Damping Performance of Cocured Composite I-Shaped Beams with Embedded Viscoelastic Layers

Chao Xu; Song Lin

doi:10.4028/www.scientific.net/AMR.79-82.1859

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Growth of Carbon Nanocoils Using Chemical Vapor Deposition
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Flexural Testing of Fiber Reinforced Polymer-Concrete Composite Bridge Superstructure
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Damping Performance of Cocured Composite I-Shaped Beams with Embedded Viscoelastic Layers
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Anti-Wear and Reduce-Friction Ability of ZrO₂/SiO₂ Self-Lubricating Composites
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Developing a New Method for the Formation of NiO Hollow Microspheres Using Yeasts as Bio-Templates
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Study on the Wear Resistance of ZnAl27 Composite Reinforced by SiC Particles
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Effects of Chlorine Ion on the Photocatalytic Activity of Cuprous Oxide Powders Prepared by Hydrothermal Method
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 79-82Damping Performance of Cocured Composite I-Shaped...

Damping Performance of Cocured Composite I-Shaped Beams with Embedded Viscoelastic Layers

Abstract:

Composite I-shaped beams are currently used in aerospace, ocean and civil engineering applications. Increasing the vibration damping of composite structures is a concerned need in those applications. This research is an effort to investigate the damping performance of composite I-shaped beams with cocured viscoelastic damping layers using finite element method and modal testing technique. A hybrid finite element model for a damped composite I-shaped beam was developed. Modal strain energy method was used to estimate the linear viscoelastic modal loss factors of the composite beams. A numerical parametric investigation was conducted to study the effects of various parameters on the dynamic properties of composite beams under free-free end boundary condition. Selective design parameters included inserting location and thickness of damping layers. Natural frequency and modal loss factor were also extracted by experimental modal analysis. Static tests were performed to obtain the loss of static stiffness for inserting soft viscoelastic layers. Experimental and analytical results show the inserting location of cocured damping layers has significant effects on the damping and there exists a critical damping layer thickness for optimal damping with less significant modal frequency decrease. Static tests results demonstrate a little loss of static stiffness for embedding low module damping layers. A careful selection of damping layer location and thickness is needed to optimize the damping benefits desirable and the mechanics stiffness reduction that can be tolerated for intergral damping composite structures.