Dielectric properties of woven fabric glass fiber reinforced polymer-matrix composites in the THz frequency range

Naito, Kimiyoshi; Kagawa, Yutaka; Utsuno, Seishi; Naganuma, Takeshi; Kurihara, Kanshi

doi:10.1016/j.compscitech.2009.04.001

Cited by 24 publications

(16 citation statements)

References 8 publications

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“…Dielectric property, one of the most important properties of glass fiber-reinforced composites [38], is a polarization phenomenon caused by free charge in the material and the influence of the electric field on the dipole (the negative charge moves toward the positive electrode, and the positive charge moves toward the negative electrode). Therefore, the dielectric properties of the composite are closely related to the frequency and temperature, as well as the dielectric properties and volume fraction of each component [39].…”

Section: Resultsmentioning

confidence: 99%

Glass Fiber-Reinforced Phenol Formaldehyde Resin-Based Electrical Insulating Composites Fabricated by Selective Laser Sintering

Zhou

Liu

et al. 2019

Polymers

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In this study, glass fiber (GF)/phenol formaldehyde resin (PF)/epoxy resin (EP) three-phase electrical insulating composites were fabricated by selective laser sintering (SLS) additive manufacturing technology and subsequent infiltration. In the three-phase composites, glass fibers modified by a silane coupling agent (KH-550) were used as reinforcements, phenol formaldehyde resin acted as the binder and matrix, and infiltrated epoxy resin was the filler. Mechanical and electrical properties such as tensile strength, bending strength, dielectric constant, electrical conductivity, and electric breakdown strength of the GF/PF/EP three-phase composite parts were investigated. The results indicated that after being infiltrated with EP, the bending strength and tensile strength of the GF/PF/EP composites increased by 30% and 42.8%, respectively. Moreover, the flexural strength and tensile strength of the GF/PF/EP composite increased with the increase of the glass fiber content. More importantly, the three-phase composites showed high electrical properties. Significant improvement in the dielectric constant, electric breakdown strength, and resistivity with the increase in the content of glass fiber was observed. This enables the prepared GF/PF/EP composites to form complex structural electrical insulation devices by SLS, which expands the materials and applications of additive manufacturing technology.

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Section: Resultsmentioning

confidence: 99%

Glass Fiber-Reinforced Phenol Formaldehyde Resin-Based Electrical Insulating Composites Fabricated by Selective Laser Sintering

Zhou

Liu

et al. 2019

Polymers

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“…Naito et al. [12] measured two types of GFRP composites (PW-GFRP and 8H-GFRP) using the THz-TDS system. The real parts of the complex dielectric constant for both GFRP composites were almost frequency independent, whereas the imaginary parts increased linearly with frequency.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive evaluation of glass fiber honeycomb sandwich panels using reflective terahertz imaging

Zhang

Chen

Wang

et al. 2017

Jnl of Sandwich Structures & Materials

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The glass fiber honeycomb sandwich panel is an efficient structural configuration which has been widely used in several designs related to air, sea, and land transport systems. Terahertz time domain spectroscopy technology is an effective supplementary method for nondestructive evaluation of composites. Terahertz time domain spectroscopy imaging technology in the reflection configuration was employed to detect the defects of glass fiber honeycomb sandwich panels, such as a skin-core debonding and a foreign inclusion. It was shown in systematic experimental investigation that different defects were detected through terahertz imaging based on different parameters, which were obtained by comparing and analyzing the waveforms in time and/or frequency domain between normal and defective regions of the sample.

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“…Due to these remarkable properties, THz waves have already been used to characterize various types of defects, such as impact damage, voids, delamination, and intrusions in glass fiber-reinforced composites [11,14,15,16,17]. Moreover, THz waves can also be applied to measure the optical material parameters [18] and the fiber orientation [19] for glass fiber-reinforced composites.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Polarization-resolved terahertz imaging of intra- and inter-laminar damages in hybrid fiber-reinforced composite laminate subject to low-velocity impact

Dong

Locquet

Declercq

et al. 2016

Composites Part B: Engineering

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Terahertz imaging is applied to characterize a hybrid fiber-reinforced composite laminate subject to low-velocity impact in this study. The hybrid fiberreinforced composite laminate comprises unidirectional glass/epoxy and carbon/epoxy plies with a cross-ply stack pattern. Both impact-induced intraand inter-laminar damages are successfully detected, and the damage evolution throughout the thickness is also evaluated. The interaction between the terahertz polarization and carbon-fiber orientation is investigated in detail.Inter-laminar damage at the interface and the intra-laminar damage close to the same interface can be differentiated via polarization-resolved imaging.With a parameter fitting method based on multiple regression analysis, delamination is characterized quantitatively. Terahertz C-and B-scan images

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Dielectric properties of woven fabric glass fiber reinforced polymer-matrix composites in the THz frequency range

Cited by 24 publications

References 8 publications

Glass Fiber-Reinforced Phenol Formaldehyde Resin-Based Electrical Insulating Composites Fabricated by Selective Laser Sintering

Glass Fiber-Reinforced Phenol Formaldehyde Resin-Based Electrical Insulating Composites Fabricated by Selective Laser Sintering

Nondestructive evaluation of glass fiber honeycomb sandwich panels using reflective terahertz imaging

Polarization-resolved terahertz imaging of intra- and inter-laminar damages in hybrid fiber-reinforced composite laminate subject to low-velocity impact

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