Experimental assessment of delamination extension on carbon / epoxy drilled plates

Devesa, L.; Matos, João E.; Durão, Luís Miguel P.

doi:10.1016/j.jcomc.2021.100144

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…This case can be explained by the high delamination potential of this kind of drill tool. Similar observations were also reported in the literature [ 58 ] while the delamination risk of the brad-type drill was noted.…”

Section: Resultssupporting

confidence: 90%

Effect of Drilling Parameters and Tool Geometry on the Thrust Force and Surface Roughness of Aerospace Grade Laminate Composites

et al. 2023

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Carbon fiber-reinforced plastics (CFRPs) have been specially developed to enhance the performance of commercial and military aircraft because of their strength, high stiffness-to-density ratios, and superior physical properties. On the other hand, fasteners and joints of CFRP materials may be weak due to occurring surface roughness and delamination problems during drilling operations. This study’s aim is to investigate the drilling characterization of CFRPs with different drilling parameters and cutting tools. Drilling tests were performed with the Taguchi orthogonal array design (L18: 2^1 3^3). Tests were conducted with three levels of cutting speed (15, 30, 45 m/min), three levels of feed rate (0.05, 0.1, 0.2 mm/rev), two levels of drill diameter (3 and 5 mm), and three different types of drills (two twist drills with a point angle of 138° and 120° and one brad drill). Thrust forces were recorded during drilling tests, and afterwards surface roughness and hole delamination were measured. Obtained results were analyzed with Taguchi and two-way ANOVA. The general tendency was that low cutting speed, high feed rate, and small diameter drill caused an increase in thrust force. Surface roughness decreases with increasing tool diameter, decreasing feed, and cutting speed. Delamination factors of the samples dropped depending on decreasing thrust force levels. Remarkably, it is possible to control the delamination factor values via better surface quality. The brad drill and larger point angle have a negative effect on the drilling quality of CFRPs. According to all results, the cutting speed of 45 m/min and feed rate of 0.05 mm/rev using a type II drill having a 120° point angle and 5 mm diameter (12th trial) and the cutting speed of 30 m/min and feed rate of 0.05 mm/rev using a type II drill having a 120° point angle and 3 mm diameter (2nd trial) were determined as optimum drilling conditions.

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Section: Resultssupporting

confidence: 90%

Effect of Drilling Parameters and Tool Geometry on the Thrust Force and Surface Roughness of Aerospace Grade Laminate Composites

et al. 2023

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“…Durão et al [24] used damage assessment image-based methods through computational processing of data extracted from radiographic images and compared them with mechanical test results, bearing and delamination assessment tests, and analytical models, obtaining valuable information regarding the delamination extension and mechanical strength of the drilled parts. In more recent studies, Durão et al [25] and Devesa et al [26] used similar methods to calculate the fractal dimension of the damaged region's boundary. Geier et al [27] predicted drilling-induced burr occurrence in CFRP composites using image processing and analysis by studying the fibre orientation in CFRP sections and their local properties, achieving an accuracy of 64-97% compared to real drilling experiments.…”

Section: Introductionmentioning

confidence: 99%

Image Analysis Techniques Applied in the Drilling of a Carbon Fibre Reinforced Polymer and Aluminium Multi-Material to Assess the Delamination Damage

Sousa Costa,

Barbosa,

Silva

et al. 2024

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Due to the high abrasiveness and anisotropic nature of composites, along with the need to machine different materials at the same time, drilling multi-materials is a difficult task, and usually results in material damage, such as uncut fibres and delamination, hindering hole functionality and reliability. Image processing and analysis algorithms can be developed to effectively assess such damage, allowing for the calculation of delamination factors essential to the quality control of hole inspection in composite materials. In this study, a digital image processing and analysis algorithm was developed in Python to perform the delamination evaluation of drilled holes on a carbon fibre reinforced polymer (CFRP) and aluminium (Al) multi-material. This algorithm was designed to overcome several limitations often found in other algorithms developed with similar purposes, which frequently lead to user mistakes and incorrect results. The new algorithm is easy to use and, without requiring manual pre-editing of the input images, is fully automatic, provides more complete and reliable results (such as the delamination factor), and is a free-of-charge software. For example, the delamination factors of two drilled holes were calculated using the new algorithm and one previously developed in Matlab. Using the previous Matlab algorithm, the delamination factors of the two holes were 1.380 and 2.563, respectively, and using the new Python algorithm, the results were equal to 3.957 and 3.383, respectively. The Python results were more trustworthy, as the first hole had a higher delamination area, so its factor should be higher than that of the second one.

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Evaluation of Surface Delamination in Drilled Fiber-Reinforced Polymer Composites Using Digital Image Processing

Mohan¹,

Kumar

Sachit

et al. 2023

J. Inst. Eng. India Ser. D

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Experimental assessment of delamination extension on carbon / epoxy drilled plates

Cited by 3 publications

References 26 publications

Effect of Drilling Parameters and Tool Geometry on the Thrust Force and Surface Roughness of Aerospace Grade Laminate Composites

Effect of Drilling Parameters and Tool Geometry on the Thrust Force and Surface Roughness of Aerospace Grade Laminate Composites

Image Analysis Techniques Applied in the Drilling of a Carbon Fibre Reinforced Polymer and Aluminium Multi-Material to Assess the Delamination Damage

Evaluation of Surface Delamination in Drilled Fiber-Reinforced Polymer Composites Using Digital Image Processing

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