Weiterverarbeitungsaspekte und Anwendungsbeispiele

Cherif, Chokri; Diestel, Olaf; Engler, Thomas W.; Hufnagl, Evelin; Weiland, Silvio

doi:10.1007/978-3-642-17992-1_16

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…Notably, more fiber damage might have arisen from increased contacts with the rollers [53], whereas more inherent imperfections of the filaments could be bridged by the matrix with better impregnation quality. Hence, improved tensile performance was mainly explained by superior stretching and alignment of the filaments in the bundle [54] and, with better impregnation quality, by the bridging behavior during deformation. However, the E-moduli of all MCFs ranged between 220 and 230 GPa and seemed to be less affected by the impregnation quality, but rather are predominantly determined by the CF properties themselves.…”

Section: Morphological Characterizationmentioning

confidence: 99%

Influence of Roller Configuration on the Fiber–Matrix Distribution and Mechanical Properties of Continuously Produced, Mineral-Impregnated Carbon Fibers (MCFs)

Liebscher

Zhao

Wilms

et al. 2022

Fibers

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The article at hand is envisaged to enumerate significant technological parameters for the successful impregnation of carbon fiber rovings having 50,000 (50 K) filaments, each within a fine-grained, cementitious suspension. Parameters such as the number of rollers as well as the influence of roller deflection and rotation have been investigated and discussed with regard to the quality of the related impregnation and mechanical properties resulting therefrom. Morphological analysis disclosed distinct differences in the fiber matrix distribution, which are particularly reflected in the flexural performance of the mineral-impregnated carbon fibers (MCFs) produced. Moreover, with the best fiber matrix distribution, uniaxial tensile tests on MCFs demonstrated superior tensile strengths, moduli of elasticity, and elongations at rupture.

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Section: Morphological Characterizationmentioning

confidence: 99%

Influence of Roller Configuration on the Fiber–Matrix Distribution and Mechanical Properties of Continuously Produced, Mineral-Impregnated Carbon Fibers (MCFs)

Liebscher

Zhao

Wilms

et al. 2022

Fibers

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“…Due to the different binder and matrix materials used comparative analysis of the given literature is difficult. Therefore, an integral research presented in [14] demonstrated the effect of different binder systems on the complete process chain. It can be concluded that selection of every binder system has a complex interaction with all subsequent process steps and influences numerous mechanical properties which cannot be generalized.…”

Section: Literature Review and Current Shortcomingsmentioning

confidence: 99%

Isothermal Multisection Tooling for the Automated Preforming of Carbon Fiber Composite Structures

Nezami

Gereke

Cherif

2014

KEM

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In order to decrease CO2 emissions caused by individual transport, fibre-reinforced composite materials are used to reduce vehicle weight and thus fuel consumption. Low productivity of current processes complicates the introduction of fibre-reinforced materials to high volume series, where weight reduction would have a large impact. This paper presents an experimental preforming environment designed to take into account diverse process requirements of different binder systems and a new tooling concept. By setting different temperature levels on the moulds in areas where the material is drawn in under the blank holders and inside the cavity, prebonding of the fabric plies can be avoided and quality of the preforms is improved. Moreover, cycle time can be reduced as no heating or cooling of the tools is necessary.

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“…The force transmission mechanisms in TRC are mainly based on the adhesive bond between the yarn's surface and the cementitious matrix and on interactions between individual filaments (activation of core fibers) 22,23 . Many factors, including processing, sewing, and transverse yarns, yarn type, type and degree of impregnation, additional coating, and textile corrugation, have an effect on the bond properties 24–26 .…”

Section: Introductionmentioning

confidence: 99%

Loop‐shaped elements for anchoring carbon reinforcement in concrete

Speck

Rittner

Bracklow

et al. 2020

Civil Engineering Design

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Carbon reinforcements enjoy increasing popularity both in building reinforcement and in new construction. The use of yarns with more than 50 000 filaments per roving and finenesses of up to 3300 tex, so-called heavy tows, enables greater permissible stress and thus increases the performance of the textile reinforced concrete structures. However, high yarn tensile forces with an almost constant roving surface lead to an extension of the required end anchorage and overlap areas. In the project, it was investigated whether a modified loop-shaped yarn arrangement at the selvages could guarantee force transmission over shorter lengths and thus enables a more economic design of this type of construction. This paper presents the results generated within the investigations, proving the potential of the applied method. Manufacturing possibilities, force transmission mechanisms, material properties, and failure mechanisms were analyzed. K E Y W O R D S anchorage length, carbon fiber heavy tows, carbon reinforcement, overlapping length, textilereinforced concrete 1 | INTRODUCTION Carbon, a relatively new nonmetallic reinforcement material, is currently gaining increasing acceptance in the construction industry. Layered fabric structures have established themselves as textile reinforcement materials for new buildings, but especially for the strengthening of existing structures. Since the first General Building Approval in Germany was granted in 2014, 1-3 the use of textiles for the strengthening of steel-reinforced concrete has increased. The application of textile reinforcement has thus become more userfriendly and will be extended by future building approvals. Detailed information on the application of textile-reinforced concrete (TRC), corresponding material tests, and dimensioning concepts can be found for example, in References (4-8). Yarns with higher fineness can improve the economic and structural performance of textile reinforcements. At the beginning of the research on TRC, yarns with less than 1000 fibers were often used. Yarns with finenesses from 3200 to 3600 tex and thus larger crosssections, so-called Carbon Fiber Heavy Tows (CFHT), enable higher tensile strengths for each reinforcement layer. A single layer of today's CFHT fabric can replace several layers of earlier variants of textile reinforcement with low fineness. This makes handling on site more efficient and significantly reduces production costs. 9 CFHT have been investigated in basic research projects 10-14 and were used in initial practical applications. 15-20 However, the use of CFHT is limited by its bond properties. An increase in the quantity of filaments leads on the one hand to an increase in the yarn's tensile capacity. On the other hand, the ratio

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Weiterverarbeitungsaspekte und Anwendungsbeispiele

Cited by 8 publications

References 12 publications

Influence of Roller Configuration on the Fiber–Matrix Distribution and Mechanical Properties of Continuously Produced, Mineral-Impregnated Carbon Fibers (MCFs)

Influence of Roller Configuration on the Fiber–Matrix Distribution and Mechanical Properties of Continuously Produced, Mineral-Impregnated Carbon Fibers (MCFs)

Isothermal Multisection Tooling for the Automated Preforming of Carbon Fiber Composite Structures

Loop‐shaped elements for anchoring carbon reinforcement in concrete

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