Session # 4 Micro-aspects of fatigue of metals Cyclic behavior Fatigue crack nucleation/growth at the microstructural level.

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Presentation transcript:

Session # 4 Micro-aspects of fatigue of metals Cyclic behavior Fatigue crack nucleation/growth at the microstructural level

Cyclic stress-strain curves

AISI 4140 steel Thielen P.N. et al. (1976)

Monotonic and cyclic behavior of 4140, HY 130 and HY 80 steels From Kwun and Fine (1980)

Dislocation structures – persistent slip bands – TEM of copper single crystals Mughrabi et al. (1979)

Cracks along PSB’s in polycrystalline AA2024-T351 Mughrabi et al. (2002)

Dislocation structuring in a fatigued crystal (Kaneko and Hashimoto, 2003)

Crack interaction with grain boundary

MD simulation b Ladder-like structure of PSB in fatigued Cu (Suresh, 1998) MD simulation Veins formations Jin, N. Y. Acta Metallurgica, 1989 Lepisto et al. Scripta Metall. 1984

Fatigue cracks along shear bands AA 2024-T351Single crystal SC16

Atomistic simulations of FCG in copper single crystals LA [101]LA [110]

Crack interaction with grain boundaries bi-crystal AA 7075 Low grain boundary angleHigh grain boundary angle