For comparison, the drilling behaviour of abaca fiber-reinforced polymer (AFRP) composites and Kevlar-reinforced epoxy polymer (KFRP) composites has been studied in the specified experimental condition. The different geometrical drilling tools have been used for the investigation, namely, candlestick (T1), core (T2), standard twist drill (T3), and step cone (T4). The tool feed of 30, 45, and 60 m/min and rotational speed of 1000, 1500, and 2000 rpm have been used for the investigation. The thrust force is chosen as a response parameter for this study. The results revealed that, at lesser rotational speed and tool feed, the thrust force has declined. The result obtained correlates with the abaca fiber-based systems. However, the thrust force of KFRP is higher compared to AFRP composite systems. The axial force generated by candlestick drill is minimal compared to the other drill bits. The following may be responsible for lower thrust force: (1) the axial force distributes circumferential of the cutting tool instead of focusing at the center and (2) the interfacial adhesiveness between the matrix and the fiber is higher. The optimization of drilling process parameters, namely, tool feed and rotational speed on thrust force, has been studied. The results reveal that the tool feed contributed more to axial force compared to rotational speed.

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Comparative Analysis of Drilling Behaviour of Synthetic and Natural Fiber-Based Composites

Nowadays, the demand for fiber-based composites increases continuously compared to conventional materials because of their excellent mechanical properties. Synthetic fibers have specific advantages over natural fibers. It includes strength to weight ratio, durability, wrinkle resistance, and the ability to absorb moisture is less. However, the synthetic material having a few demerits also. To overcome the drawbacks of the synthetic fiber-based composite, an attempt is made to fabricate the hybrid composite specimen to obtain the combined benefits of the synthetic and natural fiber-based composites. The potential applications of the hybrid composites are aerospace, marine, and industrial structural applications. The composite specimen has been fabricated by using different natural and synthetic fibers, namely, Abaca (A), Hemp (H), Kevlar (K), and Glass (G). The three different hybrid composite specimens have been fabricated, each consisting of 5 layers are as follows, 1) the first and last layers of the specimen are Kevlar, and the remaining layers are Abaca fibers, 2) the first and last layers are Glass, and remaining layers are Hemp fibers, 3) first and the last layer is Glass, and remaining layers are Abaca fibers. The experimental results of the Glass/Hemp based composite have been compared with the simulation results. A good agreement has been found between the experimental and the simulation results. The Kevlar/Abaca composite displays a maximum load-carrying capacity in tensile, flexural, and impact is 5600 N, 86 kgf, and 3.625 J, respectively, followed by the Glass/Hemp and Glass/Abaca composites. It is due to the load being transferred in the following order during tests, which is as follows: matrix, natural fibers, and synthetic fibers. The displacement corresponds to load, which also increases during tests due to the percentage of elongation of the fibers. The interfacial bonding between the matrix and the fiber is also responsible for better results. 

Investigation of mechanical properties of dual-fiber reinforcement in polymer composite

The drilling process is the most essential in the final assembly of the mechanical parts. Natural fiber based composites replace traditional materials due to their advantages, such as strength to weight ratio, availability, and environmental hazards. In this work, an attempt has been made to find the minimum thrust force produced by the drill tool at specified drilling process parameters. The drilling process parameters used for the investigation are rotational speed, tool feed, and resins. The spindle speed and feed rate are selected with three levels. Three resin materials were used, namely, epoxy, polyester, and vinyl ester. Taguchi’s L27 orthogonal array was implemented. The result shows that the candlestick drill bit generated lesser thrust force at the specified drilling process parameters, followed by the twist and step cone drill bits.

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Investigation of Drilling Process Parameters of Palmyra Based Composite

The Effect of Cryogenic Cooling and Drill Bit on the Hole Quality when Drilling Magnesium-based Fiber Metal Laminates

Sustainable Hard Machining of AISI 304 Stainless Steel Through TiAlN, AlTiN, and TiAlSiN Coating and Multi-Criteria Decision Making Using Grey Fuzzy Coupled Taguchi Method

V.C. Harissh Ragavendra

Papers

Technical performance of nano-layered CNC cutting tool inserts – An extensive review

Effect of thrust force, torque, and induced temperature on Kevlar reinforced composites during drilling process