Steel Sheets: Stress-based versus Mixed Stress/Strain-based Mohr-Coulomb Model. International Journal of Solids and Structures, 2013, 50 (7-8), pp.1055-1066. ⟨10.1016/j.ijsolstr.2012.11.026⟩. ⟨hal-00871614⟩
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