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- W3142613495 abstract "Single crystals of 99.98~ copper Were cyclically deformed in push-pull at 50 cps by an electrodynamical vibrator designed to make the stress amplitude independent of changes in plastic compliance of the specimen. Over a period of N cycles (280 5000 the plastic strain amplitude did not rise monotonically but showed about 20 regularly spaced, strong maxima. These slip bursts lasted typically about 50 cycles and originated from slip distributed throughout the specimen. The next burst occurred when the stress amplitude had increased by about 12~o. Observations of the influence of the rate of stress amplitude increase, unidirectional prestrain, and orientation are reported. If one Stops increasing the stress amplitude between two strain bursts at a stress amplitude of only about 1-5 kp/mm 2 and then pulls the specimen unidirectionally, a yield point with a lower yield stress is observed just at the stress where the next strain burst would have occurred had the increase of cycling stress been continued. During the subsequent yield elongation in a unidirectional test there form very strong (03 Ixm) and widely spaced (5 ~tm) slip lines. This coarse slip cannot be explained in terms of point defect clusters at the very beginning of a fatigue test of a pure metal. All of these observations can, however, be interpreted in terms of the formation and dissociation of dislocation dipoles formed by mutual trapping of dislocations of opposite sign on different slip planes. It seems reasonable that the main part of cyclic hardening is due to this mutual trapping even in tests performed so that no bursts occur. This is in agreement with the ample evidence supplied by electron microscopy that almost nothing but dipoles are observed after cyclic deformation." @default.
- W3142613495 created "2021-04-13" @default.
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- W3142613495 date "2005-01-01" @default.
- W3142613495 modified "2023-09-26" @default.
- W3142613495 title "STRAIN BURSTS DURING CYCLIC DEFORMATION AND COARSE SLIP" @default.
- W3142613495 hasPublicationYear "2005" @default.
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