Open AccessA GTN-like Model for Plastic Porous Materials
Author(s) -
Larbi Siad,
Sophie C. Gangloff
Publication year - 2014
Publication title -
engineering, technology and applied science research/engineering, technology and applied science research
Language(s) - English
Resource type - Journals
eISSN - 2241-4487
pISSN - 1792-8036
DOI - 10.48084/etasr.509
Subject(s) - necking , constitutive equation , materials science , softening , hardening (computing) , isotropy , invariant (physics) , mechanics , structural engineering , composite material , mathematics , finite element method , engineering , layer (electronics) , physics , quantum mechanics , mathematical physics
An extended version of the well-known Gurson-Tvergaard-Needleman (GTN) isotropic hardening model is presented in this paper. The yield function of the proposed constitutive model possesses the distinctiveness to explicitly depend upon the third stress invariant. The presented constitutive model is used to analyze the necking of a round tensile bar. As long as softening initiation of specimen is not reached, the obtained numerical results highlight similarities and good agreement with those provided by the use of the GTN model. However, discrepancy shows up as soon as specimen failure starts.