Preliminary investigation of drilling thick carbon fibre reinforced polymer composite (CFRP)

Sobri, Sharizal Ahmad; Heinemann, Robert; Whitehead, David; Shuaib, N. A.

doi:10.1063/1.5066655

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…Spiral trepanning was capable of cutting different diameter sizes, and this indicated that the larger the diameter required, the wider the HAZ would be. This result also occurred in the work of Sobri et al [ 11 ]. In addition, double-side laser pre-drilled holes were still at the top of the chart.…”

Section: Resultssupporting

confidence: 84%

“…Experimental studies used a combination laser and mechanical technique creating 8 and 10 mm holes in 25.4 mm thick CFRP. All parameters in Tables 2 and 3 were identified based on the standard parameters obtained from previous research attempts [3][4][5][6][7][8][9][10][11][12][13][15][16][17][18][19][20][21][22][23] and modified to fit the current scenario based on machine and equipment capability. In this process, pilot holes were started with a 1 kW IPG fibre laser.…”

Section: Methodsmentioning

confidence: 99%

“…Experimentally, laser power and cutting speed were found to be the most important parameters that influence surface roughness [ 11 ]. In addition, the most important parameters are kerf width, laser power, scanning speed, gas pressure, and duty cycle, while the taper angle has the same factors as the kerf width but with an additional consideration for pulse frequency [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Sequential Laser–Mechanical Drilling of Thick Carbon Fibre Reinforced Polymer Composites (CFRP) for Industrial Applications

2021

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Carbon fibre reinforced polymer composites (CFRPs) can be costly to manufacture, but they are typically used anywhere a high strength-to-weight ratio and a high steadiness (rigidity) are needed in many industrial applications, particularly in aerospace. Drilling composites with a laser tends to be a feasible method since one of the composite phases is often in the form of a polymer, and polymers in general have a very high absorption coefficient for infrared radiation. The feasibility of sequential laser–mechanical drilling for a thick CFRP is discussed in this article. A 1 kW fibre laser was chosen as a pre-drilling instrument (or initial stage), and mechanical drilling was the final step. The sequential drilling method dropped the overall thrust and torque by an average of 61%, which greatly increased the productivity and reduced the mechanical stress on the cutting tool while also increasing the lifespan of the bit. The sequential drilling (i.e., laser 8 mm and mechanical 8 mm) for both drill bits (i.e., 2- and 3-flute uncoated tungsten carbide) and the laser pre-drilling techniques has demonstrated the highest delamination factor (SFDSR) ratios. A new laser–mechanical sequence drilling technique is thus established, assessed, and tested when thick CFRP composites are drilled.

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Section: Resultssupporting

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sequential Laser–Mechanical Drilling of Thick Carbon Fibre Reinforced Polymer Composites (CFRP) for Industrial Applications

2021

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“…This investigation was applied to the spiral trepanning strategy based on the preliminary results by Sobri et al [ 16 ] in single pass cutting, due to the positive results achieved in terms of significant material removal rate, and the significant reduction of HAZ and other defects. It is assumed that changing the FPP varies the laser energy level in the machining of CFRP and that this alteration determines the laser beam’s spot size on the surface.…”

Section: Methodsmentioning

confidence: 99%

Development of Laser Drilling Strategy for Thick Carbon Fibre Reinforced Polymer Composites (CFRP)

2020

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Composites from carbon fibre reinforced polymers (CFRPs) play a significant role in modern manufacturing. They are typically used in aerospace and other industries that require high strength-to-weight ratios. Composite machining, however, remains a challenging job and sometimes is hampered by poor efficiency. Despite considerable research being conducted over the past few years on the machining of composite materials, the material nevertheless suffers from delamination, fibre loss, and imperfect finishing of the fuselage. Laser technology is becoming increasingly popular as an alternative approach to cutting and drilling composites. Experiments have been conducted with a CFRP thickness of 25.4 mm using fibre laser to test the effect of the machining parameters on the primary performance measurements. In this study, different machining criteria are used to assess the fibre laser ability of thick CFRP composites for drilling operation. The experimental findings revealed that a fibre laser is capable of penetrating a thick CFRP to a depth of 22 mm by using a novel drilling procedure.

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“…The essence of this scenario is the optimisation of the peeling force, which plays an intermediate role. In practice, the thrust force and torque were the components for the peeling force, and this was proven in the recent experiments by Sobri [ 19 ]. This is significant because they are linked to the onset of delamination.…”

Section: Resultsmentioning

confidence: 99%

Augmentation of the Delamination Factor in Drilling of Carbon Fibre-Reinforced Polymer Composites (CFRP)

et al. 2020

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Carbon fibre-reinforced polymer (CFRP) composite materials play an increasingly important role in modern manufacturing, and they are among the more prominent materials used in aircraft manufacturing today. However, CFRP is highly prone to delamination and other damage when drilled due to it being extremely strong with a good strength-to-weight ratio and high thermal conductivity. Because of this problem and CFRP’s growing importance in aircraft manufacture, research has focused on the entry and exit holes as indicators of damage occurrence during drilling of screws, rivets, and other types of holes. The inside of the hole was neglected in past research and a proper way to quantify the internal side of a hole by combining the entry and exit hole should be included. To fill this gap and improve the use of CFRP, this paper reports a novel technique to measure the holes by using the extension of the adjusted delamination factor (SFDSR) for drilling thick CFRP composites in order to establish the influence of machining input variables on key output measures, i.e., delamination and other damages. The experimental results showed a significant difference in interpretation of the damage during the analysis. Improvement was made by providing better perspectives of identifying hole defects.

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Preliminary investigation of drilling thick carbon fibre reinforced polymer composite (CFRP)

Cited by 6 publications

References 11 publications

Sequential Laser–Mechanical Drilling of Thick Carbon Fibre Reinforced Polymer Composites (CFRP) for Industrial Applications

Sequential Laser–Mechanical Drilling of Thick Carbon Fibre Reinforced Polymer Composites (CFRP) for Industrial Applications

Development of Laser Drilling Strategy for Thick Carbon Fibre Reinforced Polymer Composites (CFRP)

Augmentation of the Delamination Factor in Drilling of Carbon Fibre-Reinforced Polymer Composites (CFRP)

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