SEDL / STP / STP1304-EB / STP11757S

Amplitude-Dependent Material Damping—Old Beliefs and New Facts: Working Toward a Synthesizing Model

Gelli, D
Professor and consultant, Materials Science Department, and manager scientist and Director of the Institute, CNA/TEMPE, Milano,

Olzi, E
Professor and consultant, Materials Science Department, and manager scientist and Director of the Institute, CNA/TEMPE, Milano,

Pages: 11    Published: Jan 1997

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Abstract

A study is underway to achieve a reasonably general model for amplitude-dependent material damping. This paper illustrates the conclusions we have reached so far.

Conventional, firmly held convictions, not corroborated by subsequently produced experimental evidence, are listed and discussed. The main phenomenological features of the experimental results and the aspects common to many instances are briefly outlined. Interesting similarities between dislocation damping and other damping sources are pointed out. A line of interpretation of the updated phenomenology in the framework of a “moties-pinners” model is suggested. The prospect of an “equivalent pinned string” of a generic moty is also advanced. Lastly, some fractal features of the amplitude-dependent damping are cited.