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Noise Reduktion in the Design of Structural Members made of Layered Polymer Composites Utilizing Finite-Damping-Elements

Schrader, E. and Hanselka, H. (1997) Noise Reduktion in the Design of Structural Members made of Layered Polymer Composites Utilizing Finite-Damping-Elements. In: Materials, Functionality & Design, Vol 4. NETHERLANDS SOCIETY FOR MATERIALS SCIENCE. 5th European Conference on Advanced Materials and Processes and Applications (Euromat 97), Maastricht, NL, 21-23. April 1997.

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Abstract

The dynamic behaviour of structures depends on stiffness, mass, geometry and damping. Due to the high difference in damping ratios of fibre and viscoelastic resin, the damping ratio of composites varies with the mode of vibration. For a unidirectional reinforced specimen, the damping for a torsional mode is much higher than for a bending mode in the fibre direction. There are well-known methods available in the literature to determine the modal damping ratios of composites. They are based either on energy balancing or on complex modulus. Using classical laminate theory, one needs three independent input-values in addition to the elastic properties to describe the damping behaviour of a unidirectional reinforced layer. A first order shear deformation theory for transversally isotropic material requires one additional damping ratio corresponding to the interlaminar shear stresses in (2-3)-direction. Based on the Whitney-Pagano laminate theory, an energy-based method has been developed to determine all four damping-ratios from Finite-Element calculations and measurement results. In that way a full set of damping-ratios is determined. Using these values as input, a Finite-Element tool to optimize the modal damping behaviour of complex shell structures made of multilayer laminate has been developed.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999, monograph_id=4/511,
Title:Noise Reduktion in the Design of Structural Members made of Layered Polymer Composites Utilizing Finite-Damping-Elements
Authors:
AuthorsInstitution or Email of Authors
Schrader, E.UNSPECIFIED
Hanselka, H.UNSPECIFIED
Date:1997
Journal or Publication Title:Materials, Functionality & Design
Volume:Vol 4
Publisher:NETHERLANDS SOCIETY FOR MATERIALS SCIENCE
Status:Published
Event Title:5th European Conference on Advanced Materials and Processes and Applications (Euromat 97), Maastricht, NL, 21-23. April 1997
Organizer:Euromat
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L TG - Querschnittstechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Institut für Strukturmechanik
Deposited By: Sibylle Wolff
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 15:34

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