Laser machining of Kevlar fiber reinforced laminates – Effect of polyetherimide versus polypropylene matrix

Chouhan, Hemant; Singh, Dilpreet; Parmar, Vinod; Kalyanasundaram, Dinesh; Bhatnagar, Naresh

doi:10.1016/j.compscitech.2016.08.026

Cited by 22 publications

(12 citation statements)

References 22 publications

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“…Mean K and Re measurement results for the holes in AWJ drilling with/without pilot hole for M1 CFRP, M2 CFRP, and M3 CFRP composites with different fiber orientation angles at four different water pressures (3600, 4300, 4800, and 5300 bar), traverse feed rates (750, 1500, 2000, and 3000 mm/min), stand-off distances (1, 2, 3, and 4 mm), and hole diameters (8,10,12, and 14 mm) are presented in Table 4. Based on the experimental results, among all CFRP composites, the highest K (3.337°) was obtained while drilling M2 CFRP without pilot holes, whereas the lowest K (0.870°) was obtained for the M3 CFRP drilling with pilot holes.…”

Section: Experimental Results and Evaluationsmentioning

confidence: 99%

“…After the AWJ drilling operation on the CFRP composites, the K value was calculated using Eq. (8). Top kerf width (W t ) and bottom kerf width (W b ) were magnified 20 × and measured using a Nikon ShuttlePix microscope ( Fig.…”

Section: Kerf Angle Measurementmentioning

confidence: 99%

“…Due to their non-homogeneous structure, composite materials are among the hard-to-machine material types. When machining these kinds of composite materials using traditional machining methods, their anisotropic and heterogeneous structure leads to damage such as cracks in the matrix, fiber pull-out, swelling, and delamination (holesurface damage) [4,[8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of machining parameters for kerf angle and roundness error in abrasive water jet drilling of CFRP composites with different fiber orientation angles

Karataş

Motorcu

Gökkaya

2020

J Braz. Soc. Mech. Sci. Eng.

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In this study, carbon fiber-reinforced polymer (CFRP) composites with three different fiber orientation angles (M1: [0°/90°] s , M2: [+ 45°/− 45°] s , and M3: [0°/45°/90°/− 45°] s) were drilled (with and without pilot holes) on an abrasive water jet (AWJ) machine and the effect of the drilling parameters on the kerf angle (K) and roundness error (Re) of selected holes was investigated to determine quality characteristics. The first aim of the study was the single-objective optimization of drilling parameters for minimum K and Re individually. The second aim was the multi-objective optimization of drilling parameters for the simultaneous minimization of both K and Re. The Taguchi method was applied for single-objective optimization, while all steps of the Taguchi-based gray relational analysis were used for multi-objective optimization. Drilling experiments were performed using the L16 (4 4) orthogonal array. Four levels each for water pressure, stand-off distance, traverse feed rate, and hole diameter were selected as control factors. Analysis of experimental findings revealed that pilot drilling improved the kerf angle of the hole by 12.4% and the roundness error by 22.87%. Minimum kerf angle and roundness error were realized in the AWJ drilling of the M3 CFRP. The most effective parameter on kerf angle and roundness error in AWJ drilling of M1, M2, and M3 CFRP materials was water pressure (80.6%, 76.9%, and 73.8%, respectively), followed by stand-off distance (11.7%, 12.0%, and 13.5%),while other drilling parameters remained below 10%. The statistical evaluation and optimization results in this study can contribute to the evaluation of the AWJ machinability of CFRP composites.

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Section: Experimental Results and Evaluationsmentioning

confidence: 99%

Section: Kerf Angle Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of machining parameters for kerf angle and roundness error in abrasive water jet drilling of CFRP composites with different fiber orientation angles

Karataş

Motorcu

Gökkaya

2020

J Braz. Soc. Mech. Sci. Eng.

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“…Moreover, the mechanical properties of the aramid fibres in the radial direction also substantially affect the surface morphology. Because the strengths of aramid fibres in the transverse direction are dominated by hydrogen bonding, 30 aramid fibres have lower compressive strengths than tensile strengths. Under the action of the relief face of the cutting edge, the fracture surfaces are split and then flattened into compressed extremities.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive investigation of cutting mechanisms and hole quality in dry drilling woven aramid fibre–reinforced plastic with typical tools

Liu

Yang

Liu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part B:

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Due to high specific strength and strong toughness, aramid fibre–reinforced plastics have been widely used in the aircraft, military, and automobile industries. However, in the hole-making process, these excellent properties make aramid fibre–reinforced plastics difficult to machine and prone to severe entrance and exit damages. In this article, the cutting mechanisms of three typical tools (twist drill, burr tool, and brad drill) are thoroughly investigated during dry drilling of aramid fibre–reinforced plastic. On this basis, systematic experiments are conducted to evaluate the cutting performance and hole quality. At the hole entrance, the cutting edges of the twist drill peel and tear the uncut material, which results in severe fuzzing damage. Due to the radial rake angles of the burr tool and brad drill, the radial component of the cutting force can pre-tension aramid fibres prior to being cut, which effectively reduces the fuzzing defect. At the hole exit, the extrusion action of the chisel edge and the severe chip adherence are the main causes of exit damage for the twist drill and burr tool, respectively. Due to the decrease in the thrust force and improvement in the shearing action, the best hole quality is achieved by the brad drill. To further improve the hole quality, an auxiliary approach using collars is introduced to effectively restrain the damage by enhancing interfacial bonding strength. This article provides comprehensive and available information on tool performance for drilling aramid fibre–reinforced plastics, which can help guide process optimizations to achieve the desired hole quality.

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“…Chouhan et al in Ref. studied the mechanism of PEI and PP based Kevlar laminates, in particular, the morphology of the machined volume, using scanning electron microscopy, the damage zone around the laser path, using scanning acoustic microscopy, the surface roughness and the kerf width from optical images. In a numerical model was proposed to study the effect on the HAZ formation of laser pulse length, from nanosecond to microsecond order; the authors found out that the ablation depth increased and HAZ decreased when the shorter pulse length was adopted.…”

Section: Introductionmentioning

confidence: 99%

Multi‐response optimization of CFRP laser milling process based on response surface methodology

Genna

Tagliaferri

Papa

et al. 2017

Polymer Engineering & Sci

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In this study, ANalysis Of VAriance (ANOVA) and Response Surface Methodology were applied to characterize and optimize laser milling of Carbon Fiber Reinforced Polymer (CFRP) plates. The process was performed by means of a 30W Q-switched Yb:YAG fiber laser, working at the fundamental wavelength of 1064 nm. The machined material was a CFRP plate, 4 mm in thickness, obtained by autoclave cure. According to Design of Experiments (DoE) methodology and previous experiences, a Central Composite Design (CCD) was developed and applied. The investigated parameters were the scan speed, the pulse frequency, the number of repetitions of the geometric pattern and the hatch distance. The suitable milling conditions were obtained from the response surface model. The model allows to set the process parameters to obtain the desired depth with an error <3% and a MRR higher than 1.9 × 10−3g/s. POLYM. ENG. SCI., 57:595–605, 2017

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Laser machining of Kevlar fiber reinforced laminates – Effect of polyetherimide versus polypropylene matrix

Cited by 22 publications

References 22 publications

Optimization of machining parameters for kerf angle and roundness error in abrasive water jet drilling of CFRP composites with different fiber orientation angles

Optimization of machining parameters for kerf angle and roundness error in abrasive water jet drilling of CFRP composites with different fiber orientation angles

Comprehensive investigation of cutting mechanisms and hole quality in dry drilling woven aramid fibre–reinforced plastic with typical tools

Multi‐response optimization of CFRP laser milling process based on response surface methodology

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