Environmental Influences on the Aqueous Fatigue Crack Growth Rates of HY-130 Steel PDF Download
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Author: CT. Fujii Publisher: ISBN: Category : Corrosion and anti-corrosives Languages : en Pages : 13
Book Description
The influence of chloride ions, pH, potential, and chromate ions on fatigue crack growth rates of HY-130 steel in aqueous solutions were examined. Crack growth rates (da/dN) were determined as functions of stress intensity factor range (?K) over the ?K-interval of approximately 20 to 90 MPA?m, and environmental effects were evaluated by comparison with similar data for HY-130 obtained in air. All fatigue experiments were conducted at a maximum stress intensity factor (Kmax)
Author: CT. Fujii Publisher: ISBN: Category : Corrosion and anti-corrosives Languages : en Pages : 13
Book Description
The influence of chloride ions, pH, potential, and chromate ions on fatigue crack growth rates of HY-130 steel in aqueous solutions were examined. Crack growth rates (da/dN) were determined as functions of stress intensity factor range (?K) over the ?K-interval of approximately 20 to 90 MPA?m, and environmental effects were evaluated by comparison with similar data for HY-130 obtained in air. All fatigue experiments were conducted at a maximum stress intensity factor (Kmax)
Author: O. Vosikovsky Publisher: ISBN: Category : Cathodic protection Languages : en Pages : 8
Book Description
Fatigue crack growth rates over wide ranges of stress intensities (from threshold to nearly critical stress intensity) were measured on HY130 steel in 3.5% sodium chloride aqueous solution at several cyclic frequencies, stress ratios, and potentials. The growth rates are compared with reference data measured in laboratory air. The growth rate curves for both environments can be approximated by two linear sections converging at low stress intensity ranges to the same threshold, which depends only on the stress ratio. The upper parts of the lines with lower slopes converge again to the point where maximum stress intensity approaches its terminal value. As a result, the maximum environmental acceleration of crack growth appears at intermediate stress intensities, and it increases with decreasing frequency and potential. Data indicate a relatively low susceptibility of HY130 steel to corrosion fatigue. With increasing stress ratio R the fatigue crack growth threshold is shifted to lower stress intensity ranges by the same amount in both air and salt water environments. The effect of R on growth rate can be introduced into a power law expression.
Author: Gunchoo Shim Publisher: ISBN: Category : Languages : en Pages : 41
Book Description
To investigate the relationship between corrosion fatigue crack growth response of high strength steels in aqueous environments and electrochemical reactions at the crack tip, fatigue and electrochemical simulation tests were carried out on a modified HY-130 steel in acetate buffer solution. Corrosion fatigue crack growth rate were determined as a function of temperature (276 to 363 K) and frequency (0.03 to 10 Hz) under open circuit conditions. The electrochemical simulation experiments were carried out over the same range of temperatures, and measured the galvanic current transient between a clean and an oxidized surface and the corresponding mixed potential. These experiments were based on the assumption that the newly created surfaces at the crack tip and its neighboring oxidized surfaces formed a localized galvanic cell. Results from the two sets of experiments strongly suggested electrochemical reaction control of corrosion fatigue crack growth. The electrochemical experiments indicated that hydrogen evolution in this system followed the Volmer-Heyrovsky mechanism. Keywords: Environmental effects; Electrochemistry; Fracture mechanics.
Author: Ahmad Varvani Farahani Publisher: Southampton ; Boston : WIT Press ISBN: Category : Technology & Engineering Languages : en Pages : 530
Book Description
This title presents the fundamental elements and theories in fracture and damage analysis, plus the recent research and advances in the development of the analytical and practical approaches required to assess the materials damage and the durability of structures.
Author: CT. Fujii
Author: CT. Fujii
Author: T. W. Crooker
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Author: O. Vosikovsky
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Author: Gunchoo Shim
Author: Ahmad Varvani Farahani
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