Experimental and Numerical Methods to Characterize Electrical Behaviour of Carbon Fiber Composites Used in Aeronautic Industry

Piche, Alexandre; Revel, I.; Peres, Gilles

doi:10.5772/17563

Cited by 19 publications

(9 citation statements)

References 6 publications

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“…By using the value of n 1 obtained above, and assuming a frequency ω/(2π) =0.5 THz, we estimate an effective electrical conductivity of σ = 35 S/m in the central layer. While the electrical conductivity of carbon fiber composites may vary by orders of magnitude, 14 this value is within the reported range.…”

Section: Modelmentioning

confidence: 67%

Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system

2016

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A fiber-coupled Terahertz time domain spectroscopy (THz-TDS) system based on photoconductive antennas, pumped by a 100-fs fiber laser, has been used to characterize materials in transmission and reflection mode. THz images are acquired by mounting the samples under investigation on an x-y stage, which is stepped through the beam while the transmitted or reflected THz waveform is captured. The samples include a carbon fiber epoxy composite and a sandwich-structured composite panel with an aramid fiber honeycomb core in between two skin layers of fiberglass reinforced plastic. The former has an artificially induced void, and from a comparison of recorded reflected time-domain signals, with and without the void, a simple model for the structure of the composite is proposed that describes the time-domain signals reasonably well.

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Section: Modelmentioning

confidence: 67%

Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system

2016

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“…Figure 7 shows a metallized flax fiber surface with many defects, because the nickel deposit of the metallization procedure could be perfectly attached on the carbon fibers' surface, but it could not be attached on the flax fibers' surface. The measured electrical conductivities of the bio-composites lie in the area of the lower limit of the electrical conductivity of CFRPs (~12,000 S/m) [29,30].…”

Section: Electrical Conductivitymentioning

confidence: 99%

Electrical Conductivity and Electromagnetic Shielding Effectiveness of Bio-Composites

2020

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In this paper, the electrical conductivity and electromagnetic shielding effectiveness of two bio-composites are studied by experimental testing and numerical models. Two monolithic composites with partly bio-based content were manufactured. The first bio-composite is made of a carbon fiber fabric prepreg and a partly bio-based (rosin) epoxy resin (CF/Rosin). The second bio-composite is a combination of prepregs of carbon fiber fabric/epoxy resin and flax fiber fabric/epoxy resin (CF-Flax/Epoxy). A single line infusion process was used prior to the curing step in the autoclave. Both variants are exemplary for the possibility of introducing bio-based materials in high performance CFRP. In-plane and out-of-plane electrical conductivity tests were conducted according to Airbus standards AITM2 0064 and AITM2 0065, respectively. Electromagnetic shielding effectiveness tests were conducted based on the standard ASTM D 4935-10. Materials were prepared at the German Aerospace Center (DLR), while characterization tests were conducted at the University of Patras. In addition to the tests, numerical models of representative volume elements were developed, using the DIGIMAT software, to predict the electrical conductivity of the two bio-composites. The preliminary numerical results show a good agreement with the experimental results.Electromagnetic (EM) penetration of aircrafts mainly comes from lightning effects. On the other hand, lightning discharges do not necessarily have to hit the aircraft structure directly to create EM fields. Intracloud discharges, for example, might produce intense high-frequency radiation [9]. Additionally, to the lightning effects, an electromagnetically disturbed environment for the aircraft is developed from the infrastructure of all communication, entertainment and surveillance. EM radiation penetrates the aircraft from outboard ground-based transmitters for navigation, communication, radar surveillance from other aircrafts or satellite propagation, as well as from onboard generated interferences appearing by the carried onboard communication and entertainment equipment. Whereas a metallic aircraft fuselage principally counters these EM fields like a faraday cage-through its high electrical conductivity is able to deflect and absorb the radiation and provides an EM shield-a composite fuselage is not able to counter EM fields without enhancement [10,11].Studies have shown that there are several health effects caused by of electromagnetic fields. Sensitive individuals with electromagnetic field exposure from various sources experience ill health symptoms [12]. This phenomenon is called EHS (electromagnetic hypersensitivity), and according to WHO, 1%-3% of the population are affected by it [13,14]. Moreover, when passengers are exposed to the EM waves, the network of veins in high-risk organs, such as eyes, might be affected. This is due to heat build-up in the eyes by the EM waves, which could not be easily dissipated. Studies have shown that the EMF (electromagnetic fields) exposures have sign...

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“…7 shows a metallized flax fiber surface with many defects. The measured electrical conductivities of the bio-composites lie in the area of the lower limit of the electrical conductivity of CFRPs (~12,000 S/m) [11][12].…”

Section: Electrical Conductivitymentioning

confidence: 99%

Electrical Conductivity and Electromagnetic Shielding Effectiveness of Bio-Composites

Τσερπές¹,

Tzatzadakis²,

Bachmann³

2020

I European Conference on Multifunctional Structures

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In this paper, electrical conductivity and electromagnetic shielding effectiveness of two bio-composites have been studied by tests and numerical models. Two monolithic composites with partly bio-based content were manufactured. The first bio-composite is made of a carbon fibre fabric prepreg and a partly bio-based (rosin) epoxy resin (CF/Rosin). The second bio-composite is a combination of prepregs of carbon fibre fabric / epoxy resin and flax fibre fabric / epoxy resin (CF-Flax/Epoxy). A single line infusion process has been used prior to the curing step in the autoclave. Both variants are exemplary for the possibility of introducing bio-based materials in high performance CFRP. In-plane and out-of-plane electrical conductivity tests have been conducted according to Airbus standards AITM2 0064 and AITM2 0065, respectively. Electromagnetic shielding effectiveness tests have been conducted based on the standard ASTM D 4935-10. Materials were prepared at the German Aerospace Center (DLR) while characterization tests were conducted at the University of Patras. In addition to the tests, numerical models of representative volume elements have been developed using the DIGIMAT software to predict the electrical conductivity of the two bio-composites. The preliminary numerical results show a good agreement with the experimental results.

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Experimental and Numerical Methods to Characterize Electrical Behaviour of Carbon Fiber Composites Used in Aeronautic Industry

Cited by 19 publications

References 6 publications

Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system

Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system

Electrical Conductivity and Electromagnetic Shielding Effectiveness of Bio-Composites

Electrical Conductivity and Electromagnetic Shielding Effectiveness of Bio-Composites

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