Simulation of ductile tearing during a full size test using a non local Gurson-Tvergaard-Needleman (GTN) model

Youbin Chen (1, 2) , Eric Lorentz (1) , Anna Dahl (3) , Jacques Besson (2)

1 IMSIA - UMR 9219 - Institut des Sciences de la mécanique et Applications industrielles
2 CDM - Centre des Matériaux
3 EDF R&D MMC - Matériaux et Mécanique des Composants

Ductile tearing of a full size precracked pipe is experimentally investigated. In order to model and interpret the test, the pipe material is characterized using smooth and notched tensile bars and precracked C(T) specimens. This experimental database is used to fit the parameters of the non local Gurson-Tvergaard-Needleman (GTN) proposed in [? ? ]. The model is used in finite element simulations using specific elements allowing for the control of strain/damage localization as well as volumetric locking. Mesh size independence is checked on notched tensile bars. The model is then able to represent the early stages of crack propagation in the pipe. In particular, experimentally observed crack branching is reproduced, whereas this appeared much more difficult to obtain using a local GTN model.

Mots clés: Non local GTN model; Ductile failure; Large scale test

Domaines: Mécanique des matériaux [physics.class-ph]

Youbin Chen, Eric Lorentz, Anna Dahl, Jacques Besson. Simulation of ductile tearing during a full size test using a non local Gurson-Tvergaard-Needleman (GTN) model. Engineering Fracture Mechanics, 2022, 261, pp.108226. ⟨10.1016/j.engfracmech.2021.108226⟩. ⟨hal-03799362⟩