Figure 5: Load-CMOD curves (CT25 specimen) CONCLUSION A new ductile damage model, called GTN2P, has been formulated and implemented into the FE code CASTEM 2000. We have proposed a more practical use of the GTN model based on a two-step procedure. The results obtained by the proposed methodology are quite good. Nevertheless, it is necessary to study in more details the influence of characteristic lengths, related to the material microstructure. ACKNOWLEDGEMENTS The authors are grateful to Professor S. Degallaix from the “Ecole Centrale de Lille”, France, for providing the experimental data of the specimens. REFERENCES 1. Gurson, A.L. (1977) J. Engng. Mater. Techn. 99, 2. 2. Tvergaard, V. and Needleman, A. (1984) Acta Metall. 32, 157. 3. Chambert, J. (2001). PhD Thesis, Université Blaise Pascal, ClermontFerrand, France. 4. Perrin, G. (1992). PhD Thesis, Ecole Polytechnique, Paris. 5. Geney, Ch. (1998). PhD Thesis, Ecole Centrale de Lille, France. 6. Chambert, J., Bressolette, Ph. and Vergne, A. (2000). In: ECF13 European Conference on Fracture, 6 – 9 Sept., San Sebastian, Spain. 0 5 10 15 20 25 30 35 40 0 2 4 6 8 CMOD (mm) Load (kN) Experimental test GTN (Fc=2.69%, Ff=15%) GTN (Fc=2.69%, Ff=5.45%)
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