%0 Book Section
%T Ductile crack growth using cohesive GTN model
%+ Laboratoire de statistique et des modélisations avancées (IRSN/PSN-RES/SEMIA/LSMA)
%+ Laboratoire de micromécanique et intégrité des structures (MIST)
%+ Mécanique Théorique, Interface, Changements d’Echelles (MéTICE)
%A Meïte, Mamadou
%A Nkoumbou Kaptchouang, Noé Brice
%A Monerie, Yann
%A Perales, Frederic
%A Vincent, Pierre Guy
%@ 978-1-4614-8968-9
%B Handbook of Damage MechanicsNano to Macro Scale for Materials and Structures
%E George Z. Voyiadjis
%I Springer
%P 1-20
%8 2021
%D 2021
%R 10.1007/978-1-4614-8968-9_70-1
%K Ductile failure
%K GTN
%K Cohesive zone model
%K Stress triaxiality
%Z Engineering Sciences [physics]Book sections
%X This chapter presents a three-dimensional simulation of ductile crack growth using a recent GTN cohesive approach. A cohesive-volumetric finite element approach is adopted. The behavior of the material is characterized by a hardening bulk constitutive law inside the finite elements together with a softening traction-separation law at the interfaces between elements. The traction-separation law recently proposed by [1] rests on the micromechanical Gurson-Tvergaard-Needleman model for ductile damage and fracture, and the reduced kinematics of a surface. It takes into account the effect of local I1 and J2 stress invariants via a dependence of the cohesive model to the surrounding bulk stress. The efficiency of this cohesive-GTN model is underlined through the 3D numerical simulation, using XPER code [35], of a compact tension test. The results show a strong tunneling in the crack front shape. The crack propagates faster at the midsection than at the side-surface. Large gradients of local stress and strain through the specimen thickness during crack growth are observed. Especially, the stress triaxiality is higher at the midsec-tion than at the side-surface, leading to more damage in the cohesive zone due to cavity growth.
%G English
%L hal-03409666
%U https://hal.science/hal-03409666
%~ IRSN
%~ CNRS
%~ LMGC
%~ MIST
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021
%~ PSNRES
%~ SEMIA