Use of the Gurson-Tvergaard-Needleman (GTN) damage model to simulate small punch test on pre-cracked specimens

作者：Cuesta I I^*; Alegre J M; Barbachano H

来源：Revista de Metalurgia (Madrid), 2010, 46: 53-63.

DOI：10.3989/revmetalmadrid.05XIIPMS

• Small punch rest
• Pre-cracked specimen
• Gurson-Tvergaard-Needleman damage model
• Damage parameters
• Ductile fracture

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 pre-cracked specimens (P-SET) in order to determine the fracture properties of the material, as well. In the case of ductile material behaviour, the Gurson-Tvergaard-Needleman (GIN) damage model can he used, based on a set of constitutive parameters, to reproduce the material behaviour up to final fracture. These constitutive parameters rake 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 rests.

• 出版日期2010