Rheological Interpretation of Rayleigh Damping

Details Rheological Interpretation of Rayleigh Damping Rheological Interpretation of Rayleigh Damping

2009-01-23

arxiv.org/abs/0901.3717v1

Journal of Sound and Vibration 206, 5 (1997) 741-744

Physics

Classical Physics

Scientific paper

10.1006/jsvi.1997.1067

Damping is defined through various terms such as energy loss per cycle (for cyclic tests), logarithmic decrement (for vibration tests), complex modulus, rise-time or spectrum ratio (for wave propagation analysis), etc. For numerical modeling purposes, another type of damping is frequently used : it is called Rayleigh damping. It is a very convenient way of accounting for damping in numerical models, although the physical or rheological meaning of this approach is not clear. A rheological model is proposed to be related to classical Rayleigh damping : it is a generalized Maxwell model with three parameters. For moderate damping (<25%), this model perfectly coincide with Rayleigh damping approach since internal friction has the same expression in both cases and dispersive phenomena are negligible. This is illustrated by finite element (Rayleigh damping) and analytical (generalized Maxwell model) results in a simple one-dimensional case.

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