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Fatigue crack propagation in Ti–6Al–4V subjected to high strain amplitudes
Author(s) -
ANDERSSON M.,
HANSSON T.,
PERSSON C.,
MELIN S.
Publication year - 2005
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2004.00858.x
Subject(s) - materials science , stress intensity factor , crack closure , amplitude , strain (injury) , fracture mechanics , composite material , structural engineering , intensity (physics) , drop (telecommunication) , crack growth resistance curve , optics , electrical engineering , physics , medicine , engineering
Fatigue crack propagation in circular Ti–6Al–4V specimens subjected to high strain amplitudes has been investigated. Crack closure was measured with an electrical potential‐drop technique. Closure was shown not to depend on strain ratio but to be a function of the applied strain range. At higher strain ranges, the crack was found to be closed for a smaller part of the load cycle than at lower strain ranges due to blunting of the crack tip. Furthermore, the use of a strain‐intensity approach to predict crack‐propagation rate was investigated, and it was found that for the upper parts of the d a /d N curves the effective strain intensity yields good predictions. Also, the effective stress‐intensity factor was found to collapse the d a /d N curves for different load ratios.