Numerical modeling of damage evolution of DP steels on the basis of X-ray tomography measurements

[en] In order to couple the damage evolution and the stress state of DP steel grades, a new advanced GTN (Gurson-Tvergaard-Needleman) model was developed and implemented into a finite element code. This model is an extension of the original one. It takes into account the plastic anisotropy and the mixed (isotropic+ kinematic) hardening of the matrix. Two different methods to compute the void volume fraction were developed and used within the constitutive equations. The first method is new and allows the accurate modeling of the observations of damage initiation and growth in DP steels measured using high-resolution X-ray absorption tomography (Bouaziz et al., 2008; Maire et al., 2008). The second method is classic and assumes the additive decomposition of the total void volume fraction into a nucleation and a growth part. A parametric study is carried out to assess the effect of the kinematic hardening on some mechanical parameters such as the equivalent plastic strain, the triaxiality and the porosity. The numerical predictions are favorably compared to the experimental results.

Disciplines :

Materials science & engineering

Author, co-author :

Ben Bettaieb, Mohamed ; Université de Liège - ULiège > Département Argenco : Secteur MS2F > Département Argenco : Secteur MS2F

Lemoine, Xavier

Bouaziz, O.

Habraken, Anne ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo

Duchene, Laurent ; Université de Liège - ULiège > Département Argenco : Secteur MS2F > Département Argenco : Secteur MS2F

Language :

English

Title :

Numerical modeling of damage evolution of DP steels on the basis of X-ray tomography measurements

Publication date :

March 2011

Journal title :

Mechanics of Materials

ISSN :

0167-6636

Publisher :

Elsevier Science

Volume :

Issue :

Pages :

139-156

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 25 February 2011

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