An assessment of thermally influenced and delamination-induced regions by composites drilling

Loja, M. A. R.; Alves, Marcelo Severo; Bragança, Ivo M. F.; Rosa, Renato de Oliveira; Barbosa, Inês de Carvalho Jerónimo; Barbosa, J. Infante

doi:10.1016/j.compstruct.2018.02.046

Cited by 27 publications

(11 citation statements)

References 21 publications

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“…Based on the identification of harmful sets of cutting parameters, the authors proposed the variable feeding method to reduce the delamination damage of fibrous composites and found that the use of the new drilling method could reduce the push-out delamination factor by 37% for the CFRP material. Loja et al [10] carried out an assessment of thermally influenced and delamination-induced regions during the drilling of fibrous composites. It was found that the tool geometries and the thickness of the workpiece were the key factors affecting significantly the drillinginduced damage of the composite laminates.…”

Section: Introductionmentioning

confidence: 99%

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An investigation of drilling high-strength CFRP composites using specialized drills

Chen

et al. 2019

Int J Adv Manuf Technol

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Machining of high-strength carbon fiber reinforced polymers (CFRPs) has faced great challenges in quality control and tool wear management due to their inherent heterogeneity and high abrasiveness leading to serious workpiece damage and rapid tool wear. The present paper contributes to an experimental investigation of evaluating the machinability of one type of high-strength T800/X850 CFRPs representative of aircraft components. The novelty of this work lies in identifying the effects of different specialized drills on the drilling process of the high-strength CFRPs by covering a variety of aspects involving the drilling forces, hole morphologies, workpiece damage, hole dimensional accuracy, and tool wear. Both the in-situ and post-process measuring results were correlated with the input process parameters and the used drill bits. A particular focus was placed on the inspections of the resulting tool morphologies and wear mechanisms governing the drilling of the high-strength CFRPs. The results highlight the importance of using functionally designed drills and optimum cutting conditions in realizing the damage-free drilling of T800/X850 composites.

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Section: Introductionmentioning

confidence: 99%

“…angle as denoted in Fig.6. Different types of fiber removal processes associated with the laminate orientations and drill geometrical features determine the final cut surfaces and the subsequent hole defects.Figures 7,8,9,10,11,and 12 present the surface morphologies of CFRP holes produced by three…”

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confidence: 99%

An investigation of drilling high-strength CFRP composites using specialized drills

Chen

et al. 2019

Int J Adv Manuf Technol

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“…At the same time, it was observed that the pushout delamination is initiated in a shorter amount of time at higher cutting speed because of heat generated, which makes the matrix softer and less stiff (Krishnaraj et al, 2012). It is also observed that due to the low feed rate and high speed, a temperature rise occurs, which in turn enhances the delamination in the composite (Geng et al, 2017;Loja et al, 2018). In contrast, Gaitonde observed that delamination was minimized by enhancing the cutting speed of the tool in traditional machining of carbon fiber composites (Gaitonde et al, 2008).…”

Section: Optimization Of Drilling Parametersmentioning

confidence: 99%

A review on strengthening, delamination formation and suppression techniques during drilling of CFRP composites

Rathod

Patel

et al. 2021

Cogent Engineering

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Carbon fiber-reinforced composite laminates are progressively appealing for several applications in various manufacturing sectors such as aeronautical and automobile, because of their amazingly predominant mechanical properties. This has subsequently led to an increase in research of various machinability techniques emphasizing on both conventional and non-conventional methods. Typically, conventional drilling is one of the most significant machining processes for most kinds of fiber composite laminates. The most unsolicited damage termed as delamination during drilling has recently become one of the most influential research subjects as numerous engineers in manufacturing sector have been trying to prevent this problem over decades. This review paper briefly discusses about the incorporation of different types of fillers in carbon fiber-reinforced composites. The paper also summarizes the steady progress in drilling-induced delamination of carbon fiber laminates. It covers the delamination formation mechanism, delamination suppression strategies, and the optimization of various drilling parameters to reduce the delamination damage. The present article provides researchers an opportunity to deepen their knowledge on specific aspects by exploring different methods for reducing delamination in CFRP composites.

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“…Typically, carbon fiber-reinforced plastic (CFRP) is employed as the metals substitutions in lots of weight-critical components in aerospace, owing to the good properties, such as high specific strength, high specific stiffness and high modulus [1][2][3][4][5]. In reality, subsequent machining operations, such as milling, drilling, are necessary to be required for assembling [6].…”

Section: Introductionmentioning

confidence: 99%

Study On The Formation Mechanism of Cutting Surface of Carbon Fiber Reinforced Composites

Dong

et al. 2021

Preprint

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Carbon fiber-reinforced plastic (CFRP) is used widely in aerospace. The cutting mechanism of CFRP is markedly different from that of metals due to anisotropic and non-homogeneous material structure. The cutting mechanisms are highly dependent on the fiber orientation. The quality of the machined surface can be affected by the fiber fracture models. In this paper, based on the elastic foundation beam theory and the Hertzian contact theory, the cutting mechanics are established. And the cutting model is simulated by the three-dimensional micro-scale numerical model. Then, the continuous varying cutting mechanism and the sub-damage are deeply studied in detail by combining the cutting mechanics model and the simulation model. The results indicate that the fiber orientation θ=80° and θ=150° is the transition critical point of the fracture form. When θ=0°, the fiber failure mode is buckling-dominated. When 0°<θ<80° and 150°<θ<180°, the fiber failure mode is dominated by contact fracture. When 80°<θ<150°, the fiber failure mode is bending-dominated. The cutting mechanics model and finite element model can effectively reflect the evolution law of CFRP machined surface.

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An assessment of thermally influenced and delamination-induced regions by composites drilling

Cited by 27 publications

References 21 publications

An investigation of drilling high-strength CFRP composites using specialized drills

An investigation of drilling high-strength CFRP composites using specialized drills

A review on strengthening, delamination formation and suppression techniques during drilling of CFRP composites

Study On The Formation Mechanism of Cutting Surface of Carbon Fiber Reinforced Composites

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