Hybride Bearbeitungsverfahren für CFK und artverwandte Faserverbundkunststoffe

Hintze, Wolfgang

doi:10.1007/978-3-662-63265-9_11

Cited by 2 publications

(11 citation statements)

References 3 publications

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“…The matrix is also used to initiate and transfer applied load into the reinforcing fibers and as a general protection against environmental influences [1,2,6]. The properties of such composites can be individually adapted to the respective application by selecting the matrix material and the fibers according to volume fraction, length, orientation and overall layer structure [1,7]. If required, the fiber and matrix laminates can be supplemented by fillers, additives and inlays or cover layers [8].…”

Section: Cfrp Composite-layout and Manufacturingmentioning

confidence: 99%

“…If required, the fiber and matrix laminates can be supplemented by fillers, additives and inlays or cover layers [8]. The latter are used, for example, to prevent electrochemical corrosion in metallic contact areas (glass fiber sheets) or for electrical shielding and lightning protection (copper mesh) [2,7].…”

Section: Cfrp Composite-layout and Manufacturingmentioning

confidence: 99%

“…Therefore, subsequent machining is indispensable in any case. This includes, for example, edge trimming, milling of cutouts and drilling [1,[6][7][8]. As subsequent machining in the aerospace industry takes place at a late stage in the value chain, high-quality and reliable processes are essential [11,12].…”

Section: Subsequent Machining Of Cfrp Componentsmentioning

confidence: 99%

“…Incident radiation on the surface of the workpiece is absorbed, reflected and transmitted proportionally [7,53], with the following relationship between the wavelength 𝜆 L dependend absorption coefficient 𝐴 WS (𝜆 L ), reflection coefficient 𝑅 WS (𝜆 L ) and transmission coefficient 𝑇 WS (𝜆 L ):…”

Section: Optical Properties Of Cfrp Epoxy and Carbon Fibersmentioning

confidence: 99%

“…The absorption coefficient α WS.opt (𝜆 L ) describes the intensity decrease per unit length according to Lambert-Beer's law and gives as reciprocal the absorption length 𝑙 opt.WS-1 , i.e. the optical penetration depth at which the intensity has decreased to 1/𝑒 times the fraction of its initial value [7,54]. Depending on the component or layer thickness, this value provides information on the extent to which the laser radiation is absorbed or transmitted.…”

Section: Optical Properties Of Cfrp Epoxy and Carbon Fibersmentioning

confidence: 99%

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Sensor-guided machining of large-scale CFRP components based on resin transfer molded features

Muth,

Carstensen,

Hintze

et al. 2023

Optical Measurement Systems for Industrial Inspection XIII

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Carbon fiber-reinforced Plastics (CFRP) are a key factor for achieving a carbon-neutral mobility sector due to their lightweight properties. Despite their near-net-shape manufacturing subsequent precision machining is required. In case of large-scale CFRP components, which are characterized by small quantities and low machining volumes, such processes are difficult to operate economically with conventional systems. Robotic systems offer a suitable solution. Their use in machining, however, requires additional measures to compensate for structural system limitations. In addition, individual deviations of the blanks require time-consuming measuring for referencing the machining system.To enable the use of cost-efficient robotic systems and to eliminate unproductive downtime for measuring, the intended manufacturing of CFRP components by Resin Transfer Molding (RTM) offers a new opportunity. RTM allows for the integration of defined features into the molding tool, which are reproduced inverted on the component and can be referenced by subsequent processes. This is utilized with adapted strategies for time-efficient measuring and high-precision machining.Fundamentals for the corresponding feature design as well as the selection of a suitable measuring device are presented. Focusing on laser-based sensors, the relationship between wavelength and (semi-)transparent surfaces is discussed and validated. Besides the metrological detection, production-specific aspects are also taken into account. Based on the gained knowledge, the main aspects of a proper sensor-feature combination are elaborated and prototypically realized. Finally, an outlook is provided on the challenges involved when implementing a robust algorithm for feature detection.

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Section: Cfrp Composite-layout and Manufacturingmentioning

confidence: 99%

Section: Cfrp Composite-layout and Manufacturingmentioning

confidence: 99%

Section: Subsequent Machining Of Cfrp Componentsmentioning

confidence: 99%

Section: Optical Properties Of Cfrp Epoxy and Carbon Fibersmentioning

confidence: 99%

Section: Optical Properties Of Cfrp Epoxy and Carbon Fibersmentioning

confidence: 99%

See 3 more Smart Citations

Sensor-guided machining of large-scale CFRP components based on resin transfer molded features

Muth,

Carstensen,

Hintze

et al. 2023

Optical Measurement Systems for Industrial Inspection XIII

View full text Add to dashboard Cite

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Aviation in Transition: On the Necessity of Recycling Highly Stressed Primary Structures Post End-of-Life and Appropriate Disassembly Technologies - Part 02 - Mathematical Considerations of the Separation Process

Kreikemeier,

Schwieger

2024

Preprint

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In the current effort towards sustainability, the aviation industry faces challenges in repurposing carbon fiber reinforced plastic (CFRP) components effectively. Traditional "downcycling" methods fail to maintain CFRP integrity, as they involve cutting load-bearing fibers and re-embedding them with new polymers, which leads to fragmentation and loss of properties. Innovative solutions like non-destructive disassembly or dismanteling offer precise separation without compromising fiber integrity. This method allows for the direct reuse of materials in similar or new applications and highlights the importance of advanced recycling technologies for fiber-reinforced plastics. Finite element method (FEM) analysis shows the basic separation mechanism functions without damaging the base material in simulated shell structures. Safety margins are within acceptable ranges, and additional damping forces enhance process safety. Thinner wedges are recommended as they generate lower loads, exhibit less dependency on plate stiffness, and require shorter crack lengths. Fracture risk is influenced by specific parameters. Critical parameters must be determined during structure development, as they cannot be varied in existing components without design considerations for recyclability. However, green inputs can be directly modified to improve the process. Targeted force applications, such as pressing at the crack tip and relieving force at the wedge contact point, reduce structural load. A cable force mechanism, supported by a lateral roller, effectively relieves wedge contact force. In summary, the wedge separation process is suitable for non-destructive disassembly of stiffeners, representing a promising approach for developing practical test stands.

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Hybride Bearbeitungsverfahren für CFK und artverwandte Faserverbundkunststoffe

Cited by 2 publications

References 3 publications

Sensor-guided machining of large-scale CFRP components based on resin transfer molded features

Sensor-guided machining of large-scale CFRP components based on resin transfer molded features

Aviation in Transition: On the Necessity of Recycling Highly Stressed Primary Structures Post End-of-Life and Appropriate Disassembly Technologies - Part 02 - Mathematical Considerations of the Separation Process

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