Abstract
A characteristic feature of fatigue in many materials is the concentration of deformation into bands of intense slip. In single crystals of copper fatigued at low constant plastic strain amplitudes these "persistent slip bands" (PSB's) are first observed as the stress amplitude reaches saturation.(1,2).Their formation in the immediately succeeding cycles is rapid but after perhaps twice the number of cycles required to reach saturation the specimen enters a more stable state which is maintained until large cracks are formed near the end of the test. In this state, although PSB formation may continue slowly its rate is very much reduced - few new bands form and the existing ones do not show much increase in width. The fatigue deformation is carried in a quasi-reversible manner by the PSB's whilst the remainder of the specimen (known as the matrix) becomes inactive. At the specimen surface the PSB's are marked by intense rumpling which is known to play a part in crack formation and fatigue failure.
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