Abstract
Fatigue crack growth rates in the on-board Compressed Natural Gas (CNG) steel cylinder (AISI 4130X grade) were obtained in air and in the simulated natural gas environment. Effects of loading frequency (1·0, 0·1 and 0·01 Hz) on corrosion fatigue crack growth rates were investigated. The maximum crack growth rate in the modified solution was about 60 times the rate in air. A maximum corrosion-assisted cracking rate of 2·0 × 10 −7 m/s was obtained. Retardation of fatigue crack growth was observed after the overloadings, equivalent to the present requalification tests of the on-board steel CNG cylinders. Ratio of the experimentally determined overload affected zone to the cyclic plane strain plastic zone varied from 0·85 to 1·91.
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