Fatigue Plastic Zone
5
Plastic zone ahead of Fatigue Crack tip
Transcript of Fatigue Plastic Zone
Plastic zone ahead of Fatigue Crack tip
Monotonic and reversed plastic zone development at tip of advancing fatigue crack
• Hahn et al. measured the reversed plastic zone dimension as
• Paris showed that the size of this smaller plastic zone was
• Plastic zone size is estimated by substituting hk for K and 2σys for σys in normal plastic zone size formula.
Plastic zone size
2
033.0
ys
cy
Kr
2
8
1
ys
ky
hr
Cyclic strain softening
Cyclic strain hardening