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DEVELOPMENT OF SEMI‐ELLIPTIC FATIGUE CRACKS IN AK6 ALUMINIUM ALLOY UNDER BIAXIAL LOADING
Author(s) -
Shanyavskii A. A.
Publication year - 1996
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.1460-2695.1996.tb00180.x
Subject(s) - materials science , aluminium , tension (geology) , alloy , paris' law , stress intensity factor , instability , stress concentration , crack closure , fatigue testing , composite material , compression (physics) , aluminium alloy , stress (linguistics) , structural engineering , metallurgy , fracture mechanics , mechanics , philosophy , engineering , linguistics , physics
Fatigue mechanisms are investigated in AK6 aluminum alloy under biaxial loading. The development of a semi‐elliptic crack under conditions of biaxial compression‐tension is connected with the emergence of spherical particles. A mechanism of rotational instability is suggested, connecting the processes of particle formation with a specific mechanism of material failure. A similarity is revealed in the formation of fatigue striations within the studied ratio λ of biaxial loads from –0.9 to +0.9. As λ increases, the crack‐growth rate also increases. It is suggested that this be allowed for when introducing a correction to the mode I stress‐intensity factor.