Diffraction Measurements on CPF Steel Fatigue Samples
Defence Research Establishment Atlantic Halifax, Nova Scotia Canada
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In an effort to develop a non-destructive means of quantifying fatigue damage incyclically loaded marine materials, prior to the formation of a detectable fatigue crack, a series of hour glass shaped specimens were fabricated from 350WT steel, cyclically loaded to various percentages of their fatigue crack initiation life, and examined via neutron diffraction methods. Diffraction line parameters were observed which varied strongly with distance from the waist of each speciman. These parameters correlated with the degree of induced fatigue damage.Comparisons were made between these experiments and earlier less successful similar experiments conducted on HY80 samples. The limitations and potential for the application of diffraction technologies to non-destructively define the remaining fatigue life in marine components and structures is reviewed.