Effect of crack depth on fatigue crack growth rates for a C–Mn pipeline steel in a sour environment
作者： Colum M. Holtam , David P. Baxter , Ian A. Ashcroft , Rachel C. Thomson
DOI: 10.1016/J.IJFATIGUE.2009.06.013
关键词: Growth rate 、 Crack closure 、 Paris' law 、 Stress intensity factor 、 Composite material 、 Metallurgy 、 Materials science
摘要: Abstract Setting conditions for the avoidance of in-service crack growth in aggressive corroding environments has long been a major challenge owing to number variables that have significant effect on material behaviour. The fatigue behaviour API 5L X65 pipeline steel parent tested sour environment investigated. Fatigue rate (FCGR) tests performed evaluate influence depth (da/dN), over range 2–10 mm. results obtained showed rates deep flaws be factor 5–30 higher than air, dependent applied stress intensity (ΔK). Shallow shown grow up an order magnitude faster at same value ΔK. highlight potential non-conservatism associated with using deep-crack data predict shallow flaws. observed is attributed uptake hydrogen specimen surfaces exposed environment.
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