scholarly journals Development of a new hybrid yarn construction from recycled carbon fibres for high-performance composites: Part IV: Measurement of recycled carbon fibre length

2020 ◽  
Vol 15 ◽  
pp. 155892502091072
Author(s):  
Martin Hengstermann ◽  
Karl Kopelmann ◽  
Andreas Nocke ◽  
Anwar Abdkader ◽  
Chokri Cherif
Keyword(s):  
Carbon Fibre ◽  
High Performance ◽  
Fibre Length ◽  
Reference Method ◽  
Single Fibre ◽  
Measuring System ◽  
Carbon Fibres ◽  
Reinforced Plastics ◽  
Hybrid Yarn ◽  
Reference Length

Due to the increasing application of carbon fibre–reinforced plastics, the use of recycled carbon fibres can help reduce the tremendous amount of carbon fibre waste growing worldwide. In this context, the processing of longer recycled carbon fibres (>40 mm mean length) into hybrid yarn constructions offers a promising solution. The characterisation of recycled carbon fibre length is essential for textile processes. However, to suit the atypical fibre characteristics of recycled carbon fibres compared to standard natural or man-made-fibres, the development of an adequate measuring technique is required. Investigations on the state of the art suggest that an adapted fibrograph method might pose an appropriate measuring system. Therefore, new test equipment and an alternative image analysing method based on pixel greyscale values were developed. To enable a calibration process, different samples with cut carbon fibre from carded and drafted slivers were intensively tested and compared. In addition, an adapted reference method was investigated by combining single fibre measurement and image processing techniques. In a final step, recycled carbon fibres samples with unknown fibre length were tested. Results proved that the presented measuring system is adequate for the testing of longer recycled carbon fibres in webs or slivers. All measured values were close to the measured reference length values (deviation ±4%).

Development of a Novel Textile Process for the Production of Highly Oriented Nonwovens Made from Recycled Carbon Fibres

2019 ◽  
Vol 809 ◽  
pp. 527-532
Author(s):  
Michael Petrich ◽  
Christoph Hoffmeister ◽  
Axel Herrmann
Keyword(s):  
Carbon Fibre ◽  
Process Parameters ◽  
Design Of Experiment ◽  
High Performance ◽  
Statistical Design ◽  
Process Window ◽  
Carbon Fibres ◽  
Research Project ◽  
Reinforced Plastics ◽  
Carbon Fibre Reinforced Plastics

Carbon fibre reinforced plastics (CRFP) are high performance materials with an outstanding lightweight potential. Recycling applications for production waste though, are still scarce and not fully established. In the CaroLIn (carbon fibre nonwovens optimised for aircraft interior components) research project a novel aerodynamic textile process is developed, in order to produce highly orientated non-wovens form recycled carbon fibres. In the first stage of the project a laboratory plant for the orientation of fibres has been constructed and implemented. Afterwards a process window has been defined and a number of process parameters identified. The influence of those parameters was then investigated, using the statistical design of experiment (DOE) method.

scholarly journals An Overview of Impregnation Methods for Carbon Fibre Reinforced Thermoplastics

2017 ◽  
Vol 742 ◽  
pp. 473-481 ◽  
Author(s):  
Thomas Köhler ◽  
Tim Röding ◽  
Thomas Gries ◽  
Gunnar Seide
Keyword(s):  
Carbon Fibre ◽  
High Performance ◽  
Fibre Production ◽  
Matrix Composites ◽  
Carbon Fibres ◽  
Reinforced Plastics ◽  
Thermoplastic Matrix ◽  
Economic Production ◽  
The Matrix ◽  
Reinforced Thermoplastics

Carbon fibre reinforced plastics (CFRPs) can be classified according to whether the matrix is a thermoset or a thermoplastic. Thermoset-matrix composites are by tradition far more common, but thermoplastic-matrix composites are gaining in importance. There are several techniques for combining carbon fibres with a thermoplastic-matrix system. The composite’s characteristics as well as its manufacturing costs are dependent on the impregnation technique of the carbon fibre and the textile structure respectively. Carbon fibre reinforced thermoplastics (CFRTPs) are suitable for fast and economic production of high-performance components. Despite the higher material costs thermoplastic-matrix systems show cost benefits in comparison to thermoset-matrix due to substantial time savings in the production process. Moreover CFRTPs can be manufactured in large production runs. The commingling of reinforcement fibres with matrix fibres is a well-established process. Another approach is the coating of the carbon fibre with a thermoplastic subsequent to the carbon fibre production (carbonization, activation and deposition of sizing). The latter point is currently subject of research and is a promising method for further increasing the production speed. This paper presents the different possibilities of impregnating carbon fibres with a thermoplastic matrix. Diverse technologies along the process chain of the CFRTP production will be discussed.

Features of the structure of carbon fibres used as filler for carbon-fibre-reinforced plastics

2010 ◽  
Vol 42 (3) ◽  
pp. 171-174
Author(s):  
E. G. Belyakova ◽  
B. S. Kogan ◽  
V. G. Pushin ◽  
N. V. Nikolaeva
Keyword(s):  
Carbon Fibre ◽  
Carbon Fibres ◽  
Reinforced Plastics ◽  
Carbon Fibre Reinforced Plastics

scholarly journals A novel approach to functionalise pristine unsized carbon fibre using in situ generated diazonium species to enhance interfacial shear strength

2015 ◽  
Vol 3 (7) ◽  
pp. 3360-3371 ◽  
Author(s):  
L. Servinis ◽  
L. C. Henderson ◽  
L. M. Andrighetto ◽  
M. G. Huson ◽  
T. R. Gengenbach ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Interfacial Shear Strength ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Carbon Fibres ◽  
Novel Approach ◽  
Fibre Composites

An in situ diazonium grafting methodology was used to decorate the surface of carbon fibres with pendant amines. This methodology was shown to greatly affect IFSS in single fibre composites.

scholarly journals Does the Carbon Fibre Coating Reinforcement Have an Influence on the Bearing Capacity of High-Performance Self-Compacting Fibre-Reinforced Concrete?

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4054
Author(s):  
Krzysztof Ostrowski
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
High Performance ◽  
Concrete Structures ◽  
Concrete Mixture ◽  
Cement Matrix ◽  
Plastic Behavior ◽  
Fibre Reinforced Concrete ◽  
Carbon Fibres ◽  
The Impact

This study investigated the impact of the location of a carbon fibre coated reinforcement ring (CFCRr) inside the structure of high-performance self-compacting fibre-reinforced concrete (HPSCFRC). Nowadays, cement matrix is considered as an alternative binder when reinforcing concrete structures with composite materials. Due to the plastic behavior of composite structures at relatively low temperatures when carbon fibres are reinforced with epoxy resin, the author attempted to locate carbon fibres inside a concrete structure. Thanks to this, the reinforcement will be less vulnerable to high temperatures (during a fire) and more compatible with concrete. The fibres act as a perimeter reinforcement that is compatible with the concrete mixture. The position of the CFCRr in the structure of concrete has an influence on the load capacity, stiffness and stress-strain behavior of concrete elements. The research was conducted on circular shape short concrete columns and tested under axial compression. The results demonstrated that by including CFCRr inside a concrete specimen, the maximum compressive strength decreases with an increase in the number of composite rings and a greater distance from the vertical axis of symmetry to the edge of the element. It has been proven in these studies that carbon fibres do not have good adhesive properties between CFCRr and a concrete mixture. As a result of this phenomenon, a shear surface is created, which leads to crack propagation along the CFCRr. Therefore, the presented idea of an internal CFCRr should not be used when designing new concrete structures.

Development of Nonwoven Preforms Made of Pure Recycled Carbon Fibres (rCF) for Applications of Composite Materials

2017 ◽  
Vol 742 ◽  
pp. 555-561 ◽  
Author(s):  
Marcel Hofmann ◽  
Dirk Wenzel ◽  
Bernd Gulich ◽  
Heike Illing-Günther ◽  
Daisy Nestler
Keyword(s):  
Carbon Fibre ◽  
Woven Fabric ◽  
Fibre Material ◽  
Carbon Fibres ◽  
Carbon Fibre Material ◽  
Textile Processing ◽  
Reinforced Plastics ◽  
Laser Systems ◽  
Sewing Threads ◽  
Fabric Production

For the development of an efficient and economic recycling process of carbon fibers (CF) still many technological challenges have to be mastered. One of them is the removal of all extraneous natural and synthetic fibres, e.g. polyester sewing threads. The objective of the research was to develop an in-line process for the removal of those extraneous fibres, which result from mechanical processes such as tearing. A promising approach for the removal of extraneous fibres from cut-off carbon-fibre material (CF) has been identified, getting recycled carbon fibres (rCF). For that purpose, the use of modern laser technologies is particularly promising. However, the focus was not the development of new laser systems, but the adaptation of existing technologies and their integration into textile processing steps for carbon fibre recycling. In addition to the removal of the extraneous fibres, the degree of CF losses and quality degradation due to fibre damage have been analysed and compared with optimum fibre characteristics. The separation has been experimented and corresponding laser parameters have been defined. Finally, the obtained carbon-fibre material has been tested with regard to its processability in textile manufacturing processes (dry non-woven fabric production) up to carbon fibre reinforced plastics (CFRP). For the evaluation of the material for potential applications, test plates from irradiated and non-irradiated material have been used. The performed tensile and flexural tests have proved that the irradiated material has similar properties compared to the non-exposed one.

scholarly journals Mechanical Characterization of Carbon Fibres Recycled by Steam Thermolysis: A Statistical Approach

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
M. Boulanghien ◽  
M. R’Mili ◽  
G. Bernhart ◽  
F. Berthet ◽  
Y. Soudais
Keyword(s):  
Carbon Fibre ◽  
Mechanical Response ◽  
Tensile Tests ◽  
Single Fibre ◽  
Resin Matrix ◽  
Fibre Strength ◽  
Carbon Fibres ◽  
Statistical Parameters ◽  
Residual Properties ◽  
Steam Thermolysis

The recent development of technologies for recycling carbon fibre reinforced plastics (CFRPs) leads to the need to evaluate the mechanical response of recycled carbon fibres. As these fibres are likely to be degraded during the recycling treatment, it is very important to determine their tensile residual properties so as to evaluate their ability as reinforcement for new composite materials. Carbon fibres reclaimed by a steam-thermal treatment applied to degrade the epoxy resin matrix of a CFRP are here analysed. Two conditions were chosen so as to reach two degradation efficiency levels of the steam thermolysis. Several carbon fibre samples were selected for mechanical testing carried out either on single filaments using single fibre tensile tests or on fibre tows using bundle tensile tests. It is shown that the single fibre tensile test leads to a wide variability of statistical parameters derived from the analysis. Bundle tensile tests results were able to indicate that fibre strength of recycled carbon fibre is similar to corresponding as-received carbon fibres thanks to a statistically relevant database. Wide number of tested filaments enabled indeed to obtain low scatters.

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