“…53 Considering the effects of feed rate on the F d at the exit of hole, it is evident that the reason for the increase in the F d is the increase in the feed rate. 41,54,55 But it should be also noted that the F d increases rapidly until 0.1 mm/rev feed rate value, after that the effects of feed rate on F d is much limited in drilling process of both composites. The only exception is the rapid increased F d in drilling of nanocomposite at 0.4 mm/rev feed rate.…”
The reinforcements of nanoparticles have an important role in improving the machinability of nanocomposite materials. Except for the known nanoparticles such as carbon nanotube, graphene, nanoclay, etc., the effect of boron nitride reinforcement on the machinability of composite materials are a recent research topic. In this study, boron nitride nanoparticle was introduced to the matrix resin that brings about additional strength and enhancement in thermal and mechanical properties of the composite. Though it was confirmed that this composition enhances the focused properties, it is necessary to investigate drilling performance of these composite and identify the effects of this boron nitride nanoparticle on machinability of carbon fiber epoxy nanocomposite considering thrust force, delamination factor, etc. Accordingly, while the thrust force is increased by reinforcement of the boron nitride nanoparticles, on the contrary of literature, delamination factor is tend to reduce as compared with reference composite. This experimental study shows the addition of boron nitride nanoparticles help to reduce delamination factor of carbon fiber epoxy nanocomposite. In addition, hole surfaces and drilling mechanism analyzed with optical and scanning electron microscope about damage estimation.
“…53 Considering the effects of feed rate on the F d at the exit of hole, it is evident that the reason for the increase in the F d is the increase in the feed rate. 41,54,55 But it should be also noted that the F d increases rapidly until 0.1 mm/rev feed rate value, after that the effects of feed rate on F d is much limited in drilling process of both composites. The only exception is the rapid increased F d in drilling of nanocomposite at 0.4 mm/rev feed rate.…”
The reinforcements of nanoparticles have an important role in improving the machinability of nanocomposite materials. Except for the known nanoparticles such as carbon nanotube, graphene, nanoclay, etc., the effect of boron nitride reinforcement on the machinability of composite materials are a recent research topic. In this study, boron nitride nanoparticle was introduced to the matrix resin that brings about additional strength and enhancement in thermal and mechanical properties of the composite. Though it was confirmed that this composition enhances the focused properties, it is necessary to investigate drilling performance of these composite and identify the effects of this boron nitride nanoparticle on machinability of carbon fiber epoxy nanocomposite considering thrust force, delamination factor, etc. Accordingly, while the thrust force is increased by reinforcement of the boron nitride nanoparticles, on the contrary of literature, delamination factor is tend to reduce as compared with reference composite. This experimental study shows the addition of boron nitride nanoparticles help to reduce delamination factor of carbon fiber epoxy nanocomposite. In addition, hole surfaces and drilling mechanism analyzed with optical and scanning electron microscope about damage estimation.
“…(ii) The increase in drill speed may also result in cutting of fibers owing to the absences of drill tool bouncing and softening of matrix martial which may results in lower order of responses. (iii) The wide range of thrust force (40-85 N) and torque (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28) was observed with HSS drill material for the tested limits of spindle speed (500-2500 r/min) and feed rate (0.05-0.25 mm/r). But SC drill material showed marginal variations initially due to its high hardness, high stiffness, and keenness of cutting edge.…”
Section: Discussionmentioning
confidence: 94%
“…Marathe and Javali 21 have made drilling experiments to find the influence of tool geometries, drill speeds, and feed rates on delamination damages. Tan et al 22 have conducted drilling experiments on hybrid composite made by CF/GF to evaluate their machinability.…”
Machining processes face two major challenges: sustainability and cleaner production. However, the effective utilization of tool and methods of lubrication system in sustainable machining have been dealt in depth in earlier investigations. This work aims to optimize sustainable machining parameters in drilling process for recyclable carbon fiber-reinforced polypropylene (CFR-PP) composites. This work is focused on modeling and optimization of drilling parameters for sustainable machining with respect to thrust force and torque for CFR-PP composites. The response surface method based on D-optimal design of experiments is used for modeling and optimization with variables such as drill spindle speed and drill feed rate as numerical factors, which includes different drill material as the categorical factor. The influences of tool materials on the sustainable machining are also discussed in detail. Further, the sensitivity analysis is applied to compare the relative impact of control parameters (spindle speed, feed rate, and drill materials) on thrust force and torque. The scanning electron microscope images are used for analyzing the morphologies of drilled surfaces.
“…The existence of the secondary cutting lips on the drill bit is to ensure that the inter-laminar strength of the laminate or uncut chip thickness is sufficient to withstand the thrust force during drilling, and this in turn alleviates the delamination damage. 21 Figure 9.Stages of drilling process with step drill: (a) beginning and (b) end of cutting. 22,23 …”
The present study reports on a systematic experimental test that evaluates the effect of drilling parameters on the open-hole tensile properties of flax fibre epoxy reinforced laminates. Additionally, three lay-up configurations of the flax fibre, namely, [0°/90°]6, [0°]6 and [±45°]6, were investigated and compared. The results demonstrated that the [0°]6 lay-up configuration was superior in terms of mechanical or tensile strength retention of the composites given an 8 mm hole. Conversely, damage due to delamination was not significant due to the changes in feed rate and cutting speed. This suggests that the drilling parameters were less sensitive towards the mechanical strength of the flax fibre composites with the drilled hole. The less severity of the delamination can be attributed to the high fracture toughness (high mode I critical strain energy release) of the flax fibre when compared with that of the synthetic fibre reinforced composite counterparts. The use of the step drill bit design also potentially contributes to the reduced severity of the delamination damage to the flax fibre composites.
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