Abstract
Fatigue crack growth rates have been determined in a nickel-copper alloy in the mild test environments of vacuum and oxygen. It is found that the fatigue crack growth mode in both vacuum and oxygen is ductile and the growth rate is sensibly independent of the maximum stress intensity levels and stress intensity ratio. The growth rate is found to be lower in vacuum than in oxygen, and the growth rate dependency on the cyclic stress intensity range is more pronounced in vacuum than in oxygen. These differences in behavior may be consistent with differences in crack closure behavior for the two environments.
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Formerly Senior Staff Associate with the Science Center, Rockwell International
Formerly a Graduate Student at Columbia University
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Purushothaman, S., Richards, R.J., Tien, J.K. et al. Kinetics of environmental fatigue crack growth in nickel-copper alloy: Part I. In vacuum and oxygen. Metall Trans A 9, 1101–1105 (1978). https://doi.org/10.1007/BF02652214
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DOI: https://doi.org/10.1007/BF02652214