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EFFECT OF FATIGUE CRACK CLOSURE ON NEAR‐THRESHOLD CRACK RESISTANCE OF STRUCTURAL STEELS
Author(s) -
Romaniv O. N.,
Tkach A. N.,
Lenets Yu N.
Publication year - 1987
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.1460-2695.1987.tb00478.x
Subject(s) - crack closure , materials science , fretting , crack growth resistance curve , crack tip opening displacement , stress concentration , oxide , composite material , fracture mechanics , plasticity , closure (psychology) , paris' law , stress intensity factor , structural engineering , fracture (geology) , metallurgy , engineering , market economy , economics
— The present paper is an attempt to clarify conditions for plasticity‐induced and oxide‐induced crack closure as well as to evaluate the effect of crack closure on near‐threshold fatigue crack behaviour. The autocatalytic character of oxide formation at the crack tip has been elucidated in this study. An increase of plastic constraint at the crack tip is shown to intensify the fretting oxide formation process on the fracture surface and thus to cause an increase of the stress intensity factor range controlling the fatigue crack propagation rate. The proposed concept of stress state influence on crack closure allows us to explain the effect of specimen thickness on Δ K th .