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Proceedings Paper

Optimization of intrinsic damping by exploitation of fiber orientation within viscoelastic composites
Author(s): Sandra J. Bell; John Richard House; Mike D. Strode
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Paper Abstract

A mathematical model is used to describe the effect of fiber alignment on viscoelastic composite dynamic Young's Moduli and loss factors. The model, supported by experimental validation, requires the dynamic physical properties of the matrix resin for the range of operational temperatures and frequencies of interest. The model predicts that the resulting loss factor of a fiber reinforced viscoelastic resin composite behaves in an anisotropic fashion, however, damping optimization may be achieved in two different ways dependent on the angle of fiber alignment. The model predicts that the loss factors of a viscoelastic composite employing a woven roving with low modulus fibers, aligned in equal proportions at 0 degrees and 90 degrees are highest along a direction where fiber alignment angles are between 30 degrees and 60 degrees. The loss factor is a maximum when matrix resin loss factor is highest. Along a direction of 0 degrees and 90 degrees loss factors are generally lower, they no longer peak as a result of high loss factors in the matrix resin but are highest when the matrix loss modulus is a maximum. Furthermore, it is shown that increase in fiber modulus results in a decrease of composite loss factors at angles around 0 degrees and 90 degrees, but higher loss factors are obtained over a much wider range of angles that are typically between 5 degrees to 85 degrees.

Paper Details

Date Published: 1 May 1996
PDF: 12 pages
Proc. SPIE 2720, Smart Structures and Materials 1996: Passive Damping and Isolation, (1 May 1996); doi: 10.1117/12.239102
Show Author Affiliations
Sandra J. Bell, Defence Research Agency Holton Heath (United Kingdom)
John Richard House, Defence Research Agency Holton Heath (United Kingdom)
Mike D. Strode, Defence Research Agency Holton Heath (United Kingdom)


Published in SPIE Proceedings Vol. 2720:
Smart Structures and Materials 1996: Passive Damping and Isolation
Conor D. Johnson, Editor(s)

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