A Comparison of Conventional Local Approach and the Short Crack Approach to Fatigue Crack Initiation at a Notch

Methods to estimate fatigue crack initiation life at a notch tip are compared. The methods used determine the strain amplitudes at the notch tip using Neuber's or Glinka's approximation. In conventional approaches, equivalent‐damage levels are determined, using appropriate strain‐life rela...

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Bibliographic Details
Published in:Advanced engineering materials 2009-09, Vol.11 (9), p.742-745
Main Authors: Ranganathan, Narayanaswami, Leroy, Rene, Tougui, Abdellah
Format: Article
Language:English
Subjects:
aluminum alloys
Applied sciences
Exact sciences and technology
experimental verification
fatigue crack initiation
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
notch
short-crack approach
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Summary:Methods to estimate fatigue crack initiation life at a notch tip are compared. The methods used determine the strain amplitudes at the notch tip using Neuber's or Glinka's approximation. In conventional approaches, equivalent‐damage levels are determined, using appropriate strain‐life relationships coupled with damage‐summation models. In the short‐crack approach, a crack‐like defect is assumed to exist at the notch tip. It is shown that the short‐crack concept can be successfully applied to predict crack‐initiation behavior at a notch. Model predictions are compared with carefully designed experiments. It is shown that model predictions are very close to experimentally measured lives under an aircraft‐wing loading spectrum.
ISSN:1438-1656
1527-2648
DOI:10.1002/adem.200900043