Abstract
Copper single crystals with a high initial dislocation density or with an orientation near and on symmetry lines show an amplitude dependent modulus effect and internal friction. This effect occurs at lower strains than the effect predicted by the Granato-Lücke theory. Moreover the effect is strongly temperature dependent and in some cases almost 3 times as large as the normal effect. The extra-effect seems to be a result of intersecting dislocations.
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