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The effect of material hardness and mean stress on the fatigue limit of steels containing small defects
Author(s) -
KONDO Y.,
SAKAE C.,
KUBOTA M.,
KUDOU T.
Publication year - 2003
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 - 10.1046/j.1460-2695.2003.00656.x
Subject(s) - materials science , crack closure , fatigue limit , composite material , stress concentration , stress (linguistics) , fatigue testing , closure (psychology) , metallurgy , fracture mechanics , linguistics , philosophy , market economy , economics
Fatigue tests on material containing small defects were performed under a wide range of mean stress for three grades of steels with different hardness. The Δ K th of small defects had a peculiar dependency on material hardness and mean stress, which was quite different from those of long cracks or plain specimens. The crack closure of short cracks was measured. It was shown that the formation of the crack closure was affected by the material hardness and mean stress. This behaviour of crack closure resulted in characteristic fatigue limit properties of materials containing small defects.