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Research Papers

Fabrication, Testing, and Modeling of Carbon Nanotube Composites for Vibration Damping

[+] Author and Article Information
R. L. Dai

Department of Mechanical and Automation Engineering, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong

W. H. Liao1

Department of Mechanical and Automation Engineering, Chinese University of Hong Kong, Shatin, New Territories, Hong Kongwhliao@cuhk.edu.hk

1

Corresponding author.

J. Vib. Acoust 131(5), 051004 (Sep 10, 2009) (9 pages) doi:10.1115/1.3147126 History: Received June 28, 2008; Revised April 21, 2009; Published September 10, 2009

In this research, carbon nanotube (CNT) composite with epoxy resin is fabricated. The dynamic properties of the nanotube composites are evaluated. A testing apparatus for obtaining dynamic properties of composites is set up, and measurement procedures are given. In particular, the loss factors together with stiffness are measured for the specimens with different CNT weight ratios. Experimental results show that CNT additive can provide the composite with several times higher damping as compared with pure epoxy. A composite unit cell model containing a single CNT segment is developed by using the finite element method. Composite loss factors are calculated based on the average ratio of the unit cell energy loss to the unit cell energy input. Calculated loss factors under different strain are compared with experimental data. With the validated model, a parametric study is subsequently performed. Parameters, such as CNT dimension and CNT alignment orientation, are studied. The factors that lead to higher composite damping capacity are identified.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

CNT segments (circled) in matrix

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Figure 2

Experimental setup

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Figure 3

Measured loss factor versus excitation frequency

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Figure 4

Measured loss factor versus strain

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Figure 5

Measured storage modulus versus strain

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Figure 6

Finite element model of composite unit cell

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Figure 7

CNT model with sheath layer

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Figure 8

Deleted sheath elements during CNT/epoxy sliding

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Figure 9

CNT/epoxy interfacial sliding status under different strain level, (α=7.5 deg, β=90 deg, εcell=[0.0001,0.001])

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Figure 10

Comparison of loss factor between simulation and experiment

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Figure 11

Simulated composite loss factors with different critical strains

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Figure 12

Loss factor versus strain with respect to different CNT length, (CNT diameter D=20 nm; L represents CNT segment length in nanometers)

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Figure 13

Loss factor versus strain with respect to different CNT diameter, (D represents CNT diameter and CNT segment length L=200 nm)

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Figure 14

Loss factor versus strain with respect to different CNT diameter, (D represents CNT diameter and CNT segment length L=200 nm, CNT weight ratio is fixed for each case)

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Figure 15

CNT/epoxy interfacial sliding status by varying α, (α=[0 deg,90 deg], β=90 deg)

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