Evaluation of bore exit quality for fibre reinforced plastics including delamination and uncut fibres

Voß, Robert; Henerichs, Marcel; Rupp, Sabrina; Kuster, Friedrich; Wegener, Konrad

doi:10.1016/j.cirpj.2015.09.003

Cited by 63 publications

(27 citation statements)

References 34 publications

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“…A majority of studies have focused on drilling of CFRP laminates 4,[16][17][18][19][20][21][22][23] and CFRP/metal [24][25][26][27][28][29][30] stacks including drill-induced damages, drill bit geometry and tool wear. However, studies on milling of CFRP laminates are still quite limited.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on effects of fiber cutting angle in milling of high-strength unidirectional carbon fiber–reinforced polymer laminates

Wang

Wen

Ming

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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It is still a challenge to machine high-strength carbon fiber-reinforced polymer with high quality due to its poor machinability. Fiber direction is the critical factor. This article aims to investigate the effects of fiber cutting angle in milling of high-strength unidirectional carbon fiber-reinforced polymer laminates with regard to milling forces, machined surface morphology and surface roughness. The edge trimming and slot milling tests were conducted. The largest radial and tangential forces were observed on 135°fiber cutting angle followed by 90°while the smallest milling forces were observed on 45°fiber cutting angle. Totally, four basic material fracture mechanisms, that is, fiber-matrix debonding, bendinginduced fiber fracture, shear-induced fiber fracture and compression-induced fiber fracture, were observed by the analysis of fracture morphology for a single fiber. The four basic material fracture mechanisms dominate the material fracture behavior during the cutting of carbon fiber-reinforced polymer. Besides, it is indicated that surface roughness of the machined surfaces is highly related to the type of the surface defects. Surface cavities caused by fiber-matrix debonding and bending-induced fiber fractures on 45°fiber cutting angle were observed to be the main factors leading to the decline of surface finish in milling of carbon fiber-reinforced polymer laminates.

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Section: Introductionmentioning

confidence: 99%

Experimental study on effects of fiber cutting angle in milling of high-strength unidirectional carbon fiber–reinforced polymer laminates

Wang

Wen

Ming

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Hole quality in CFRP/Ti alloy stack is characterized by the following respond values in Ti: Surface roughness [ 1 ], hole diameter, geometrical accuracy (roundness) [ 2 ], burr size [ 3 ]; and in CFRP by delamination factor ( F d ) [ 4 , 5 ], thermal destruction, and the damage value ( Q d ) [ 6 ]. In experimental studies the most often measured physical quantities are thrust force ( F , N) [ 1 , 5 ], torque ( M c , Nmm) [ 1 , 5 ], cutting temperature (T, °C) [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ], chip formation mechanism [ 14 , 15 ], and technical quantities such as flank wear [ 16 , 17 , 18 ] and tool life [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Drilling Temperature, Geometrical Errors and Thermal Expansion of Drill on Hole Accuracy When Drilling CFRP/Ti Alloy Stacks

et al. 2020

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The drilling of holes in CFRP/Ti (Carbon Fiber-Reinforced Plastic/Titanium alloy) alloy stacks is one of the frequently used mechanical operations during the manufacturing of fastening assemblies in temporary civil aircraft. A combination of inhomogeneous behavior and poor machinability of CFRP/Ti alloy stacks in one short drilling brought challenges to the manufacturing community. The impact of the drilling temperature and time delay factor under various cutting conditions on hole accuracy when machining CFRP/Ti alloy stacks is poorly studied. In this paper, the drilling temperature, the phenomenon of thermal expansion of the drill tool, and hole accuracy are investigated. An experimental study was carried out using thermocouples, the coordinate measuring machine method, and finite element analysis. The results showed that the time delay factor varied from 5 (s) to 120 (s), influences the thermal-dependent properties of CFRP, and leads to an increase in hole roundness. Additionally, the thermal expansion of the drill significantly contributes to the deviation of the hole diameter in Ti alloy.

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“…Pecat et al [6], Rajasekaran et al [7], Schorník et al [12], Lissek et al [13] and Wang et al [14] studied the influence of cutting parameters on the surface quality of CFRPs using an experimental approach. Konneh et al [8], Haddad et al [9] and Voß et al [10] investigated machining defects under various tool geometries and cutting parameters. Calzada et al [11] developed a microstructure-based finite element model for CFRP machining to describe the fiber failure mode in the chip formation process.…”

Section: Introductionmentioning

confidence: 99%

“…Surface quality and machining defects play an important role in CFRP milling [9][10][11]. CFRPs are made of carbon fiber layers, and the interlaminar strength is lower than that of the inner layer.…”

Section: Introductionmentioning

confidence: 99%

Surface Quality of Staggered PCD End Mill in Milling of Carbon Fiber Reinforced Plastics

et al. 2017

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Machined surface quality determines the reliability, wear resistance and service life of carbon fiber reinforced plastic (CFRP) workpieces. In this work, the formation mechanism of the surface topography and the machining defects of CFRPs are proposed, and the influence of milling parameters and fiber cutting angles on the surface quality of CFRPs is obtained, which can provide a reference for extended tool life and good surface quality. Trimming and slot milling tests of unidirectional CFRP laminates are performed. The surface roughness of the machined surface is measured, and the influence of milling parameters on the surface roughness is analyzed. A regression model for the surface roughness of CFRP milling is established. A significance test of the regression model is conducted. The machined surface topography of milling CFRP unidirectional laminates with different fiber orientations is analyzed, and the effect of fiber cutting angle on the surface topography of the machined surface is presented by using a digital super depth-of-field microscope and scanning electron microscope (SEM). To study the influence of fiber cutting angle on machining defects, the machined topography under different fiber orientations is analyzed. The slot milling defects and their formation mechanism under different fiber cutting angles are investigated.

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Evaluation of bore exit quality for fibre reinforced plastics including delamination and uncut fibres

Cited by 63 publications

References 34 publications

Experimental study on effects of fiber cutting angle in milling of high-strength unidirectional carbon fiber–reinforced polymer laminates

Experimental study on effects of fiber cutting angle in milling of high-strength unidirectional carbon fiber–reinforced polymer laminates

Experimental Study of Drilling Temperature, Geometrical Errors and Thermal Expansion of Drill on Hole Accuracy When Drilling CFRP/Ti Alloy Stacks

Surface Quality of Staggered PCD End Mill in Milling of Carbon Fiber Reinforced Plastics

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