Cure Monitoring of Matrix Resin with High-Frequency Electromagnetic Wave Transmission Line

Urabe, Kei; Takahashi, Jun-ichiro; Tsuda, Hiroshi; Kemmochi, Kiyoshi

doi:10.1106/cwfv-2mdm-yefw-v4fe

Cited by 4 publications

(4 citation statements)

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“…Then, the RI would have decreased with the progress of curing because the transmission decreased with time. This behavior in which the RI decreased with progress of curing is consistent with the results of a previous study on cure monitoring of the resin with conventional dielectric measurement [21]. The cured resin would have had an RI in a range of 1.5 to 1.6 because the transmission of cured resin (-31.1 dB) was within the range of -36.0 to -27.3 dB, the corresponding RIs of which were 1.5 and 1.6, respectively.…”

Section: Resultssupporting

confidence: 91%

Characterization of Long-period Grating Refractive Index Sensors and Their Applications

Tsuda

Urabe

2009

Sensors

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The influence of grating length and bend radius of long-period gratings (LPGs) on refractive index sensing was examined. Sensitivity to refractive indexes smaller than that of silica could be enhanced by bending LPGs. Bent LPGs lost sensitivity to refractive indexes higher than that of silica, whereas a 20-mm-long LPG arranged in a straight line had considerable sensitivity. These experimental results demonstrated that the sensitivity characteristics of LPGs to refractive index could be controlled by grating length and bend radius.

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Section: Resultssupporting

confidence: 91%

Characterization of Long-period Grating Refractive Index Sensors and Their Applications

Tsuda

Urabe

2009

Sensors

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“…In the calculation of Eq. 4, we used e r =2.7 [10] and e g =7 based on the catalog. The calculated relative permittivity of the resin mixed with glass particles, which is averaged for the lower and upper values of Eq.…”

Section: Methodsmentioning

confidence: 99%

“…This signal is expected to provide local information on the properties of the material or structure. We have conducted experimental and theoretical studies on the frequency characteristics of reflectance from two types of model transmission lines filled with epoxy resin [10]. Following this, we demonstrated that clearer information on resin flow or discontinuities in the curing stage can be obtained by the time-domain response to a step input signal [11].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Filler Distribution in Resin with an Electromagnetic Wave Transmission Line

Okabe

Urabe

2003

Advanced Composites Letters

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The authors previously presented a new method for monitoring resin flow and curing with a high-frequency electromagnetic wave transmission line constructed inside a structure. This method can provide information on discontinuities or distributions by using frequency characteristics or the time-domain response. In this paper, we applied our method for monitoring the defects in resin, such as uneven distribution of reinforcement or filler, voids or contamination, in the manufacturing process. The experimental results demonstrated the possibility of a transmission line as a monitoring tool and showed that the area with defects can be characterized by comparing with results of theoretical calculations.

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“…Other cure monitoring methods that do not use dielectric property changes have also been reported. Urabe et al presented a cure monitoring method with a high frequency electromagnetic wave transmission line [7]. They investigated applicability of the method by comparing experimental results with those of calculations.…”

Section: Introductionmentioning

confidence: 99%

Smart Cure Monitoring Method of Carbon/Epoxy Laminates Using Electric Capacitance Change with Applied Alternating Current Frequency

Inada

Todoroki

2005

KEM

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Authors have developed an electric resistance change method for delamination monitoring of carbon/epoxy composite laminates. The method employs reinforcement fibers as sensors; electrodes are co-cured. Co-cured electrodes for delamination monitoring are adopted in the present study as sensors for monitoring the degree of cure. This study proposes a new method using electrical capacitance change for monitoring the degree of cure without using additional sensors. Applying alternating current between electrodes during the cure process provides dielectric properties of carbon/epoxy composites. As with the conventional cure monitoring method using extra dielectric sensors, the degree of cure of composites is monitored by measuring the dielectric constant of composites. The dielectric constant of epoxy resin changes concomitant with change of frequency of applied alternating current (AC). Using dependency of the applied AC frequency of the dielectric constant, the degree of cure is measured directly. The proposed method is applied to single and multi-ply carbon/epoxy composite laminates. The method demonstrates excellent estimations of the degree of cure without additional sensors.

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Cure Monitoring of Matrix Resin with High-Frequency Electromagnetic Wave Transmission Line

Cited by 4 publications

References 0 publications

Characterization of Long-period Grating Refractive Index Sensors and Their Applications

Characterization of Long-period Grating Refractive Index Sensors and Their Applications

Monitoring of Filler Distribution in Resin with an Electromagnetic Wave Transmission Line

Smart Cure Monitoring Method of Carbon/Epoxy Laminates Using Electric Capacitance Change with Applied Alternating Current Frequency

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