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Dislocation Dynamics in Fatigue

Although plasticity of metals is complicated due to the string-like nature of its elementary units, the dislocations, it is currently tried to understand various stability aspects of plasticity. Of special interest are the dislocation distributions after cyclic loading ("fatigue"). Well developed periodic patterns are observed in the spatial distribution of the dislocations. Computer simulations of the behavior of straight edge dislocations will be reported, which show that the former phenomenon may be a straight-forward consequence of the interaction between dislocations. More recent ideas to relate the problem to general concepts of non-linear dynamics are also discussed.