High-strength aluminium alloys have been tested in torsion under liquid environments which were shown to decrease the rate of Stage II crack growth, presumably by excluding air. These environments enhance Stage I growth probably by removal of fretting product, suggesting that Mode II-Mode III crack opening is more important than Mode I and that unslipping rather than plastic blunting mechanisms are involved. Some evidence obtained from fretting fatigue tests on Al alloys and from torsion tests on 70Cu-30Zn and 18Cr-8Ni-2.5Mo stainless steel are also reported.
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