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Phase-velocity spectra of background internal friction in polycrystalline solids
M.Capurro,P.Cirillo,R.Palazzolo 한국물리학회 2002 Current Applied Physics Vol.2 No.2
The phase-velocity spectrum of background internal friction has been shown to be a material property. The shape of such spectra seems to be dierent, in particular, for monophasic (e.g. pure metals) and multiphase materials (typically composites and rocks). Anexplanation for such dierence, as yet not known, is proposed in the present work. All spectra are interpreted to be a combination oftwo or more simple relaxation sources, each emanating from point defect diusion with a specic diusion scale length and inducingdissipation into one another. The single dissipation sources are assumed to combine with the laws of linear circuits in parallel. In thecase of monophasic metals a model with two sources of dissipation, one in the microstructure and the other in the lattice, ts theat spectra, a continuous-source model is suggested.. 2002 Elsevier Science B.V. All rights reserved.