New tool for reduction of harmful particulate dispersion and to improve machining quality when trimming carbon/epoxy composites

Nguyen-Dinh, Ngoc; Hejjaji, Akshay; Zitoune, Rédouane; Bouvet, Christophe; Salem, Mehdi

doi:10.1016/j.compositesa.2020.105806

Cited by 30 publications

(21 citation statements)

References 20 publications

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“…All materials have been edge trimmed using a full slot up/conventional milling procedure with a diamond coated burr style tool (OSG Corporation, UK). Nguyen-Dinh et al 12 show that increased radial depth of cut increases the surface damage and depth of damage, and the use of full slotting is likely to provide high levels of damage. The DIA-BNC tool is a fine nicked router designed for CFRP trimming with the nick and flute form designed to eliminate uncut fibres and delamination.…”

Section: Verification Of Methodsmentioning

confidence: 99%

Epifluorescent microscopy of edge-trimmed carbon fibre-reinforced polymers: An alternative to computed tomography scanning

Ashworth

Fairclough

Monoranu

et al. 2020

Advanced Composites Letters

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X-Ray computed tomography (XCT) can be used to detect edge-milled carbon fibre-reinforced polymer (CFRP) defects. Significantly this method is able to show subsurface defects that cannot be captured by traditional methods such as stylus-based or more novel areal methods of surface quality measurement. While useful, this method can be prohibitive due to high equipment cost, scanning time and image resolution. XCT can often produce artefacts which falsely predict damage or obscure damage and depending on machine X-ray power often cannot resolve damage to fibre diameter which is critical when observing milled quality of the surface/subsurface. This study utilises epifluorescent (EF) optical microscopy to provide high-quality optical images as an alternative to XCT to observe through-depth damage of CFRP materials. The method of computing the novel damage criteria is presented, as well as the validation of the method which compares EF to XCT. Subsurface damage of fabric and unidirectional (UD) materials in 0°, 45°, 90° and −45° orientations to the cutting edge is observed to demonstrate typical defects. A novel metric resulting from the EF method provides a total area of damage when compared to a theoretically straight cut across the face of the edge-milled CFRP. The method shows that different subsurface damage exists for different fibre orientations to the cutting edge, highlighting the clear need for through-depth analysis of machined edges. In addition, the method is shown to be a suitable alternative to XCT with scope for further development of industrial aerospace and automotive quality control of machined CFRP parts.

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Section: Verification Of Methodsmentioning

confidence: 99%

Epifluorescent microscopy of edge-trimmed carbon fibre-reinforced polymers: An alternative to computed tomography scanning

Ashworth

Fairclough

Monoranu

et al. 2020

Advanced Composites Letters

View full text Add to dashboard Cite

show abstract

“…The test results indicate that the trimming with a mixture of lower cutting speed and higher feed speed can reduce the harmful effects. 17 It has been noted that machine extension does not directly correspond to specimen strain. However, there is a correlation between them.…”

Section: Mechanical Testing On Edge Treated Compositesmentioning

confidence: 99%

“…The results indicate that the trimming with a mixture of lower cutting speed and higher feed speed can reduce the harmful effects. 17 A new study indicated that the cutting force and sub-surface damage were increased with increasing fiber orientations. 18 At the same time, the rake angle had no or minimal effects on the cutting forces and the observed damage.…”

Section: Introductionmentioning

confidence: 99%

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Mitigations of machine-damaged free-edge effects on fiber-reinforced composites

Brauning

Arifa

Alarifi

et al. 2020

Journal of Composite Materials

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The carbon fiber-reinforced composites were prepared in a vacuum oven using pre-preg composites, and the edge surfaces of the composite coupons were treated using high performing adhesives to eliminate the free-edge effects. The primary objective of the study was to usefully address the free-edge effects of composites used in aircraft and other manufacturing industries. The mechanical test results conducted on the untreated and edge-treated test coupons showed that the edge treatment and fiber orientations significantly affected the tensile strength and quality of the composites. It is determined that applying adhesives on the edges of the coupons could improve the mechanical properties of the composites, about 11%. Successful testing and evaluation of materials can lead to the precise analysis of a structure, and predictable behavior of the end design. This study may open up new possibilities to enhance the overall mechanical properties of fiber-reinforced composites for various manufacturing industries.

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“…Among the variety of cutting tools used in machining of composites are: high-speed steel (HSS), tungsten carbide, cubic boron nitride (cBN) and polycrystalline diamond (PCD). In the case of composites, apart from the tool material itself, the processing parameters are also very important [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Types of Cemented Carbide Blades and Coating Thickness on Structure and Properties of TiN/AlTiN and TiAlN/a-C:N Coatings Deposited by PVD Techniques for Machining of Wood-Based Materials

et al. 2021

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The influence of different types of cemented carbide blades and thickness of TiAlN/a-C:N and TiN/AlTiN protective coatings used in the wood industry on cutting performance has been studied. Three types of WC-Co cemented carbide blades with different cobalt content were used in the study. The thicknesses of both types of coatings were ~2 and ~5 µm. The structure, chemical and phase composition were studied using transmission and scanning electron microscopy (TEM, SEM), X-ray dispersion spectroscopy (EDX) and X-ray diffraction (XRD), respectively. The adhesion was evaluated by scratch test. Nanohardness and durability tests of uncoated and coated blades were performed. We found that the blades covered with 5 µm TiN/AlTiN coatings exhibited the best durability characteristic. The cutting distances were within the range ~6700-~7080 depending on the substrates in comparison with pure substrates (~4300–~4900) and 2 µm TiN/AlTiN coatings (~5400–~6600). The presence of a thin and soft outer a-C:N layer aggravates the nanohardness and durability of the coated blades.

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New tool for reduction of harmful particulate dispersion and to improve machining quality when trimming carbon/epoxy composites

Cited by 30 publications

References 20 publications

Epifluorescent microscopy of edge-trimmed carbon fibre-reinforced polymers: An alternative to computed tomography scanning

Epifluorescent microscopy of edge-trimmed carbon fibre-reinforced polymers: An alternative to computed tomography scanning

Mitigations of machine-damaged free-edge effects on fiber-reinforced composites

Influence of Different Types of Cemented Carbide Blades and Coating Thickness on Structure and Properties of TiN/AlTiN and TiAlN/a-C:N Coatings Deposited by PVD Techniques for Machining of Wood-Based Materials

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