Abstract
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.
Highlights
Carbon-fiber reinforced plastics (CFRPs) are increasingly replacing metallic materials in lightweight structures, such as aircrafts, since significant weight savings can be achieved
The first bio-composite is made of a carbon fiber fabric prepreg and a partly bio-based 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)
Summary
Carbon-fiber reinforced plastics (CFRPs) are increasingly replacing metallic materials in lightweight structures, such as aircrafts, since significant weight savings can be achieved. The environmentally friendly polymers and composite production satisfy the demand for plastic products and, at the same time, protects the environment [6] They have not yet found their way in aircraft structures, mainly due to their low mechanical properties, the lack of experience and confidence regarding their durability and the unknown electromagnetic properties [7,8]. Sensitive individuals with electromagnetic field exposure from various sources experience ill health symptoms [12]. The electrical conductivity and electromagnetic shielding effectiveness (EMSE) of two bio-composites, which are destined for use in secondary aircraft structures, have been studied by tests and numerical models
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