NDLI: Quantitative assessment on the orientation and distribution of carbon fibers in a conductive polymer composite using high-frequency ultrasound

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IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control - Front cover

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Low-frequency meandering piezoelectric vibration energy harvester

Self-amplified magnetoelectric properties in a dumbbell-shaped magnetostrictive/piezoelectric composite

Ferroelectrically active acoustic wave propagation

Performance analysis and receiver architectures of DCF77 radio-controlled clocks

Real-time ultrasound simulation using the GPU

Quantitative ultrasonic characterization of diffuse scatterers in the presence of structures that produce coherent echoes

Optimal sound speed estimation using modified nonlinear anisotropic diffusion to improve spatial resolution in ultrasound imaging

A reliability study of light refractive tomography utilized for noninvasive measurement of ultrasound pressure fields

Broadband generation of ultrasonic guided waves using piezoceramics and sub-band decomposition

Effect of roughness on imaging and sizing rough crack-like defects using ultrasonic arrays

Guided wave expansion in warped curvelet frames

Extracting the electromechanical coupling constant of piezoelectric thin film by the high-tone bulk acoustic resonator technique

Biological sensor based on a lateral electric field-excited resonator

Quantitative assessment on the orientation and distribution of carbon fibers in a conductive polymer composite using high-frequency ultrasound

A u-shaped linear ultrasonic motor using longitudinal vibration transducers with double feet

Theoretical modeling and equivalent electric circuit of a bimorph piezoelectric micromachined ultrasonic transducer

Investigations on AlN/sapphire piezoelectric bilayer structure for high-temperature SAW applications

Thickness-shear vibration of an AT-cut quartz resonator with a hyperbolic contour

Crystalline quality of the trigonal piezoelectric materials and effects of the extended defects

Numerical modeling of piezoelectric transducers using physical parameters

Design and performance testing of an ultrasonic linear motor with dual piezoelectric actuators

Electrode-shaping for the excitation and detection of permitted arbitrary modes in arbitrary geometries in piezoelectric resonators

Orthogonal quadratic chirp signals for simultaneous multi-zone focusing in medical ultrasound imaging

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Quantitative assessment on the orientation and distribution of carbon fibers in a conductive polymer composite using high-frequency ultrasound

Content Provider	IEEE Xplore Digital Library
Author	Yi-Hsun Lin Chih-Chung Huang Shyh-Hau Wang
Copyright Year	1986
Abstract	Conductive polymer composites, typically fabricated from a mix of conductive fillers and a polymer substrate, are commonly applied as bipolar plates in a fuel cell stack. Electrical conductivity is a crucial property that greatly depends on the distribution and orientation of the fillers. In this study, a 50-MHz ultrasound imaging system and analysis techniques capable of nondestructively assessing the properties of carbon fibers (CFs) in conductive polymer composites were developed. Composite materials containing a mix of polycarbonate substrates and 0 to 0.3 wt% of CFs were prepared using an injection molding technique. Ultrasonic A-line signals and C-scan images were acquired from each composite sample in regions at a depth of 0.15 mm beneath the sample surface (region A) and those at a depth of 0.3 mm (region B). The integrated backscatter (IB) and the Nakagami statistical parameter were calculated to quantitatively assess the samples. The area ratio, defined as the percentage of areas composed of CF images normalized by that of the whole C-scan image, was applied to further quantify the orientation of CFs perpendicular to the sample surface. Corresponding to the increase in CF concentrations from 0.1 to 0.3 wt%, the average IB and Nakagami parameter (m) of the composite samples increased from -78.10 ± 2.20 (mean ± standard deviation) to -72.66 ± 1.40 dB and from 0.024 ± 0.012 to 0.048 ± 0.011, respectively. The corresponding area ratios were respectively estimated to be 0.78 ± 0.35%, 2.33 ± 0.66%, and 2.20 ± 0.60% in region A of the samples; those of CFs with a perpendicular orientation were 0.04 ± 0.03%, 0.08 ± 0.02%, and 0.12 ± 0.05%. The area ratios in region B of the samples were calculated to be 1.19 ± 0.54%, 2.81 ± 0.42%, and 2.64 ± 0.76%, and those of CFs with a perpendicular orientation were 0.07 ± 0.04%, 0.12 ± 0.04%, and 0.14 ± 0.03%. According to the results of the orientations and ultrasonic images, CFs tended to distribute more uniformly in the deeper regions of the samples. This study validates that the distribution and orientation of CFs in conductive polymer composites could be sensitively and quantitatively assessed by high-frequency ultrasound in conjunction with current analysis methods.
File Size	1526853
File Format	PDF
ISSN	08853010
Volume Number	59
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Polymers Ultrasonic imaging Acoustics Transducers Image resolution Substrates
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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