Non-destructive Detection of Drilling-induced Delamination in CFRP and its Effect on Mechanical Properties

Haeger, Andreas; Schoen, Georgeta; Lissek, Fabian; Meinhard, Dieter; Kaufeld, Michael; Schneider, Gerhard; Schuhmacher, Silvia; Knoblauch, Volker

doi:10.1016/j.proeng.2016.06.647

Cited by 46 publications

(27 citation statements)

References 23 publications

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“…Figure 6 shows that the maximum and minimum delamination on the entrance side are for 3000 rpm and 9000 rpm, respectively. The peeling force in the upward direction, which breaks either the single layer of fibers or the entire upper ply, is responsible for the peel-up delamination [54]. However, at a cutting speed of 12,000 rpm, as shown in Figure 6, the entrance side delamination tends to augment slightly as compared to 9000 rpm.…”

Section: Delamination Factor (Fd)mentioning

confidence: 98%

Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Ali

Yue

et al. 2018

JMMP

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Abstract:The drilling of carbon fiber reinforced polymer (CFRP) plate is very critical in its structural applications in aeronautical, aerospace, and automobile industries. For ensuring the good quality of drilled holes in terms of least drilling damage and prolonged tool life, suitable selection of drill geometry and material, and drilling parameters-such as cutting speed and feed rate-are imperative in the drilling of CFRP plate. This study aims to evaluate the cutting performance of conventional two-flute twist drills made of cemented tungsten carbide YG6X (WC-6 wt % Co) for the dry drilling of the multidirectional T700 CFRP plate. The effects of varying cutting speed and tool wear pattern on the drilling performance are analyzed. The drilling performance is assessed in terms of hole quality by the qualitative and quantitative analysis of drilling-induced delamination and hole diameter. Furthermore, the correlation between the tool wear progression and the drilled hole quality is established. Through this assessment, a suitable set of drilling parameters, i.e., cutting speed of 9000 rpm and feed rate of 400 mm/min, is proposed for producing the best quality holes for multidirectional T700 CFRP plate.

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Section: Delamination Factor (Fd)mentioning

confidence: 98%

Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Ali

Yue

et al. 2018

JMMP

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“…A lot of research works identified abrasive wear as the dominant tool wear mechanism in both conventional drilling and high speed drilling of composite laminates due to the highly abrasive nature of the carbon and glass fibres [ 82 , 83 , 84 , 85 ]. As reported by several researchers, tool wear leads in turn to the stronger composite damage during drilling [ 80 , 86 , 87 , 88 , 89 ]. Fernandez-Perez et al studied the influence of the tool wear on the quality of the holes drilled in CFRP composite [ 89 ].…”

Section: Drilling Holesmentioning

confidence: 99%

“…The delamination size in drilled composites can be controlled by the proper selection of drilling parameters, drill geometry, and drill material [ 101 ]. Some authors proved that the feed speed and the thrust force, which depends on the feed speed [ 101 , 105 ], have the highest influence on the delamination magnitude [ 80 , 86 , 101 , 106 , 107 ], while cutting speed is the parameter which has the highest effect on the hole surface quality [ 106 ]. However, other authors did not observe a direct relationship between thrust force and delamination during drilling glass fibre-reinforced composite [ 108 ].…”

Section: Drilling Holesmentioning

confidence: 99%

Mechanical Joining of Fibre Reinforced Polymer Composites to Metals—A Review. Part I: Bolted Joining

Galińska

2020

Polymers

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As the fibre reinforced plastic composites gain larger and larger share in industry, the problem of joining them with metal elements becomes significant. The current paper is the first part of the literature review, which gathers and evaluates knowledge about methods suitable for mechanical joining of composite and metal elements. This paper concerns bolted joining, because this method of mechanical joining is widely used for joining composite materials. The paper describes failure modes of bolted joints in composite materials, the influence of the bolt clamping torque, the clearance between the bolt and the hole and aging on the performance of the joint, drilling techniques used in composite materials in order to minimize damages, different fastener types, inspection techniques, and finally, the techniques that have been developed in order to improve the strength of the bolted joints in composites. Since the hole drilled in a composite material in order to perform bolted joining is a weak point of the structure, those techniques: bonded inserts, titanium foil internal inserts, fibre steering, additional reinforcement, and moulded holes, mainly aim to improve the strength of the hole in the composite. The techniques have been discussed in details and compared with each other in the summary section.

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“…However, it can be concluded based on refs. [51][52][53] that other forms of damage also occur and influence mechanical properties of laminate around the hole. Many papers deal with mechanical joints, especially in a laminate structure [10][11][12][13][14][15][16][17], and conclude that mechanical joints still undergo both the experimental and numerical studies in order to improve their behavior.…”

Section: Introductionmentioning

confidence: 99%

“…However, it can be concluded based on refs. [51][52][53] that other forms of damage also occur and influence mechanical properties of laminate around the hole.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Selected Local Phenomena in CFRP Laminate on Global Characteristics of Bolted Joints

et al. 2019

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High specific mechanical properties of composites are the reason for their use in various fields, e.g., the aerospace industry. Mechanical joints are still used in the aerospace industry to assembly large aircraft structures. The properties of laminate around the hole can be, however, weakened, compared to their nominal values as a result of a drilling process or cyclic loading. This paper aims at the classification and analysis of imperfections affecting mechanically fastened joints in a laminate structure. A method of modeling the hole vicinity, a gradient material model, as well as the numerical and experimental estimation of laminate deterioration in this area, were proposed and analyzed. Comparative analysis of numerical and experimental results based on displacements of the testing machine grip and the extensometer length confirmed the aforementioned results as consistent in linear ranges. Therefore, joint characteristics obtained based upon measurement of the grip displacement and the ratio of stiffness in linear ranges are sufficient to determine the parameters of a gradient material model. Some imperfections resulting from, e.g., asymmetry, were included in the gradient material model; thus, the obtained weakening of laminate properties in the hole vicinity can be overestimated. Therefore, further analyses of the gradient material model for laminate structures are necessary.

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Non-destructive Detection of Drilling-induced Delamination in CFRP and its Effect on Mechanical Properties

Cited by 46 publications

References 23 publications

Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Assessment of Cutting Performance of Cemented Tungsten Carbide Drills in Drilling Multidirectional T700 CFRP Plate

Mechanical Joining of Fibre Reinforced Polymer Composites to Metals—A Review. Part I: Bolted Joining

The Influence of Selected Local Phenomena in CFRP Laminate on Global Characteristics of Bolted Joints

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