Ductile fracture of high strength steels with morphological anisotropy. Part II: Nonlocal micromechanics-based modeling

[en] The ductile fracture behavior of a high strength steel is addressed in this two-part study using a micromechanics-based approach. The objective of Part II is to propose, identify, and validate a numerical model of ductile fracture based on the Gurson-Tvergaard-Needleman model. This model is enhanced by the Nahshon-Hutchinson shear modification in combination with the Thomason coalescence criterion within a fully nonlocal form and relying on a damage-to-crack transition technique. The material model involves parameters of different nature either related to the micro-mechanics of porous materials or to semi-empirical formalisms. The void nucleation model and elastoplastic behavior have been developed and identified in Part I. The other parameters are identified in this part using inverse modeling based on both the numerical results of void cell simulations and the experimental measurements. The model is shown to adequately predict the effect of stress triaxiality and Lode parameter on the fracture strain as well as the fracture anisotropy. While the cup-cone and slant fracture paths in the round bars and in the plane strain specimens, respectively, cannot be captured using the pure continuum approach, the damage-to-crack transition framework reproduces these experimental observations.

Research center :

A&M - Aérospatiale et Mécanique - ULiège

Disciplines :

Materials science & engineering
Mechanical engineering

Author, co-author :

Leclerc, Julien ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Computational & Multiscale Mechanics of Materials (CM3)

Martelleur, Matthieu; Université Catholique de Louvain - UCL > Institute of Mechanics, Materials and Civil Engineering

Colla, Marie Stéphane; Université Catholique de Louvain - UCL > Institute of Mechanics, Materials and Civil Engineering

Pardoen, Thomas; Université Catholique de Louvain - UCL > Institute of Mechanics, Materials and Civil Engineering

Noels, Ludovic ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Computational & Multiscale Mechanics of Materials (CM3)

Nguyen, Van Dung ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Computational & Multiscale Mechanics of Materials (CM3)

Language :

English

Title :

Ductile fracture of high strength steels with morphological anisotropy. Part II: Nonlocal micromechanics-based modeling

Publication date :

03 April 2021

Journal title :

Engineering Fracture Mechanics

ISSN :

0013-7944

eISSN :

1873-7315

Publisher :

Elsevier, Netherlands

Special issue title :

Ductile Damage Modeling

Issue :

248

Pages :

107716

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://doi.org/10.1016/j.engfracmech.2021.107716

Name of the research project :

The research has been funded by the Walloon Region under the agreement no.7581- MRIPF in the context of the 16th MECATECH call.

Funders :

DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie [BE]

Available on ORBi :

since 25 March 2021

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