A new constraint based fracture criterion for surface cracks

A new methodology for predicting the location of maximum crack extension along a surface crack front in ductile materials is presented. Three-dimensional elastic–plastic finite element analyses were used to determine the variations of a constraint parameter ( α h) based on the average opening stress...

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Bibliographic Details
Published in:Engineering fracture mechanics 2007-05, Vol.74 (8), p.1233-1242
Main Authors: Leach, A.M., Daniewicz, S.R., Newman, J.C.
Format: Article
Language:English
Subjects:
Constraint
Exact sciences and technology
FEA
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Inelasticity (thermoplasticity, viscoplasticity...)
Physics
Solid mechanics
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
Surface Crack
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Summary:A new methodology for predicting the location of maximum crack extension along a surface crack front in ductile materials is presented. Three-dimensional elastic–plastic finite element analyses were used to determine the variations of a constraint parameter ( α h) based on the average opening stress in the crack tip plastic zone and the J-integral distributions along the crack front for many surface crack configurations. Monotonic tension and bending loads are considered. The crack front constraint parameter is combined with the J-integral to characterize fracture, the critical fracture location being the location for which the product Jα h is a maximum. The criterion is verified with test results from surface cracked specimens.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2006.07.011