Corrosion fatigue crack propagation rate characteristics for weldable ship and offshore steels with regard to the influence of loading frequency and saltwater temperature

• Autorzy: Jakubowski M.
• Języki publikacji: EN

Abstrakty

EN

After Vosikovsky (1975), the corrosion fatigue crack growth rate (CFCGR) characteristics have been divided into three regions. The region-III rates are very close to mechanical fatigue crack growth rates. CFCGR formulae, including the long-crack length effect (in region I only), the loading frequency effect (in region II only), and the saltwater temperature effect, have been proposed. It has been assumed that CFCGR is proportional to f –k, where f is the loading frequency and k is a constant. The averaged k-value for all steels of yield stress (YS) below 500 MPa, usually with ferrite-pearlite microstructures, is higher than that for YS > 500 MPa, usually with quenched and tempered microstructures. The temperature effect does not appear in region I below room temperature. In the remaining cases, that is, in region I for elevated temperatures and in region II for both low and elevated temperatures, the CFCGR increases with increasing temperature. Under a potential of –0.8 V, a long-crack-length effect, qualitatively similar to analogous effect for free corrosion conditions, appears.

Słowa kluczowe

EN

corrosion fatigue; crack growth rate; crack length; saltwater temperature; frequency effect; ship and offshore steels

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2017
• Tom: nr 1
• Strony: 88--99
• Opis fizyczny: Bibliogr. 32 poz., rys., tab.

Twórcy

autor

Jakubowski M.

• Narutowicza 11/12, 80-233 Gdańsk Polska

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)