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A Comparison of Conventional Local Approach and the Short Crack Approach to Fatigue Crack Initiation at a Notch
Author(s) -
Ranganathan Narayanaswami,
Leroy Rene,
Tougui Abdellah
Publication year - 2009
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200900043
Subject(s) - materials science , structural engineering , fracture mechanics , fatigue testing , amplitude , mechanics , composite material , engineering , physics , optics
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.