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Title: Acceleration of Crack Growth Under Intermittent Overstressing in Different Enviorments
Author: R. Koterazawa, T. Nosho
Source: Fatigue Fract. Engng. Struct Vol 15 No 1
Publication year 1991
Document number: 1991072
Number of pages: 10
Abstract:
Fatigue carack growth behaviour under tinermittent overstressing was investigated in moist air, dry air, nitrogen and vacuum with low carbon steels sunder
tension-compression loading with a few tests under compression-tension loading. A very small number of cycles of overstress applied intermittently during a very large number
of cycles of understress below threshold caused significant acceleration, of about one hundred times, in crack growth rate as compared to the case of study cyclic stress in
the cases of moist dry air, dry air and nitrogen. In the region of low understress, the acceleration in moist air was apprecialby less than that in dry air and nitrogen due
to oxide-induced crack closure. The acceleration in vacuum was smaller than that in other inviroments over all understress levels, possibly because of rewelding. There was
no effect of an overstress sequence on the acceleration.
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