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Evaluation of Machinability Indicators in Milling of Thin-Walled Composite Structures

Ciecieląg Krzysztof

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 1

202--212

EN

Composite materials are alternative materials to aluminum and titanium alloys. The wide-spread use of this materials makes it necessary to gain insight into the phenomena occurring in machining processes for thin-walled structures. This paper shows the investigation of the machinability of thin-walled composite materials. The study involved milling glass and carbon reinforced plastics using tools dedicated to the processing of this type of material. Their machinability was determined based on the measured feed force, deformation and surface roughness. In addition, surface analysis was performed by SEM. The results showed that the feed had the greatest impact on the feed force, deformation and surface roughness, followed by cutting speed. Lower values of the measured machinability indicators such as the maximum feed force and roughness were obtained for composites with glass fibers. Lower deformations were induced in the machining of composites with carbon fibers. The study also involved conducting a recurrence analysis in order to select the most appropriate quantifications depending on the technological parameters of milling. It was found that the most appropriate indicators related with the technological parameters for both materials were laminarity and averaged diagonal length.

2

Effect of depth surface defects in carbon fibre reinforced composite material on the selected recurrence quantifications

Ciecieląg K., Kęcik K., Zaleski K.

Advances in Materials Science

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2020

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Vol. 20, nr 2(64)

71--80

EN

The paper discusses the problem of possibility of the detecting surface defects in carbon fibre reinforced plastics (CFRP) materials on the basis of the milling time series. First, the special defects in the hole-shaped with various depth were made. Next, the cutting forces are measured during the milling machining. Finally, the recurrence plot and quantification analysis was applied. The obtained results show that the depth defect influences the selected recurrence quantifications, which can be used as the simple defect indicators. The conducted research allow to determine the percentage share of the detectable defects. The novelty of the work and an unresolved problem is the selection of recurrence quantifications with the simultaneous use of them to detect the size of defects in carbon fibre reinforced plastics.

3

Influence of defect diameter on its detection in milling process of composite material using recurrence plot technique

Ciecieląg K., Kęcik K., Zaleski K.

Composites Theory and Practice

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2017

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R. 17, nr 4

194--199

EN

This paper presents the study of the detection of "artificial" defects by nonlinear techniques based on the cutting forces recorded during milling process of composite material. The "artificial" defects are intentionally drilled holes of different diameters made in carbon fiber reinforced plastics. The cutting force was analyzed by recurrence plots and recurrence quantifications analysis. The main purpose of this work is to determine the size of an artificial defect that is possible to detect as well as select the recurrence quantifications for damage detection.

PL

Przedstawiono badania wykrywalności wad „sztucznych” za pomocą nieliniowych technik na podstawie przebiegów sił skrawania zarejestrowanych podczas frezowania materiału kompozytowego. Wadami „sztucznymi” są celowo wywiercone otwory o różnych średnicach w polimerowym materiale kompozytowym wzmocnionym włóknem węglowym. Przebiegi sił poddano analizie za pomocą metody wykresów oraz wskaźników rekurencyjnych. Głównym celem pracy jest ustalenie wielkości sztucznej wady możliwej do wykrycia oraz wyselekcjonowanie wskaźników rekurencyjnych służących do jej detekcji.