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Effect of small scale notches on the very high cycle fatigue of AISI 310 stainless steel
Author(s) -
Khan M. K.,
Liu Y. J.,
Wang Q. Y.,
Pyoun Y. S.
Publication year - 2015
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/ffe.12229
Subject(s) - materials science , fatigue limit , lüders band , metallurgy , fatigue testing , stress concentration , slip (aerodynamics) , crack closure , composite material , fracture mechanics , microstructure , engineering , aerospace engineering
Fatigue behaviour of AISI 310 stainless steel has been investigated up to very high cycles. The fatigue crack initiation sites were found at the surface of the material. Persistent slip bands developed at the surface of the specimens led to the crack initiation. At lower stress levels, shallow persistent slip bands were found at the surface of the specimens, and the fatigue limit was obtained. Notched specimens showed lower fatigue lives. Notched specimens with higher stress concentration factor ( K t ) showed higher fatigue strength reduction factor ( K f ). It was found that shallow notches of depth ~100 µm may reduce the fatigue life substantially.