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FATIGUE CRACK TIP PLASTICITY RESULTING FROM LOAD INTERACTIONS IN AN ALUMINUM ALLOY
Author(s) -
DAVIDSON D. L.,
LANKFORD J.
Publication year - 1979
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.1460-2695.1979.tb01331.x
Subject(s) - materials science , plasticity , alloy , aluminium , metallurgy , stress (linguistics) , composite material , crack closure , structural engineering , fracture mechanics , engineering , linguistics , philosophy
Displacements in the region very near to a fatigue crack tip have been observed using a stereoimaging technique. The results of changing the minimum/maximum stress ratio, for a single overload and a single underload are given for a powder metallurgy aluminum alloy. Material motions near the crack tip are complex and depend on the loading characteristic. Compressive strain fields near the crack tip in the unloaded state were found to be highly dependent on load characteristic due to variation in reversed plasticity.