Vibration of delaminated multilayer beams
Vibration of delaminated multilayer beams
The free vibration of delaminated multilayer beams is analyzed. Both the ‘free mode’ and ‘constrained mode’ analyses in the study of delamination vibration are used. Two parameters are introduced, namely, the normalized axial stiffness and the normalized bending stiffness. These parameters provide a better insight on the vibration behavior of the delaminated beam. A relative slenderness ratio specific for delamination vibration is further introduced, which is shown to influence the vibration behavior of the beam. Global, mixed and local vibration modes occur depending upon the relative slenderness ratio of the beam. In addition, for three-layer beams with double delaminations, the lower and upper bounds of the natural frequency are obtained by assuming a totally ‘free’ and totally ‘constrained’ deformations of the delaminated layers. These bounds are easy to compute and provide useful approximations.
layered structures, vibration, delamination, mechanical properties, slenderness ratio
227-236
Della, Christian N.
218552a1-70df-411c-9197-a24a243b1002
Shu, Dongwei
c54c2744-7263-43e5-8eda-7d329d44c4d8
March 2006
Della, Christian N.
218552a1-70df-411c-9197-a24a243b1002
Shu, Dongwei
c54c2744-7263-43e5-8eda-7d329d44c4d8
Abstract
The free vibration of delaminated multilayer beams is analyzed. Both the ‘free mode’ and ‘constrained mode’ analyses in the study of delamination vibration are used. Two parameters are introduced, namely, the normalized axial stiffness and the normalized bending stiffness. These parameters provide a better insight on the vibration behavior of the delaminated beam. A relative slenderness ratio specific for delamination vibration is further introduced, which is shown to influence the vibration behavior of the beam. Global, mixed and local vibration modes occur depending upon the relative slenderness ratio of the beam. In addition, for three-layer beams with double delaminations, the lower and upper bounds of the natural frequency are obtained by assuming a totally ‘free’ and totally ‘constrained’ deformations of the delaminated layers. These bounds are easy to compute and provide useful approximations.
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Submitted date: 2 August 2004
Published date: March 2006
Keywords:
layered structures, vibration, delamination, mechanical properties, slenderness ratio
Organisations:
Fluid Structure Interactions Group
Identifiers
Local EPrints ID: 50336
URI: http://eprints.soton.ac.uk/id/eprint/50336
ISSN: 1359-8368
PURE UUID: c9512de6-24d6-4968-826c-7f4874641189
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Date deposited: 18 Feb 2008
Last modified: 15 Mar 2024 10:05
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Author:
Christian N. Della
Author:
Dongwei Shu
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