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CRACK PROPAGATION LAWS CORRESPONDING TO A GENERALIZED EL HADDAD EQUATION
Crack Propagation Laws Corresponding to a Generalized EL Haddad Equation
M. Ciavarella
International Journal of Aerospace and Lightweight Structures (IJALS)
Editor-In-Chief
Tiejun WANG, Xi'an Jiaotong University, China
Editors
K. J. BADCOCK, University of Liverpool, UK
Daining FANG, Peking University, China
Zishun LIU, Institute of High Performance Computing, Singapore
ISSN: 2010-4286 (Print)
ISSN: 2010-4294 (Online)
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Volume: 1, Issue: 1 (2011)
The El Haddad equation permits to deal simply with both short and long cracks, and we
have recently suggested a generalization for finite life, defining a “finite life intrinsic crack
size”, as a power law of number of cycles to failure. Here, we derive the corresponding
crack propagation law, finding that it shows features similar to Paris’ law in the limit of
long cracks, but shows some dependence of the “equivalent” C,m Paris’ material’s “con-
stants” with applied stress range. The increase of crack propagation speed is obtained
for short cracks, but additional size effects are derived, which may require quantitative
validation, and correspond to the intrinsic difference with respect to the standard Paris’
law.
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Anyone challenged to make some comparison with experiments?
The comparison is not likely to bee extremely good... given the approximate nature of the law.... but this should raise some useful discussion about Paris' law and its validity... Anyone challenged??