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Small Punch Test (SPT) is a feasible alternative to determine the mechanical properties in those cases where there is not enough material for conducting conventional tests. Nowadays, there is a great interest in using this test on precracked specimens (P-SPT) in order to determine the fracture properties of the material, as well. In the case of ductile material behaviour, theGurson-Tvergaard-Needleman (GTN) damagemodel can be used, based on a set of constitutive parameters, to reproduce the material behaviour up to final fracture. These constitutive parameters take into account the nucleation, growth and coalescence of microvoids as mechanisms of damage evolution in ductile materials. The aim of this paper is to develop a methodology for the identification of these constitutive parameters, based on the numerical adjustment of the experimental results obtained from the P-SPT tests.

Aplicación del modelo de daño de Gurson-Tvergaard-Needleman (GTN) para la simulación del ensayo miniatura de punzonado sobre probetas prefisuradas