Abstract
For low amplitude fatigue of copper single crystals at room temperature, with increasing cumulative strain the PSB volume fraction increases while the cycle peak stress decreases. The cumulative strain at failure, for the same crystal size and orientation, is independent of applied amplitude. Slip within a PSB is nonuniform at any stage of fatigue. Local strains are at least an order of magnitude larger than the constant strain in PSBs required by the two phase model. Removal of the rough surface profile rejuvenates a fatigued crystal, indicating that surface geometry determines fatigue life.
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