Modulus Change Associated with Amplitude-Dependent Internal Friction in Crystals

概要

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The ratio of amplitude-dependent internal friction to the associated moduluschange is discussed for the case where the both quantities are due to dislocationsoscillating in the lattice. It is shown that the ratio lies between 7J and 4, whenthe motion of dislocation is limited by frictional forces. The ratio has a smallervalue, when the motion is prevented by the obstacles such as subboundaries, orwhen it is limited by tension forces.Comparison of the above results with available data on copper, copper alloysand lead shows that the experimental values of the ratio can be explained byassuming that the internal friction is due to dislocations oscillating in the lattice,where impurities are randomly distributed.
社団法人日本物理学会の論文
1983-01-15