Influence of Carbon based Fillers on EDM Machinability of CFRP

Kumaran, Varun Urundolil; Kliuev, Mikhail; Billeter, Roman; Wegener, Konrad

doi:10.1016/j.procir.2020.03.153

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…Values as low as 100 µs would indicate that the time in which the electrical discharge acts on the material is insufficient. In particular, if an inadequate time is not set, the temperatures reached during the process may be insufficient, making it difficult to machine the die and resulting in a variation in the roughness generated [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…This minimizes the resistance of the composite material, allowing higher machining temperatures to be reached that vaporize the polymer matrix and removing a greater amount of material per electrical discharge. Notably, lower current levels are required to achieve maximum material removal rates in EDM drilling of composite materials compared to micro EDM drilling operations [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…As there is no electrical conductivity between the matrix and electrode, the dielectric properties of the matrix must be overcome for fibre-to-fibre discharge to occur [ 25 ]. This is removed and adheres to the electrode, which can lead to variations in the final diameter [ 26 ]. At the same time, machining temperatures can lead to die loss during machining, resulting in a poor surface finish and deterioration of the workpiece [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the field of CFRP drilling by EDM, Kumaran et al [ 26 ] have studied the machining of an epoxy matrix unidirectional CFRP. For this purpose, they used a 1 mm diameter brass electrode.…”

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of CFRP Drilling by Electrical Discharge Machining

et al. 2022

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The novelty of EDM machining as a drilling operation for composite materials means that there is no consensus on the influence of the parameters that optimise the final quality. For these reasons, a characterisation of the EDM drilling process of a unidirectional composite material has been developed. The influence of several cutting parameters has been related to the quality of the final hole obtained. Thus, macrogeometric aspects in terms of conicity and final diameter and microgeometric aspects in terms of surface quality have been evaluated. In addition, the final state of the material and the wear of the electrode have been evaluated by visual inspection, allowing the range of cutting parameters that offer the best performance to be established. Finally, a series of contour diagrams based on predictive models have been obtained to establish a direct relationship between input and output variables.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In the field of CFRP drilling by EDM, Kumaran et al [ 26 ] have studied the machining of an epoxy matrix unidirectional CFRP. For this purpose, they used a 1 mm diameter brass electrode.…”

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of CFRP Drilling by Electrical Discharge Machining

et al. 2022

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“…The results show that both the fiber orientation angle and the chip thickness have a significant effect on cutting forces. In the paper [28], an experimental study of CFRP EDM drilling was conducted. Different filler materials and process parameters were investigated.…”

Section: Research Of Cfrp Attributesmentioning

confidence: 99%

The Use of CFRP for Structural Reinforcement—Literature Review

Pawlak

Górny

Dopierala

et al. 2022

Metals

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Carbon fiber reinforced polymer (CFRP) composites are increasingly being used to strengthen structures and to retrofit existing structures. CFRP composites are used in various industries: construction, automotive, and many others. This literature review has shown that CFRP composites find numerous practical applications. Improving structures by reinforcing them with CFRP composite is an innovative approach in design. This review aims to explore the current state of the art in the types of structures that can be reinforced with CFRP, and modifications to the CFRP composite as an additional aspect to increase the strength of the reinforced structure. It has been shown that regardless of the type of reinforced material, the most critical element in this connection is the bonded joint. Proper surface preparation and the use of an appropriate adhesive are also important.

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Assessing wire EDM as a novel approach for CFRP drilling: performance and thermal analysis across lay-up configurations

Bajoria,

Alshaer,

Abdallah

2024

Int J Adv Manuf Technol

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Conventional drilling of carbon fibre–reinforced plastic (CFRP) presents significant challenges due to the material’s abrasive nature and anisotropic properties, leading to tool wear, delamination, and surface damage. To address these challenges, this study pioneers the use of wire electrical discharge machining (WEDM) to evaluate the drilling performance of thick CFRP lay-up configurations mainly unidirectional and multidirectional, marking the first application of WEDM for CFRP drilling. The study evaluates material removal rate (MRR), delamination factor (DF), and surface damage while employing an analytical solution to estimate surface temperature and heat conduction in the laminates. An eight-full factorial experimental design was employed, involving variations in ignition current (3 A and 5 A) and pulse-off time (4 µs and 8 µs). The findings revealed that the multidirectional lay-up achieved an MRR of 2.85 mm3/min, significantly outperforming the unidirectional lay-up’s MRR of 0.95 mm3/min, representing a 300% increase at 5 A and 4 µs. However, the increase in discharge energy led to surface damage such as delamination, frayed fibres, and irregular circularity, especially evident in the unidirectional lay-up. For delamination, the multidirectional lay-up had the highest top DF of 1.4 at 5 A and 6 µs, while the unidirectional lay-up achieved the peak bottom DF of 1.24 at the same levels. While none of the parameters significantly affected the responses, the current exhibited the highest contribution ratios. Analytical predictions of the thermal distribution indicated a 45-µm delamination length at the laminate surface and depth, aligning closely with experimental predictions of 30–50 µm.

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Influence of Carbon based Fillers on EDM Machinability of CFRP

Cited by 6 publications

References 15 publications

Design and Analysis of CFRP Drilling by Electrical Discharge Machining

Design and Analysis of CFRP Drilling by Electrical Discharge Machining

The Use of CFRP for Structural Reinforcement—Literature Review

Assessing wire EDM as a novel approach for CFRP drilling: performance and thermal analysis across lay-up configurations

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