Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

The present study addresses the mechanical behavior of polyethylene self-reinforced composites (SRC’s) considering polymeric structural changes after cutting. Selfreinforced polyethylene composite is fabricated using the HOT compaction method by maintaining the processing temperature at 160 ˚C. Conventional and unconventional methods were used to cut the samples of standard dimensions. FTIR images revealed the formation of C=C, C-N, N-H bend bonds after laser cutting, initiated a decrease in the surface roughness value to 4.68µm (Ra).SEM analysis is performed to analyse the structural integrity and damage failure of SRC’s. Structural changes formation after Laser cutting leads to improve the ultimate tensile strength of the laminate 20% compared to Conventional cut samples. Similar trend is noticed for flexural properties and Shore –D hardness values of the SRC composite laminate correlated to polymeric changes with conventional cutting due to the formation of C-N bond but less UTS is observed compared to laser cutting. © 2020, Politechnica University of Bucharest. All rights reserved.

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

Department of Manufacturing Engineering

World University root node

UPB Scientific Bulletin, Series D: Mechanical Engineering

Impact of polymeric changes on mechanical and structural properties of polyethylene self reinforced polymer composites

The present study addresses the mechanical behavior of polypropylene self-reinforced composites (SRC's) considering polymeric structural changes after cutting. Self-reinforced polypropylene composite is fabricated using the HOT compaction method by maintaining the processing temperature at 164ãC. Conventional and unconventional cutting methods were used to cut the samples of standard dimensions. FTIR images revealed the formation of C=C, C-F, Halogen bonds after AWJ cutting initiated a decrease in the surface roughness value to 4.5μm (Ra). SEM analysis is performed to analyse structural integrity and damage of SRC's. Structural changes formation after AWJ cutting leads to improve the ultimate tensile strength of the laminate by 20% compared to conventional cut samples. A similar trend is noticed for flexural properties and Shore-D hardness values for the SRC composite laminate correlated to polymeric changes with Conventional cutting due to the formation of C-N bond is observed after Laser cutting. © 2020 Deepa A et al., published by De Gruyter 2020.

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Science and Engineering of Composite Materials

A Comparative Study of Structural Changes in Conventional and Unconventional Machining and Mechanical Properties Evaluation of Polypropylene Based Self Reinforced Composites

With advancements in practiced machines, there has been a broad requirement for more up-to-date materials that have special mechanical properties notwithstanding when exposed to unfriendly ecological conditions. Among the materials that have been researched, fiber-reinforced polymer (FRP) has turned out to be a good possibility for the generation of sound structures. In addition to being one of the least expensive types of composites, it is not difficult to fabricate and broadly accessible. Moreover, the mechanical properties of these composites have turned out to be utilized over an extensive variety of natural impacts. The investigation of their naturally visible properties, like visible disfigurement, percent area of fraction, circularity ratio, and micro hardness, are essential surface properties that determine the strength and the appearance of the external part of the composites after exposure to the degrading conditions. This chapter analyzes these properties, which were found by exposing the composite samples to a hygrothermal environment as well as chemical exposure. The samples were of the following particular types, including glass-FRP (GFRP) and carbon-FRP (CFRP) laminates and GFRP thermocol sandwich composites. © 2019 Elsevier Ltd. All rights reserved.

VIT Unitversity

Structural Health Monitoring of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites

Fracture surface morphologies in understanding of composite structural behavior

Present scenario of mobile communication is to meet the demands of Error free and high data rate communication. This can be achieved with multi carrier modulation technique. In Multi carrier modulation, the transmitting data is split into several components which is modulated and transmitted with different carriers which leads to less Inter Symbol Interference, multipath fading and impulse noise. A novel method of multi carrier modulation and demodulation was done by multiplying user symbols with several sub carriers then combining the several modulated signals and transmitted over a noisy channel. Analysis was carried out after demodulation by comparing received symbols with transmitted symbols. Simulation was carried out to analyze the Bit error rate (BER) performance of multi carrier modulation system as a function of Number of sub carriers and spacing between them. It is found that BER performance is not consistent for all sub carriers. BER performance degrades as sub carriers increases from 1 to n, where n=fs/2. It is also observed that the BER performance is approximately stable throughout the specified spectrum for a given sub carrier. © BEIESP.

International Journal of Engineering and Advanced Technology

Bit error performance of variations along the spectrum for the several sub carrier

Materials Today: Proceedings

Analysis on Multi Linkage Brake System with Variable Pedal Ratio

The composite materials are used widely in our daily life in various forms. The employability of these sandwich composites in the aerospace, shipbuilding, construction of the bridges and different kind of architectures is increasing these days. To make the better sandwich composite with the combination of the glass fiber as skins and polyurethane foam (PUF), hexagonal structured honeycomb as a core is used and then tested. The fabrication of the sandwich composite is made using the vacuum bag molding technique. The fabricated samples are then tested using flexural test. The testing results which were obtained compared with the analysis done in the ANSYS. The main aim is to determine the better composite of the different foams. © IAEME Publication.

International Journal of Mechanical Engineering and Technology

Investigation on mechanical behaviour of glass fiber reinforced with polyurethane foam and honeycomb

With the advancement in efficient machines, there has been an extensive need for the newer materials that have exceptional mechanical properties even when exposed to adverse environmental conditions. Among all the materials that have emerged from extensive research, glass fiber reinforced polymer (GFRP) has proved to be a worthy candidate for the production of high-quality structures. In addition to being one of the cheapest forms of composites, it is easily manufactured and widely available. Additionally, the mechanical properties of these composites have proved their potential to be used over a wide range of environmental effects. The study of their macroscopic properties such as tensile strength, flexural strength, as well as their microscopic structural modifications due to the external loading are of utmost importance. In this chapter an effort has been made to relate the microscopic to the macroscopic properties under prestressing and the presence of moisture and temperature. This has provided us with extensive data on how the degradation of the fibers takes place over time. The different materials include a laminated form of GFRP, and a sandwich composite of GPRP with a layer of thermocol. © 2019 Elsevier Ltd. All rights reserved.

Structural health monitoring of fiber polymer composites

Department of Electrical Engineering

School of Electrical Engineering

2017 International Conference on Innovative Research In Electrical Sciences (IICIRES)

Review on sheppard taylor topology based luo-converters

Present works explains about machining of self-reinforced Polypropylene composite fabricated using hot compaction method. The objective of the experiment is to find optimum machining parameters for Polypropylene (PP). Laser power and Machining speed were the parameters considered in response to tensile test and Flexure test. Taguchi method is used for experimentation. Grey Relational Analysis (GRA) is used for multiple process parameter optimization. ANOVA (Analysis of Variance) is used to find impact for process parameter. Polypropylene has got the great application in various fields like, it is used in the form of foam in model aircraft and other radio-controlled vehicles, thin sheets (∼2-20μm) used as a dielectric, PP is also used in piping system, it is also been used in hernia and pelvic organ repair or protect new herrnis in the same location. © 2017 Published under licence by IOP Publishing Ltd.

IOP Conference Series: Materials Science and Engineering

Analysis and optimization of machining parameters of laser cutting for polypropylene composite

This Paper focuses on obtaining the mechanical properties and the effect of the different machining techniques on self-reinforced composites sample and to derive the best machining method with remarkable properties. Each sample was tested by the Tensile and Flexural tests, fabricated using hot compaction test and those loads were calculated. These composites are machined using conventional methods because of lack of advanced machinery in most of the industries. The advanced non-conventional methods like Abrasive water jet machining were used. These machining techniques are used to get the better output for the composite materials with good mechanical properties compared to conventional methods. But the use of non-conventional methods causes the changes in the work piece, tool properties and more economical compared to the conventional methods. Finding out the best method ideal for the designing of these Self Reinforced Composites with and without defects and the use of Scanning Electron Microscope (SEM) analysis for the comparing the microstructure of the PP and PE samples concludes our process. © 2017 Published under licence by IOP Publishing Ltd.

Machining and characterization of self-reinforced polymers

Indian Journal of Science and Technology

Effect of Hygrothermal Loading on Laminate Composites

2016 IEEE Aerospace Conference

Wing design for a low altitude unmanned aerial vehicle: A nuanced study of aerodynamic drag

Now a days, people have a penchant for luxury, comfort and safety in each and every aspect of their lives provided money and technology available with the mankind. This project aims towards reducing the physical effort by humans to lift an automobile by automating the Hydraulic Jack through coupling it with a wiper motor and a radio frequency (RF) module. It works on the mechanism of conversion of rotatory motion of the wiper motor into the reciprocating motion of the hydraulic jack's plunger. The functioning of the motor being controlled by the RF module and a remote, through simple push of a button one could lift a heavy vehicle thereby reducing the physical effort considerably. A prototype illustrating the aforementioned mechanism was designed and fabricated. Also, it was tested and its functioning can be successfully illustrated. © 2006-2016 Asian Research Publishing Network (ARPN).

ARPN Journal of Engineering and Applied Sciences

Design, development and testing of novel remote controlled electrically operated hydraulic jack

Recent trend in reduction of cost, durability, reliability, and less weight with excellent mechanical properties and resistance to corrosion, composites find a huge application in all fields of engineering and are greatly used in day to day life in many fields. Properties like high specific weight, stiffness etc. made everyone to look for replacing the conventional metals and alloys with composites. In order to use them effectively according to our required size and shape machining is necessary, but during machining an appreciable amount of heat is generated and this affects the structural properties of composites. The present paper aimed at presenting the past work done in this area. © 2006-2016 Asian Research Publishing Network (ARPN). All rights reserved.