A consistent use of the Gurson-Tvergaard-Needleman damage model for the R-curve calculation

Gabriele Cricrì

Abstract


The scope of the present work is to point out a consistent simulation procedure for the quasi-staticfracture processes, starting from the micro-structural characteristics of the material. To this aim, a local nineparametersGurson-Tvergaard-Needleman (GTN) damage law has been used. The damage parameters dependon the micro-structural characteristics and must be calculated, measured or opportunely tuned. This can bedone, as proposed by the author, by using an opportunely tuned GTN model for the representative volumeelement simulations, in order to enrich the original damage model by considering also the defect sizedistribution. Once determined all the material parameters, an MT fracture test has been simulated by a FE code,to calculate the R-curve in an aeronautical Al-based alloy. The simulation procedure produced results in a verygood agreement with the experimental data.

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DOI: http://dx.doi.org/10.3221%2FIGF-ESIS.24.17