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
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