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

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
A. Mohan Kumar ◽  
R. Rajasekar ◽  
P. Manoj Kumar ◽  
R. Parameshwaran ◽  
Alagar Karthick ◽  
...  
Keyword(s):  
Axial Force ◽  
Rotational Speed ◽  
Natural Fiber ◽  
Thrust Force ◽  
Drilling Process ◽  
Response Parameter ◽  
Reinforced Polymer ◽  
Drill Bits ◽  
Drilling Tools ◽  
The Matrix

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.

scholarly journals Investigation of Drilling Process Parameters of Palmyra Based Composite

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
A. Mohan Kumar ◽  
R. Rajasekar ◽  
P. Manoj Kumar ◽  
R. Parameshwaran ◽  
Alagar Karthick ◽  
...  
Keyword(s):  
Process Parameters ◽  
Natural Fiber ◽  
Thrust Force ◽  
Weight Ratio ◽  
Drilling Process ◽  
Mechanical Parts ◽  
Final Assembly ◽  
Drill Bits ◽  
Cone Drill ◽  
Drill Tool

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.

Drilling Force and Chip Morphology in Drilling of PCB Supported Hole

2011 ◽  
Vol 188 ◽  
pp. 429-434 ◽  
Author(s):  
L.P. Yang ◽  
Li Xin Huang ◽  
Cheng Yong Wang ◽  
L.J. Zheng ◽  
Ping Ma ◽  
...  
Keyword(s):  
Feed Rate ◽  
Printed Circuit Board ◽  
Thrust Force ◽  
Chip Morphology ◽  
Cutting Parameters ◽  
Spindle Speed ◽  
Circuit Board ◽  
Drilling Process ◽  
Drilling Force ◽  
Drill Bits

Supported holes of Printed circuit board (PCB) are drilled with two different drill bits. Drilling force (thrust force and torque) and chip morphology are examined at different cutting parameters, and the effects of the two drills are discussed. The results indicate that the drilling force and chip morphology are affected by the feed rate, spindle speed and drill shape. Thrust force increases with the increasing feed rate, and decreases with the increasing spindle speed. Optimization of drill geometry can reduce the thrust force significantly, and is effective in chip breaking which can improve the chip evacuation during the drilling process.

Thermal Conductivity Study of Biomass Reinforced Polymer Composites

2020 ◽  
Author(s):  
Birce Dikici ◽  
Samarth Motagi ◽  
Prahruth Kantamani ◽  
Suma Ayyagari ◽  
Marwan Al-Haik
Keyword(s):  
Thermal Conductivity ◽  
Polymer Composites ◽  
Vinyl Ester ◽  
Natural Fiber ◽  
Resin Composite ◽  
Vinyl Ester Resin ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
The Matrix ◽  
Nano Cellulose

Abstract The aim of this study was to investigate the thermal conductivity of natural fiber reinforced polymer composites (NFRP) as potential structural materials. As a natural fiber, Bermuda grass seeds, conifer cones and pinecones are selected. The matrix comprised Vinyl ester resin. The mechanical properties (tensile strength and Young’s modulus) and fractography analysis were investigated in our previous study (Dikici B. M. S.-H., 2019). In the current study, the thermal conductivity was probed using transient plane source technique implemented in the TPS 2500S Thermal Constants Analyzer. The addition of 9% Bermuda fibers yielded a decrease of approximately 19.3% in thermal conductivity compared to that of the neat epoxy. With the addition of 9% nano cellulose fibers, a decrease of approximately 40.7% in thermal conductivity was observed in the nanocellulose/vinyl ester resin composite compared to the neat vinyl ester samples.

Critical Thrust Force for On-Set Delamination of Hybrid FRP Composite during Drilling Process

2017 ◽  
Vol 740 ◽  
pp. 111-117 ◽  
Author(s):  
Chye Lih Tan ◽  
Azwan Iskandar Azmi ◽  
Noorhafiza Muhammad
Keyword(s):  
Thrust Force ◽  
Dimensional Accuracy ◽  
Limiting Factor ◽  
Drilling Process ◽  
Frp Composites ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Hybrid Fibre ◽  
Fibre Reinforced Polymer ◽  
Critical Thrust Force

Hole quality is one of the important criteria for hybrid composite components when assessing drilling behaviour because it influences the strength of composite parts post assembly. Nonetheless, some unique characteristics of hybrid Fibre-Reinforced Polymer (FRP) composites make them difficult to obtain the required quality and strict final dimensional accuracy. Based on previous studies, delamination has been recognized as one of the critical failure mechanisms in the drilling operation of FRP composites. It can often be the limiting factor for the final composite materials applications. Thus, in order to achieve a delamination-free in the drilling of hybrid FRP composites, an analytical model and a series of thrust force experiments are endeavoured in this study. The main purpose of the model is to compute the critical thrust force at the on-set of delamination during the drilling process. Results of this analytical study indicated that the delamination damage can be alleviated if the applied thrust force is lower than the critical thrust force value. Importantly, a good agreement was evident between the estimated critical thrust force and the measured thrust force in this particular study.

scholarly journals Effect of graphene nanoplatelet filling on mechanical properties of natural fiber reinforced polymer composites

2021 ◽  
Vol 63 (4) ◽  
pp. 322-328
Author(s):  
Yusuf Eren Erdoğdu ◽  
Engin Eren Korkmaz ◽  
Şemsettin Temiz
Keyword(s):  
Mechanical Properties ◽  
Natural Fiber ◽  
Epoxy Composite ◽  
Composite Plates ◽  
Graphene Nanoplatelets ◽  
Processing Times ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
The Matrix ◽  
Flexural Tests

Abstract In this study, the mechanical properties of plain woven jute-epoxy composite materials were investigated after filling graphene nanoplatelets (GNPs) in different proportions. The time dependent changes in the viscosity and temperature of unfilled epoxy resin, with 0.5, 1 and 2 wt.-% graphene nanoplatelets filled epoxy resins were observed. Woven jute reinforced unfilled, 0.5 wt.-% GNPs filled and 1 wt.-% GNPs filled epoxy composite plates were produced by using vacuum assisted resin transfer molding (VARTM) at the same waiting and processing times. Specimens were prepared and subjected to tensile and flexural tests according to ASTM D 3039 and ASTM D 790 standards, respectively. Images were taken and evaluated with a scanning electron microscope (SEM) in areas where tensile damage occurred. It was observed that the gap amount between the fiber and the matrix increased and the interface adhesion decreased as the fill amount increased in the composites produced. The testing results indicated that the tensile and flexural properties of composites decreased at 0.5 wt.-% and 1 wt.-% during the GNPs loading as compared to unfilled composites.

Experimental and numerical investigation of the thrust force and temperature generation during a drilling process

2021 ◽  
Vol 63 (6) ◽  
pp. 581-588
Author(s):  
Yavuz Kaplan ◽  
Muammer Nalbant
Keyword(s):  
Numerical Analysis ◽  
Thrust Force ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Drilling Process ◽  
Machining Parameters ◽  
Closed Area ◽  
Drill Bits ◽  
Dimensional Simulation ◽  
Made In

Abstract Although advances have been made in manufacturing technology, a number of problems still exist in the drilling process due to the chip formation which occurs in a closed area. This situation results in unpredictable force, torque and temperature generation. This study investigated the machining parameters in the drilling process using a finite element method (FEM). In the numerical analysis, thrust force, torque and temperature were calculated by three-dimensional simulation. Drilling processes were carried out with twist drill bits at three different cutting speeds and three different feed rates. The numerical analysis results were verified by experimental studies. The results show that FEM is a good candidate for obtaining cutting forces and temperature generation in drilling process.

scholarly journals Effect of Thrust Force and Torque Analysis on Chemically Treated Kevlar Reinforced Composites During Drilling Process

2020 ◽  
Vol 9 (3) ◽  
pp. 3101-3106 ◽  
Keyword(s):  
Polyester Resin ◽  
Thrust Force ◽  
Machining Process ◽  
Drilling Process ◽  
Reinforced Composites ◽  
Twist Drill ◽  
Drill Bits ◽  
Literature Reviews ◽  
Chemically Treated ◽  
Torque Analysis

Composites applications are widely used in many areas. Due to the enhancement of various properties. Now a days kevlar composite has widely used because of various properties like tensile , compression, shear. Drilling is the majority important machining process in making assembly of components within a negligible tolerance. Drilling in kevlar composites is difficult due its extradionary mechanical properties like high toughness and hardness. Thrust force and torque are the major influences for delamination during various machining of reinforcement polymer composites. Various paramaters are considered to reduce defects like delamination and fiber crushing. It is found from various literature reviews surface modification has enhancing the intermolecular bonding strength between fiber reinforced layers. Our paper deals with affect of process parameters on thrust force with respect to torque during drilling of Kevlar composites with and without chemically treated fibers. The composite lamina is prepared for the investigation of 60/40 kevlar-polyester resin on weight basis. The chemicals are used to treat the fibers such as Dichloromethane, methanol and distilled water with specified intervals of time. Twist and core drill bits are used to make holes. Results suggested that twist drill with chemically treated fiber having minimum thrust force. Our aim to identify the minimum delamination of composites.

Green composites and their contribution toward sustainability: A review

2021 ◽  
pp. 096739112110093
Author(s):  
Edgar Vázquez-Núñez ◽  
Andrea M Avecilla-Ramírez ◽  
Berenice Vergara-Porras ◽  
María del Rocío López-Cuellar
Keyword(s):  
Natural Fiber ◽  
World Market ◽  
Raw Material ◽  
Green Composites ◽  
Green Materials ◽  
Global Problems ◽  
The Matrix ◽  
Green Economies ◽  
Green Polymer ◽  
World Environment

The current world environment scenario demands new and more eco-friendly solutions to global problems that cover the demands for materials. This sector has included green polymer-based composites and natural reinforcers from origins of renewable sources, these Green Composites (GC), natural-fiber-reinforced bio-composites in which the matrix is a bio-based polymer, have shown attractive characteristics. Biodegradability is one of the most important attributes for these new “green” materials, in that this characteristic allows for their introduction into the world market as an environmental solution. The manufacturing processes for obtaining these materials have observed important improvements because each raw material exhibits different properties and characteristics and their eco-friendly character has facilitated its incorporation into diverse sectors, such as construction, automotive, packaging, and medicine, among others. At present, this segment represents an important income for some economies, especially those where these resources are available, enhancing the creation of green economies, strengthening the world’s efforts toward sustainability.

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