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CONSIDERATIONS OF ALLOWABLE STRESS OF CORROSION FATIGUE (FOCUSED ON THE INFLUENCE OF PITTING)
Author(s) -
Kawai S.,
Kasai K.
Publication year - 1985
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.1460-2695.1985.tb01198.x
Subject(s) - corrosion , corrosion fatigue , materials science , stress (linguistics) , surface roughness , bending , metallurgy , surface finish , stress concentration , fatigue limit , pitting corrosion , structural engineering , fracture mechanics , composite material , engineering , linguistics , philosophy
— Long life corrosion fatigue behaviour is discussed. The importance of (i) quantification of corrosion pit depth (or surface roughness caused by corrosion) as a function of service period and (ii) corrosion pit modelling is emphasized. Extreme value statistics is useful for corrosion pit depth quantification. It is demonstrated that a corrosion pit can be treated as an elliptical crack with the same depth and surface length as a pit. From these considerations, a method for determination of a reasonable allowable stress in corrosion fatigue is proposed. Finally, an example of an allowable stress is given, i.e. the allowable stresses of a real machine component under rotating bending stress are determined from estimation curves of pit depth together with corrosion fatigue crack growth data.