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Investigations of technical challenges in compounding of recycled carbon fibers

Hannan Azmin, Seidlitz Holger, Krenz Jonas, Müller Marco

Zarządzanie Przedsiębiorstwem

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2023

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Vol. 26, nr 2

7--12

EN

Carbon fiber reinforced plastics (CFRP) owing to its excellent properties have found its extensive application in various fields ranging from medical to automobile and aerospace industries. This has thereby led to ever-increasing demand of carbon fiber production and as well as resulting in tonnes of carbon fiber wastes in the landfills [5]. Due to the high positive impacts of using carbon fibers, the energy intensive and cost intensive production of virgin fibers and the growing landfills are often overlooked. Hence, the need for recycling and repurposing of carbon fiber wastes have gained the significance at present day. Although various recycling technologies have been developed yet, various challenges are faced with processing of recycled carbon fibers (rCF). Besides, the desired application specific properties are not compromised for high cost and high-energy requirement. Therefore, an overall development of processing rCF is sought from not only a sustainability point but also an economic point [7]. Various efficient recycling technologies are currently operating. The challenges arises in commercializing the recycled fibers after the recycling process. The recycled fibers often require various post-processing of fibers and undergoes fiber degradation. This induces a skeptical mindset for the buyers to introduce the recycled fibers in the material ecosystem. This paper currently discusses the processing challenges of long rCF in a compounding plant. To form a closed loop, the recycled fibers are obtained from the novel thermocatalytic degassing process from the CFRP recycling pioneers in Germany, Global EnerTec AG, Guben. This plant in Guben not only recycles carbon fibers from automotive CFRP wastes but also repurposes the epoxy matrices into secondary energy sources. This paper focuses in investigating the processing of rCF obtained from a 100% recycling technology. The aim is to investigate the possible technical challenges so that the rCF can be repurposed to new product manufacturing. Thereby, addressing the concerns with the development of closed loop circular economy in recycling CFRP wastes.

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Carbon fiber reinforced polymer and tensegrity structures in search of model architectural and engineering solutions

Franta Anna, Zając Dawid

Technical Transactions

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2022

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Vol. 119, iss. 1

art. no. e2022013

EN

The current era of nanomaterials brings advancements in science and technology. This creates new solutions and possibilities in the creation of novel spatial structures. This study leads through the presentation of iconic architectural objects created with the use of high strength composite materials and tensegrity structure. Then presents the design process, numerical simulations of the three-way tensegrity grid prototype module. Static stress simulations were done within the simulation engine of the Fusion 360 software. Moreover, 1:1 scale prototype was developed. It could be used as a modular construction slab of a novel architectural design. One of the key characteristic features of high strength composite materials, high strength-to-weight ratio, combined with tensegrity structures allows to develop lightweight and hence very durable spatial structures. This gives tensegrity structures a very low dead load value as compared to traditional reinforced concrete structures. Thanks to the application of high strength and hence lightweight materials, the dead load of the prototype is only 0,18 kN/m².

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Szybkie mikrofalowe drukowanie 3D ciągłych tworzyw sztucznych wzmocnionych włóknami węglowymi

Jemielniak Krzysztof

Mechanik

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2021

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R. 94, nr 8-9

22

PL

Zastosowanie w druku 3D ciągłego tworzywa sztucznego wzmacnianego włóknem węglowym (CCFRP) i ogrzewania mikrofalowego zamiast tradycyjnego ogrzewania oporowego umożliwia natychmiastowe, objętościowe nagrzewanie, co znacznie przyspiesza wytwarzanie kompozytów.

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Effect of Composite Material Fixing on Hole Accuracy and Defects During Drilling

Ciecieląg Krzysztof

Advances in Science and Technology. Research Journal

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2021

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Vol. 15, no 3

54--65

EN

This study investigates the effect of composite material stiffness on the accuracy of drilled holes and delamination in the drilling process. Two types of composite materials were tested: glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP). The drilling process was performed using dedicated drill bits. Samples were clamped in a vice of the Avia-VMC 800 HS vertical machining center. Drilling parameters were maintained constant but unsupported element length was changed. The unsupported element length was defined as an unsupported distance between the drilled hole axis and the sample attachment location. The maximum feed force Ff was determined in the experiments. The accuracy of drilled holes was estimated by optical microscopy. Diameters of the drilled holes were measured. Results made it possible to determine the recommended unsupported element length at which the hole dimensions were within the dimensional tolerance. The study showed a clear decrease in the drilled hole quality and a significant increase in the feed force, especially in the area of tool exit from the workpiece. In addition, the number of delaminated fibers increased with unsupported element length was determined in the study.