Abstract
The effect of crack closure on near-threshold fatigue crack propagation rate has been investigated in niobium-hydrogen alloys. The study was undertaken with the ultimate goal of determining the role of hydrogen in conjunction with effects of crack closure on the fatigue and embrittlement processes of niobium as a representative of group VA metals. Fatigue tests were performed at room temperature on a hydrogen-free specimen as well as specimens containing hydrogen in solid solution and in the form of hydride. Compact specimens were tested using a tension-tension loading cycle at a frequency of 4 Hz and load ratios of 0.05, 0.4 and 0.75.
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