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FRACTOGRAPHIC INVESTIGATION OF FRETTING‐WEAR AND FRETTING‐FATIGUE IN ALUMINIUM ALLOYS
Author(s) -
LEADBEATER G.,
KOVALEVSKII V. V.,
NOBLE B.,
WATERHOUSE R. B.
Publication year - 1980
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.1460-2695.1980.tb01363.x
Subject(s) - fretting , materials science , striation , paris' law , metallurgy , crack closure , aluminium , fracture mechanics , alloy , fracture (geology) , stress concentration , composite material
—A fully age hardened Al‐4%Cu‐1%Mg alloy has been subjected to plain‐fatigue and fretting‐fatigue and the resulting fracture surfaces compared. Crack initiation in the plain‐fatigue sample occurred at cracked inter‐metallic inclusions and subsequent crack growth was at 90° to the surface. Crack initiation in the fretting‐fatigue sample occurred at the edge of wear scar and subsequent crack growth was at 45° to the surface. Measurement of fatigue striation spacing on the fracture surfaces showed that, for the same applied stress, the initial crack propagation rate was an order of magnitude higher in the fretting‐fatigue sample. This accelerated crack propagation rate was maintained until the crack reached a depth of 0.5–1.0 mm; thereafter the growth rate was the same as that in the plain‐fatigue sample.