Abstract
We present a variational void coalescence model that includes all the essential ingredients of failure in ductile porous metals. The model is an extension of the variational void growth model by Weinberg et al. (Comput Mech 37:142-152, 2006). The extended model contains all the deformation phases in ductile porous materials, i.e. elastic deformation, plastic deformation including deviatoric and volumetric (void growth) plasticity followed by damage initiation and evolution due to void coalescence. Parametric studies have been performed to assess the model's dependence on the different input parameters. The model is then validated against uniaxial loading experiments for different materials. We finally show the model's ability to predict the damage mechanisms and fracture surface profile of a notched round bar under tension as observed in experiments.
Original language | English |
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Pages (from-to) | 185-195 |
Number of pages | 11 |
Journal | Computational Particle Mechanics |
Volume | 49 |
Issue number | 2 |
Early online date | 17 Aug 2011 |
DOIs | |
Publication status | Published - 1 Feb 2012 |
Keywords
- constitutive model
- ductile fracture
- variational constitutive updates
- void coalescence