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Demonstration of Powder Shear
Damping
Applied to Plates
S.W. Pulitzer III, E.E. Swanson, H. Heshmat
Boundary
and Mixed Lubrication: Science and Applications, D. Dowsen et.
al. (eds), Elsevier Science B.V., 2002 pp. 547-553.
ABSTRACT
Thin powder films have been proposed as a damping medium to overcome
the thermal and frequency limitations of viscoelastic materials. In
previous work, a fundamental characterization of the stiffness and
damping of constrained powder layers was conducted. To assess concept
feasibility, constrained powder layers were integrated into a metal
beam, and theoretical and experimental analyses showed that such layers
are a viable damping mechanism. In this paper, the application of
powder
shear dampers to a plate will be presented. A novel method for
fabricating a high temperature plate with constrained layer powder
damping will be discussed, and the results of dynamic testing will be
reviewed. A generic plate was designed and modeled using finite
elements. Mode shapes and frequencies were identified analytically and
correlated with experimental results. The theoretically optimum
locations for damping on the plate were identified and treated with
shear powder dampers.
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