Fatigue behavior of aluminum alloys under multiaxial loading was investigated with both cast aluminum A356-T6 and wrought alloy 6063-T6. The dominant multiaxial fatigue crack preferentially nucleates from flaws like porosity and oxide films located near the free surface of the material. In the absence of the flaws, the cracking/debonding of the second phase particles dominates the crack initiation and propagation. The number of cracked/debonded particles increases with the number of cycles, but the damage rate depends on loading paths. Among various loading paths studied, the circle loading path shows the shortest fatigue life due to the development of complex dislocation substructures and severe stress concentration near grain/cell boundaries and second phase particles.
Fatigue Behavior of Aluminum Alloys under Multiaxial Loading
Sae Int. J. Mater. Manf
Sae International Journal of Materials and Manufacturing
SAE 2014 World Congress & Exhibition ; 2014
Sae International Journal of Materials and Manufacturing ; 7 , 2 ; 465-472
2014-04-01
8 pages
Aufsatz (Konferenz)
Englisch
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