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1 Zeszyty Naukowe. Mechanika / Politechnika Opolska

1 2001

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Corrosion fatigue crack growth emanating from notches: electrochemistry and mechanical aspects

Panasyuk V., Dmytrakh I.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2001

z. 67

261-276

Corrosion fatigue emanating from semicircular notches is considered. The studies are focused on the relationship between stress field and electrochemistry in notches with the aim of understanding and prediction of the corrosion fatigue crack nucleation and growth behaviour from notch surface. It has been done for typical corrosive active system "low strength carbon steel - 3% NaCl solution", where the electrochemical metal dissolution plays a dominant role. The semicircular notch is considered both as stress concentrator and as local corrosion minicell. The early stages of corrosion fatigue at the notch bottom were determined and the existence of some critical crack density g* that causes an intensive crack coalescence and macrocrack creation has been shown. An expression predicting the formation on notch surface the characteristic density of corrosion fatigue cracks is derived as function of the synergistic action of cyclic stress and the corrosion process.