Journal
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
Volume 19, Issue 1, Pages 75-94Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1056789509101917
Keywords
ductile fracture; void nucleation; growth and coalescence; stress triaxiality; lode parameter; third stress invariant
Categories
Funding
- NAVSEA [05P24]
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The main purpose of this paper is to demonstrate that besides the stress triaxiality parameter, the Lode angle, which can be related to the third invariant of the deviatoric stress tensor, also has an important effect on ductile fracture. This is achieved by conducting a series of micromechanics analyses of void-containing unit cells and experimental-numerical studies of carefully designed specimens experiencing a wide range of stress states. As a result, a fracture criterion is expressed in terms of the equivalent failure strain as a function of the stress triaxiality and the Lode angle (or the third invariant of the stress deviator) and this function is calibrated for a DH36 steel plate.
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