Viscoelastic And Structural Damping Analysis
Report Number: WL-TR-91-3078 Volume III, p. ICB-1 thru ICB-15
Author(s): Hilton, Harry H.
Corporate Author(s): University of Illinois at Urbana-Champaign
Date of Publication: 1991-08
Pages: 15
DoD Task:
Identifier: This paper is part of a conference proceedings. See ADA241313
Abstract:
The interrelationships between viscoelastic, Newtonian viscous and structural damping are analyzed in terms of Fourier transforms and complex moduli in the frequency domain and are also interpreted in terms of behavioral responses associated with real material compliances or moduli in the real time plane. It is shown that the correspondence between viscous and elastic structural damping is spurious, severely limited to only harmonic motion and that it does not extend to more complicated viscoelastic materials beyond Newtonian viscous flow dissipation. The dissipation energy generated by viscoelastic and structural damping is also examined. The effects of structural damping on elastic and viscoelastic bending-torsion flutter are evaluated with the help of numerical examples. The material considered is aluminum, but the analysis is general and can be applied to any viscoelastic material. It is shown that the presence of increased structural damping does not necessarily have a stabilizing effect by decreasing the viscoelastic or elastic flutter speed nor are the viscoelastic flutter speeds necessarily lower than the corresponding elastic ones.
Author(s): Hilton, Harry H.
Corporate Author(s): University of Illinois at Urbana-Champaign
Date of Publication: 1991-08
Pages: 15
DoD Task:
Identifier: This paper is part of a conference proceedings. See ADA241313
Abstract:
The interrelationships between viscoelastic, Newtonian viscous and structural damping are analyzed in terms of Fourier transforms and complex moduli in the frequency domain and are also interpreted in terms of behavioral responses associated with real material compliances or moduli in the real time plane. It is shown that the correspondence between viscous and elastic structural damping is spurious, severely limited to only harmonic motion and that it does not extend to more complicated viscoelastic materials beyond Newtonian viscous flow dissipation. The dissipation energy generated by viscoelastic and structural damping is also examined. The effects of structural damping on elastic and viscoelastic bending-torsion flutter are evaluated with the help of numerical examples. The material considered is aluminum, but the analysis is general and can be applied to any viscoelastic material. It is shown that the presence of increased structural damping does not necessarily have a stabilizing effect by decreasing the viscoelastic or elastic flutter speed nor are the viscoelastic flutter speeds necessarily lower than the corresponding elastic ones.
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This report is part of the following conference:
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Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)
WL-TR-91-3078 Volume III