A ductile fracture analysis using a local damage model
Résumé
In this study, the Gurson–Tvergaard–Needleman (GTN) model is used to investigate ductile tearing. The sensitivity of the model parameters has been examined from literature data. Three types of parameters have been reported: the “constitutive parameters” q1, q2 and q3, the “initial material and nucleation parameters” and the “critical and final failure parameters”. Each parameter in this model has been analysed in terms of various results in the literature. Both experimental and numerical results have been obtained for notched round and CT specimens to characterize ductile failure in a NiCr steel (12NC6) with a small initial void volume fraction f0 (f0=0.001%). Ductile crack growth, defined by the J–Δa curve, has been correctly simulated using the numerical calculations by adjusting the different parameters of the GTN model in the calibration procedure.