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Proceedings Paper

Vibrational reduction in integral-damped composite fan blades: experimental results
Author(s): John B. Kosmatka; Oral Mehmed
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Paper Abstract

The experimental behavior of spinning laminated composite pretwisted plates (turbo-fan blade-like) with small (less than 10% by volume) integral viscoelastic damping patches is investigated. Two different plate sets were examined. The first set investigated tailoring patch locations and definitions to damp specific modes on spinning flat graphite/epoxy plates as a function of rotational speed. The second set investigated damping patch size and location on specific modes of pretwisted (30 degrees) graphite/epoxy plates. The results reveal that: (1) significant amount of damping can be added using a small amount of damping material, (2) the damped plates experienced no failures up to the tested 28,000 g's and 750,000 cycles, (3) centrifugal loads caused an increase in bending frequencies and corresponding reductions in bending damping levels that are proportional to the bending stiffness increase, and (4) the centrifugal loads caused a decrease in torsion natural frequency and increase in damping levels of pretwisted composite plates.

Paper Details

Date Published: 16 June 1998
PDF: 13 pages
Proc. SPIE 3327, Smart Structures and Materials 1998: Passive Damping and Isolation, (16 June 1998); doi: 10.1117/12.310677
Show Author Affiliations
John B. Kosmatka, Univ. of California/San Diego (United States)
Oral Mehmed, NASA Lewis Research Ctr. (United States)

Published in SPIE Proceedings Vol. 3327:
Smart Structures and Materials 1998: Passive Damping and Isolation
L. Porter Davis, Editor(s)

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