Abstract
Long life corrosion fatigue tests were carried out using web-gusset-type fillet welded joints and 3% NaCl solution. In corrosive environment, fatigue cracks initiated from the bottom of corrosion pits formed along the weld toe and led specimens to failure at such a low stress range as half of the fatigue limit in air and the Sr vs Nf relationship had a linearity with a slope of about -1/3 in the range of Nf=5×105-107 cycles on a logarithmic graphpaper. Corrosion fatigue life of fillet welded joints could be accurately estimated by assuming that corrosion pits start to grow from the facet-like initial crack and by using da/dN vs ΔK relationship including corrosion pit growth rate vs ΔK relationship.
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