Journal
ENGINEERING FRACTURE MECHANICS
Volume 77, Issue 3, Pages 492-509Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2009.10.007
Keywords
Ductile fracture; Computational fracture; Shear fracture; Damage parameters
Categories
Funding
- ONR MURI
- Materials Department at the University of California, Santa Barbara
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A recent extension of the Gurson constitutive model of damage and failure of ductile structural alloys accounts for localization and crack formation under shearing as well as tension. When properly calibrated against a basic set of experiments, this model has the potential to predict the emergence and propagation of cracks over a wide range of stress states. This paper addresses procedures for calibrating the damage parameters of the extended constitutive model. The procedures are demonstrated for DH36 steel using data from three tests: (i) tension of a round bar, (ii) mode I cracking in a compact tension specimen, and (iii) shear localization and mode II cracking in a shear-off specimen. The computational model is then used to study the emergence of the cup-cone fracture mode in the neck of a round tensile bar. Ductility of a notched round bar provides additional validation. (C) 2009 Elsevier Ltd. All rights reserved.
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