Overview of development activities
in Code_Aster realised by the
LaMSID and external research
partners
P. Massin, LaMSID, UMR EDF-CNRS-CEA 2832(M. Guiton, M. Siavelis, I. Nistor, IFP, D. Colombo, University of Manchester, V.
Doquet LMS/X, H.N. Le, S. Mazet, N. Mahjoubi, CNRS)
Goal of the different partnerships : • Research activities that are shared with EDF and partially
financed outside of EDF• Long terms partneships are favorized
• Forms of collaborations: Master students, PhDs, post-docs, research fellows (Manchester, CNRS)
• Development, use and validation of Salomé_Méca platform• Examples : IFP, CNRS, ANR, University of Manchester
IFPAn X-FEM approach for modeling closed discontinuities under large sliding contact
Post-doc collaboration2007-2008I. NISTOR2, M.L.E. GUITON2, P. MASSIN1, N. MOES3
1 LAMSID2 IFPEN3 GeM, Ecole Centrale de Nantes
Interest for EDF : • Work on X-FEM formulation for contacting cracks following the
PhD as EDF CIFRE of Samuel Géniaut• Work on contact formulation
• Continuity of the collaboration with N. Moës• Ionel Nistor was then recruited as research engineer by EDF
R&D• Developments integrated in Code_Aster
• One publication for the LaMSID
Large rotation under small compression: input data
� Geometry:- 2D square plate with L= 40 m;- interface introduced as an inner circle with R=8 m;
� Material properties:- Young modulus 100 MPa;- Poisson’s ratio 0.3;
� Boundary conditions:- horizontal or vertical displacements are
restricted for the middle edge points;
� Loadings:- compression P=1MPa imposed on the edges;
- rigid rotation of α=90°progressively imposed on the inner disk
IFP
Large rotation under small compression: results
Displacement field evolution during the simulation Relative error of the contact pressure
distribution along the slave surface
IFP
X-FEM with contact and friction along branching surfaces
PhD Collaboration 2008-2011M. Siavelis2, M.L.E. Guiton2, P. Massin1 and N. Moës3
IFP
Interest for EDF : • Work on X-FEM formulation for crack networks with
application to fatigue• Work on contact formulation
• Work used for the PhD of J.B. Esnault for a notch-crack modelisation
• Continuity of the collaboration with N. Moës• Developments integrated in Code_Aster
• One publication for the LaMSID, one more expected
1 LAMSID2 IFPEN3 GeM, Ecole Centrale de Nantes
IFP
Mesh and fault surfaces Kinematical test with opening
3 21
Graben with fault junctions
IFP
• Extension (10 %), permanent contact without friction,
• Hyperelastic, E = 1 GPa, ν = 0.3
6 km
Graben with fault junctions
IFP
CNRS
An energy approach to predict cleavage fracture under non proportional loading
Post-doc collaboration 2010-2011
R. Bargellini1, Hoai Nam Le1, Y. Wadier1
Interest for EDF : • Comparison in between local and global approaches in case of
cleavage• Use and validation of Code_Aster models
• One publication submitted for the LaMSID
1 LAMSID
0
0,1
0,2
0,3
0,4
0,5
0 20 40 60 80 100
KJ (MPa.m1/2)
Gp (k
J/m
2 )
T=600T=400T=200T=0.0T=-200T=-400T=-600
0
500
1000
1500
2000
2500
3000
3500
4000
0 20 40 60 80 100
KJ(MPa.m1/2)
σσ σσw (M
Pa)
_
T=600T=400T=200T=0.0T=-200T=-400T=-600
Comparison of triaxiality effects on theBeremin (local) and Gp (global) approaches
CNRS
CNRSTowards a deformable multibody platform for
non smooth interactionsANR project Saladyn 2009-2012
Research Engineer 2008-2011, post-doc 2011-2012
1 LAMSID
S. Mazet1, N. Mahjoubi1
Interest for EDF : • Platform for the treatment of mulitple deformable solids in
dynamics with shocks: seismic applications on R.C. structures and components
• Coupling in between Code_Aster, LMGC 90 and Siconos• Use of Salomé_Méca platform as a coupling tool and dedicated
platform• New physics added to Code_Aster via external applications
• Use and validation of Code_Aster models
University of Manchester
A robust level set formulation for 3D X-FEM mixed mode crack propagation
simulation at high kinkanglesResearch Collaboration 2010-2011
D. Colombo1, P. Massin2
Interest for EDF : • Modern tools for crack propagation, in mixed mode and for all
kind of crack surfaces, without crack conforming to the mesh• Developments integrated in Code_Aster
• One publication for the LaMSID
1 University of Manchester2 LaMSID
Example in mixed mode I + II
University of Manchester
LMS Ecole Polytechnique
Mixed mode propagation for thin structures
Research Collaboration 2010-2013V. Doquet1, J.B. Esnault2, P. Massin2
1 LMS, Ecole Polytechnique2 LaMSID
Interest for EDF : • Validation of our developments for mixed mode propagation• Integration of new criteria for crack direction: local approach
based on stresses instead of SIF’s• Transfer of tomography images inside Salomé pré-environment
• Comparison in between Code_Aster and Cast3M• Stay up to date with respect to the state of the art.
