Abstract
1. Vacuum has no effect on cyclic strain-hardening of copper at small or large strain amplitudes. A difference in the strain-hardening of the specimens tested in the intermediate strain region is determined by a shift in the vacuum of the point of transition from large-amplitude facture to small-amplitude fracture. 2. At small strains vacuum affects the crack initiation as well as its propagtion. This effect is particularly great during the crack growth stage with the result that in vacuum this stage becomes comparable in duration to the crack propagation stage. 3. At large strain amplitudes vacuum affects most the length of the crack propagation stage. 4. Two different mechanisms of the effect of vacuum on the fatigue fracture process in vacuum are observed for small-and large-amplitude strain; they are due to the homogenization of slip and to the improvement of stress relaxation conditions at the crack tip.
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