A Study on Machining Performances of Micro-Drilling of Multi-Directional Carbon Fiber Reinforced Plastic (MD-CFRP) Based on Nano-Solid Dry Lubrication Using Graphene NanoPlatelets

Abstract

The objective of this study is to investigate the tribological behavior of graphene nanoplatelets (xGnPs) as nano-solid lubricants, and to evaluate their applicability to the micro-drilling of multi-directional carbon fiber-reinforced plastic (MD-CFRP). To verify the tribological effect of nano-solid lubricants, three kinds of xGnPs (xGnP C-750, xGnP M-5, and xGnP H-5), multiwall carbon nanotubes (MWCNTs), and hBN are compared by the ball-on-plate test. Of these, three xGnPs are selected as nano-solid lubricants to investigate the micro-drilling performance of MD-CFRP using nano-solid dry lubrication, and the experimental results demonstrate that all xGnPs can enhance lubrication action in terms of surface quality (delamination, uncut fiber, and inner surface) and tool wear. In particular, larger graphene nanoplatelets (xGnP M-5 and xGnP H-5) are superior to the smaller one (xGnP C-750) by guaranteeing enhanced sliding action between the tool grain and the CFRP composite.

A review on tool wear issues in drilling CFRP laminates

“…Therefore, measuring the average flank wear width can ensure a fair evaluation of tool performance and its serving life. Since such a measurement can be done manually via an optical microscope, it has become a convenient means being extensively used in various studies (Inoue et al, 1997;Ogawa et al, 2012Ogawa et al, , 2015James and Sonate, 2018;Dogrusadik and Kentli, 2019a;Dogrusadik and Kentli, 2019b;Kim et al, 2019;Fu et al, 2020;Huang et al, 2021;Kim et al, 2021). However, since the flank wear land around drill edges is often nonuniform and irregular, flank wear width may not be a perfect indicator to quantify the actual drill wear severity during drilling of CFRP laminates.…”

The Thickness Effect of PSF Nanofibrous Mat on Fracture Toughness of Carbon/Epoxy Laminates

“…Using thermoplastics as additives in thermoset-based CFRPs is an attractive method for enhancing their fracture toughness [11][12][13][14]. These additives can be in the form of particles [15][16][17][18], film [19,20], or fibers [21][22][23][24][25][26], and range in size from nano-to micrometers. These types of materials have long been used for toughening laminates, except for nanofibers which were introduced in the last few years [27] and have not attracted researchers' attention until recently [28].…”