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AN EXPERIMENTAL PARAMETER J max IN ELASTIC‐PLASTIC FATIGUE CRACK GROWTH
Author(s) -
Lu Y.L.,
Kobayashi H.
Publication year - 1996
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.1460-2695.1996.tb01043.x
Subject(s) - tearing , striation , paris' law , materials science , structural engineering , fracture (geology) , acceleration , composite material , mechanism (biology) , mechanics , crack closure , fracture mechanics , physics , engineering , classical mechanics , quantum mechanics
— Imitating Garwood's 3‐parameter technique, an experimental parameter J max was introduced to predict fatigue crack growth rate (d a /d N ) over a wide range including small scale yielding and large scale yielding. It was found that for a Δ K ‐increasing fatigue test condition, J max is a valid parameter. A significant crack growth acceleration, caused by a transition of fracture mechanism, occurs when J max = J IC The fracture mechanism involving striation formation when J max < J IC becomes ductile tearing when J max > J IC Equations to predict the effect of stress‐ratio on J max as well as on d a /d N are given.