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Effect of oil environments on the initiation of fatigue cracks and propagation of small cracks in plain carbon steel specimens
Author(s) -
Goto M.,
Miyagawa H.,
Nisitani H.
Publication year - 1989
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010010403
Subject(s) - materials science , carbon steel , crack closure , carbon fibers , bending , fracture mechanics , fatigue testing , corrosion fatigue , composite material , metallurgy , corrosion , composite number
In fatigue tests of plain carbon steel specimens in air, fatigue life is taken up mainly by the life in which a crack propagates from its initial size up to about 1 mm. This means that the behaviour of a small crack in the oil environment must be known in order to evaluate the effect of oils on fatigue life. In this paper, using a series of base oils of different viscosity grades, the effects of oils on fatigue damage are investigated in rotating bending fatigue tests of annealed 0.34% carbon steel plain specimens. Successive detailed observations of the specimen surface are made in order to study the fatigue processes of micro‐crack initiation and small crack propagation. The physical background of the effect of oil environments on fatigue behaviour is shown, and a method for predicting fatigue life in oil environments is discussed.