Article (Scientific journals)
Damage characterization in a ferritic steel sheet: Experimental tests, parameter identification and numerical modeling
Felipe Guzmán, C.; Saavedra Flores, E. I.; Habraken, Anne
2018In International Journal of Solids and Structures, 155, p. 109-122
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Keywords :
Digital image correlation; Ductile fracture; Finite element method; Gurson model; Strain localization; Curve fitting; Damage detection; Ferrite; Ferritic steel; Hardening; Image analysis; Inverse problems; Nucleation; Sensitivity analysis; Steel sheet; Steel testing; Strain measurement; Damage characterization; Digital image correlations; Experimental evidence; Force-displacement curves; Gurson modeling; Isotropic-kinematic hardening; Strain distributions; Strain localizations; Parameter estimation
Abstract :
[en] The Gurson–Tvergaard–Needleman (GTN) model includes several parameters of different nature. Some of them have micromechanical roots while others are strictly phenomenological. Hence, a methodology should be developed in order to obtain a robust set of parameters with both numerical and physical meaning. The material parameters of the GTN model are found using an identification methodology based on experimental-numerical results. The method is applied on a DC01 ferritic steel sheet. An extended version of the Gurson model, incorporating plastic anisotropy, mixed isotropic-kinematic hardening, void nucleation, growth, coalescence and shear is used. Material parameters are obtained based on an inverse optimization and a sensitivity analysis on specimens with different geometries. The onset of coalescence, reflected as the loss of load carrying capacity in the force-displacement curve, is correctly predicted by the extended GTN model. The strain distribution, obtained by digital image correlation, is also correctly simulated. Nevertheless, the model does not to predict the increase of strain observed experimentally, because of the decoupling between hardening and the damage variable. In this respect, the article provides experimental evidence of the limitations of a GTN model based on a strain-controlled nucleation law with heuristic extensions of hardening. © 2018 Elsevier Ltd
Disciplines :
Materials science & engineering
Author, co-author :
Felipe Guzmán, C.;  Departamento de Ingeniería en Obras Civiles, Universidad de Santiago de Chile, Av. Ecuador 3659, Estación Central, Santiago, Chile
Saavedra Flores, E. I.;  Departamento de Ingeniería en Obras Civiles, Universidad de Santiago de Chile, Av. Ecuador 3659, Estación Central, Santiago, Chile
Habraken, Anne  ;  Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Damage characterization in a ferritic steel sheet: Experimental tests, parameter identification and numerical modeling
Publication date :
2018
Journal title :
International Journal of Solids and Structures
ISSN :
0020-7683
eISSN :
1879-2146
Publisher :
Elsevier Ltd
Volume :
155
Pages :
109-122
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
2.5020.11; REGULAR No.; 1160691; USA1799_SE162814
Funders :
CONICYT - Comisión Nacional de Investigación Científica y Tecnológica [CL]
Available on ORBi :
since 04 February 2019

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