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Effect of hold times on crack retardation in aluminum alloys

✍ Scribed by W.P. Slagle; Deepak Mahulikar; H.L. Marcus

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
793 KB
Volume
13
Category
Article
ISSN
0013-7944

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✦ Synopsis

Hold time effects on fatigue crack retardation in two high strength aluminum alloys (2219 and 7075) were studied for different metallurgical conditions. Experiments were performed in humid air as well as in vacuum. It was observed that as the hold time at zero load increased, the number of delay cycles decreased in general. This observation is then explained in terms of a strain relaxation phenomenon and a crack closure model. The data indicates that the relaxation effects were greater in humid air than in vacuum. Some visual evidence of surface hammering during retardation was found.

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