Digital Repository, ECF14, Cracow 2002

Font Size: 
A Proposal for Parameters Identification of the GTN Model - Application to CT Specimen

Last modified: 2013-02-10


This paper deals with a new ductile fracture model based onincorporating coalescence criteria into the Gurson-Tvergaard-Needleman (GTN) model inorder to determine the critical porosity of coalescence fC and the final void volume fractionfF (GTN2P model). Because this model is only valid for axisymmetric specimens, wepropose a practical approach based on a two-step procedure. In the first step, using theGTN2P model on an axisymmetric notched tensile specimen, the parameters are identified.In the second step, the GTN model, with parameters values previously defined, is applied tostructural components or fracture specimens to predict the ductile crack growth. We haveperformed a numerical analysis of a CT25 specimen made of 16MND5 in order to validatethe proposed methodology.

Full Text: PDF