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Session # 4 Micro-aspects of fatigue of metals

Session # 4 Micro-aspects of fatigue of metals. Cyclic behavior Fatigue crack nucleation/growth at the microstructural level. Cyclic stress-strain curves. Cyclic stress-strain curves. AISI 4140 steel. Thielen P.N. et al. (1976).

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Session # 4 Micro-aspects of fatigue of metals

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

  2. Cyclic stress-strain curves

  3. Cyclic stress-strain curves AISI 4140 steel Thielen P.N. et al. (1976)

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

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

  6. Cracks along PSB’s in polycrystallineAA2024-T351 Mughrabi et al. (2002)

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

  8. Crack interaction with grain boundary

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

  10. Fatigue cracks along shear bands AA 2024-T351 Single crystal SC16

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

  12. Crack interaction with grain boundaries bi-crystal AA 7075 Low grain boundary angle High grain boundary angle

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