Cohesive GTN model for ductile fracture simulation

The present work addresses the micromechanical modeling and simulation of crack initiation propagation in ductile materials failing by void nucleation, growth coalescence. A cohesive–volumetric approach is used overall material behavior characterized both a hardening bulk constitutive law softening surface traction–separation embedded between each mesh finite element discretization. sums up across all damage processes occurring narrow strain localization band, while concerns other elasto-plastic effects. proposed cohesive zone model based on where Gurson–Tvergaard–Needleman adapted to reduced kinematics ensuring complete effect rate or stress triaxiality local plasticity growth. corresponding implemented XPER computer code using Non-Smooth Contact Dynamics method models are introduced as mixed boundary conditions volumetric element. applied standard ferritic steel. Results compared with available experimental data. efficiency cohesive-GTN underlined since shape its mechanical parameters arise directly from without any ad hoc fitting parameter.