Tamil Nadu, India
Tamil Nadu, India

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Senthil Kumar P.,The Rajaas Engineering College | Manisekar K.,Center for Manufacturing science
Tribology Transactions | Year: 2016

This article deals with the effect of extrusion on the microstructures and tribological properties of powder metallurgy–fabricated copper–tin composites containing MoS2 by optical microscopy, scanning electron microscopy (SEM), and tribotesting. The extrusion decreases the number of pores and increases the density and hardness and thus improves the tribological properties of the composites. Results demonstrated that abrasion is the dominant wear mechanism in all extruded composites, whereas a combination of adhesion and delamination appears to be the governing mechanism for prepared composites. The developed hot-extruded composites exhibited lower coefficient of friction and wear rates compared to prepared composites. Design Expert software was used to develop contour map. © 2016 Society of Tribologists and Lubrication Engineers.

Bensam Raj J.,The Rajaas Engineering College | Marimuthu P.,Syed ammal Engineering College | Marimuthu P.,Anna University | Prabhakar M.,National University of Singapore | Anandakrishnan V.,National Institute of Technology Tiruchirappalli
International Review of Mechanical Engineering | Year: 2014

The aim of the present investigation has used to predict the stress formability index and the pore closure behavior of the sintered Al-SiC composites. Aluminium composite powder reinforced by silicon carbide containing 10% and 20% SiC. Three different sintering time intervals were proposed namely 1.5, 3 and 4.5 hrs at 605°C were completely investigated. The effect of SiC addition on the formability stress index value was studied. For higher SiC addition preforms the formability stress index reaches very high value. With increasing sintering time the formability stress index increases due to a decrease pore. It was enlightened to obtain a pore closure verification three novel stress based pore closure rate indices were proposed and analysed for all the above said preforms and their variations with respect to their relative density were plotted and discussed. The Formability stress index value were evaluated and discussed in terms of matrix and geometric work hardenings. © 2014 Praise Worthy Prize S.r.l. - All rights reserved.

Mathan V.,The Rajaas Engineering College
Advanced Materials Research | Year: 2014

AA2024-T4 Al substrate with and without bonded E-glass/Epoxy patches were undergone for the experimental study of tensile strength and fatigue behavior. The Al substrates were machined to edge cracked specimens. The strength of the substrate was decreased due to the presence of crack when compared with un-cracked Al substrate. The patches were made in liquid epoxy resin instead of film adhesives and it was discovered that the both static strength and fatigue life were significantly increased for bonded composite patches. Different ply patches were applied on the cracked Al substrates and it was noted that the 9ply patch demonstrated its effectiveness in preventing static failure and increasing fatigue life of the cracked substrates. © (2014) Trans Tech Publications, Switzerland.

Senthil Kumar P.,The Rajaas Engineering College | Manisekar K.,Center for Manufacturing science | Subramanian E.,Center for Manufacturing science | Narayanasamy R.,Indian National Institute of Engineering
Tribology Transactions | Year: 2013

The wear and sliding friction response of a hybrid copper metal matrix composite reinforced with 10 wt% of tin (Sn) and soft solid lubricant (1, 5, and 7 wt% of MoS2) fabricated by a powder metallurgy route was investigated. The influence of the percentages of reinforcement, load, sliding speed, and sliding distance on both the wear and friction coefficient were studied. The wear test with an experimental plan of six loads (5-30 N) and five sliding speeds (0.5-2.5 m/s) was conducted on a pin-on-disc machine to record loss in mass due to wear for two total sliding distances of 1,000 and 2,000 m. The results showed that the specific wear rate of the composites increased at room temperature with sliding distance and decreased with load. The wear resistance of the hybrid composite containing 7 wt% MoS2 was superior to that of the other composites. It was also observed that the specific wear rates of the composites decreased with the addition of MoS2. The 7 wt% MoS2 composites exhibited a very low coefficient of friction of 0.35. The hardness of the composite increased as the weight percentage of MoS2 increased. The wear and friction coefficient were mainly influenced by both the percentage of reinforcement and the load applied. Wear morphology was also studied using scanning electron microscopy and energy-dispersive X-ray analysis. © 2013 Copyright Taylor and Francis Group, LLC.

Senthil Kumar P.,The Rajaas Engineering College | Manisekar K.,Center for Manufacturing science
Indian Journal of Engineering and Materials Sciences | Year: 2014

The present investigation aims to develop MoS2 added, self lubricated copper-tin hybrid composite with different weight fractions of MoS2 and characterize tribological properties. In order to evaluate the behavior of composites satisfying multiple performance measures, Taguchi approach has been adopted. An orthogonal array and an analysis of variance are employed to the influence of parameters like as wt% of MoS2, load, sliding speed and sliding distance on dry sliding wear of the composites. Results show that sliding distance has the highest influence followed by a load and reinforcement. Confirmation tests are carried out to verify the experimental results. The morphology of the worn-out surfaces is examined to understand the wear mechanisms. The responses have been predicted using both Artificial Neural Network (ANN) and Taguchi method so that a comparative evaluation can be made. From this study, it is concluded that neural network predicts the responses more accurately than Taguchi prediction. © 2014, National Institute of Science Communication and Information Resources (NISCAIR). All rights received.

Senthil Kumar P.,The Rajaas Engineering College | Manisekar K.,Center for Manufacturing science | Narayanasamy R.,Indian National Institute of Engineering
Tribology Transactions | Year: 2014

Experimental investigations were undertaken to determine the abrasive wear behavior of various percentages of Cu-SiC-Gr hybrid composites. Wear tests were carried out using a pin-on-disc type machine using various input parameters like load, sliding distance, and sliding velocity with various SiC abrasive papers of grit size 80, 220, and 400, having an average particle size of 192, 102, and 45 μm. Neural networks are employed to study the tribological behavior of sintered Cu-SiC-Gr hybrid composites. Optical microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), and energy-dispersive spectral observations are used to evaluate the characteristics. The proposed neural network model used the measured parameters, namely, the weight percentage of graphite, abrasive size, sliding speed, load, and sliding distance, to predict the wear loss of the composite. In order to improve the accuracy and obtain better results, an artificial neural network (ANN) with a genetic algorithm (GA) function was used. Optimization of the training process of the ANN using a GA is performed and the results are compared with the ANN trained without a GA. The predicted values from the proposed networks coincide with the experimental values. © 2014 Copyright © Society of Tribologists and Lubrication Engineers.

Mohan Raj A.P.,The Rajaas Engineering College | Selvakumar N.,Mepco Schlenk Engineering College, Sivakasi | Narayanasamy R.,National Institute of Technology Tiruchirappalli | Kailasanathan C.,Sethu Institute of Technology
Materials and Design | Year: 2013

An experimental investigation on the workability and strain hardening behaviour of iron-carbon-manganese (Fe-C-0.50Mn) Powder metallurgy (P/M) steel composite sintered preforms under triaxial stress state has been carried out. Cold upset forming of the above composite preforms was conducted with variation in carbon content (0.10% and 0.25%) and manganese content (0.50% and 1.05%) with an aspect ratio 0.45. The powders were collected on weight basis and then gradually compacted up to 1.2. GPa pressure and then sintered at 950 ± 5. °C to form composite preforms. Sintered preforms were cold deformed with uniform incremental loading. The effect of different percentage of carbon and manganese on the iron-based P/M composite was investigated thoroughly in the cold deformation experiment. Comparison between the effect of carbon and manganese on the workability and strain hardening behaviour of the composites was analysed and presented. The analysis of the experimental results has shown that the P/M steel which contains 0.10% carbon and 0.50% manganese exhibited greater values of stresses, initial relative density, strain hardening and workability parameters. © 2013 Elsevier Ltd.

Sugirtha M.G.,The Rajaas Engineering College | Latha P.,Government of Tamilnadu
International Journal of Applied Engineering Research | Year: 2014

Wind energy conversion systems are normally located in the site where strong and dependable winds are available most of the time. But winds do not blow strongly enough to produce electricity all the time, power derived from wind energy is considered as intermittent only. Connecting induction generator based wind farm to the grid has an undesirable effect of reactive power absorption from grid, especially when wind velocity reduces. Reactive power management of grid connected windfarms is a major concern to maintain voltage stability of connected power system network. The purpose of this work is to analyse the reactive power compensation of grid connected wind farm under varying wind speed conditions. Field measurements were carried out in a 4.1 MW variable speed grid connected wind farm and the results give important indications about real effect of reactive power compensation under varying wind conditions. © Research India Publications.

Bibin C.,The Rajaas Engineering College | Seenikannan P.,Sethu Institute of Technology
Advanced Materials Research | Year: 2013

For many decades all major conservation bodies have realized the need to conserve our valuable fuel and power sources. The increased level of consumption of fuel and power results in carbon-di-oxide emissions to environment which results in the depletion of ozone layer leading to global warming. As a result, many ways of utilizing renewable fuel and power sources are developing with solar energy and waste heat recovery applications. Most of the process and industries have large capacity Diesel Generating (DG) set. The exhaust gas of such a DG set carries a lot of heat and it goes waste if it is not utilized properly. Energy recovery from engine exhaust is one of the energy saving methods in engines. By using energy recovery techniques, waste heat energy can be saved, emissions can be reduced and thermal efficiency of the engine is increased. This paper discusses about the exhaust gas energy recovery from engine exhaust using Rankine cycle and thermodynamic properties of the working fluids. The heat energy recovered from the engine exhaust can be utilized for various sources. © (2013) Trans Tech Publications, Switzerland.

Ezhilan M.,The Rajaas Engineering College | Kannan P.S.,Sethu Institute of Technology
Advanced Materials Research | Year: 2014

Micro channel heat exchangers (MCHX) can be broadly classified as fluidic devices that employ channels of hydraulic diameter smaller than 1 mm. The present study focused on validate the better configuration parameters of louver fin used in MCHX for apply in residential airconditioner condenser. The study has considered for three different louver angle case, two different louver lengths for better louver angle case and finally two different louver pitches for better louver angle and louver length case. The study indicates that the pressure drop will depends upon the louver angle and pitch. The louver angle i.e. 25deg provides reasonable pressure drop and high heat transfer rate. Thus by changing the length of louver can increase the pressure drop in MCHX. The case ie., 1.2mm louver length have more heat transfer rate. But when comparing to 1mm louver length case Net Heat Transfer rate is high. So the study further continued by having the louver length 1mm and changing the louver pitch. The louver pitch 0.8 and 1.2 has only considered for the study. The length of louver can decrease the pressure drop in MCHX. The variation of net heat transfer rate to changing the louver pitch indicating the importance of number of louver present in the MCHX. Thus the present study indicates the importance of configuration parameters for MCHX. The study also indicates that the increasing the louver length and angle will increase the net heat transfer rate. While increasing the louver pitch is inversely proportional to the net heat transfer rate of MCHX. ©(2014) Trans Tech Publications, Switzerland.

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