Madha Engineering College

Chennai, India

Madha Engineering College

Chennai, India
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Baradeswaran A.,Madha Engineering College | Elaya Perumal A.,Anna University | Selvakumar N.,Mepco Schlenk Engineering College, Sivakasi | Franklin Issac R.,Madha Engineering College
Materials and Design | Year: 2014

Aluminium alloy (AA) 6061 and 7075 were reinforced with 10wt.% of boron carbide (B4C) and 5wt.% of graphite through liquid casting technique. The Scanning Electron Microscope (SEM) and Energy Dispersive Spectrum (EDS) were used for the characterization of composites. The wear experiment was carried out by using a pin-on-disc apparatus with various input parameters like applied load (10, 20, and 30N), sliding speed (0.6, 0.8, and 1.0m/s) and sliding distance (1000, 1500, and 2000m). Response Surface Methodology (RSM) using MINITAB 14 software was used to analyse the wear rate of hybrid composites and aluminium alloys. The worn surfaces of hybrid composites and base alloys were studied through SEM and EDS systems and some useful conclusions were made. © 2014 Elsevier Ltd.


Saravanan I.,Anna University | Elaya Perumal A.,Anna University | Selvakumar N.,Mepco Schlenk Engineering College, Sivakasi | Baradeswaran A.,Madha Engineering College
Materials and Design | Year: 2015

Titanium nitride (TiN) is a hard ceramic biocompatible material, which is deposited over stainless steel (SS) 316L to improve the mechanical and wear properties when sliding against Ti-6Al-4V alloy for artificial hip joints. Arc deposited TiN coating thickness was measured, using an optical microscope. The surface hardness of the TiN coated surface has been improved 9 times more than that of the uncoated steel surface. The crystallography of the coated surface was examined by the X-ray diffraction analysis, and the topography of the coated surface was inspected, using the Atomic Force Microscope. The wear test was conducted, using the ball-on-disc, with the varying parameters of the applied load (2-6. N), sliding velocity (0.25-0.75. m/s) and sliding distance (500-1500. m). The Worn surface of the coated and uncoated sample was studied, using the Field Emission Scanning Electron Microscope. It was concluded that the presence of TiN coating on the SS 316L surface exhibits superior wear resistance and coefficient of friction. The optimum parameters of wear and friction were identified, using Response Surface Methodology, and some useful conclusions were made. © 2014 Elsevier Ltd.


Jayaprakash S.,Sathyabama University | Ramakrishnan V.,Madha Engineering College
Applied Mechanics and Materials | Year: 2014

This paper presents a Hardware implementation of single-stage solar based DC-DC converter for inductive load application. Solar model is connected in the input side. The circuit has two full wave converter connected to boost the voltage and also for the power factor correction. Switch-utilization factor is improved by using two active switches to serve in the PFC circuits. Controlled converter is used to load side along with pi filter. Finally inductive load is connected to output side. In the hardware circuit solar panel output voltage, transformer primary, secondary voltage and load voltage is measured. In the circuit used with all the component parameters to operate at zero-voltage switching which retains the high circuit efficiency. A circuit is designed for an 80v dc output and tested. © (2014) Trans Tech Publications, Switzerland.


Jayaprakash S.,Sathyabama University | Ramakrishnan V.,Madha Engineering College
2014 International Conference on Advances in Electrical Engineering, ICAEE 2014 | Year: 2014

This paper presents a Solar based DC-DC converter for armature voltage controlled separately excited motor. The circuit has two full wave converter connected to boost the voltage and also for the power factor correction (PFC) converters. That the two full wave converter is controlled by MOSFET. Output side of Controlled converter is connected to pi filter. Finally separately excited motor is connected to output side. Controlled voltage is applied to the armature of the motor. Speed of motor, Torque and Armature current are measured by experimental. The circuit with all the component parameters operate at zero-voltage switching which retains the high circuit efficiency. A circuit operation and simulation designed for a 220v dc output arrived and tested. © 2014 IEEE.


Tamilarasan K.,Madha Engineering College | Dharmendira Kumar M.,Anna University
Biocatalysis and Agricultural Biotechnology | Year: 2012

Solvent tolerant extracellular lipase from Bacillus sphaericus MTCC 7542 was purified by DEAE-Sepharose anion exchange chromatography. This purification resulted in 377U/mg specific activity and 17.33-fold with 5.7% recovery obtained. The molecular weight of the purified lipase was determined to be 69kDa using SDS polyacrylamide gel electrophoresis and conformed by zymogram. The purified lipase showed optimal activity and stability at pH 8.0 and 40°C. The purified lipase was stable in the presence of hydrophobic solvents like n-butanol, benzene, hexane and toluene. Lipase activity was promoted in the presence of Mg 2+, Ca 2+, Cu 2+, K + and Tween 80. © 2012 Elsevier Ltd.


Baradeswaran A.,Madha Engineering College | Elayaperumal A.,Anna University | Franklin Issac R.,Madha Engineering College
Procedia Engineering | Year: 2013

This work deals with the effect of Al2O3 on wear properties of AA7075 metal matrix composite and the results were optimized by Taguchi technique. The composites were prepared by conventional liquid casting method with varying the Al2O3 content. The wear test was conducted with pin-on-disc apparatus with the controlling parameters were, applied load of 10, 20, 30, and 40N and sliding distance of 1200 m with regular interval of 200m at 0.6m/s sliding speed. The micro structural investigation on the worn surfaces was performed by Scanning Electron Microscope. A statistical analysis of wear test was conducted using Response Surface Methodology, and Taguchi technique under Design of Experiments with Regression Equation using MINITAB software. From these results, the optimum AA7075/ Al2O 3 composite was evaluated and the optimum controlling parameters were examined on the basis of 'smaller the best'. © 2013 The Authors. Published by Elsevier Ltd.


Baradeswaran A.,Anna University | Baradeswaran A.,Madha Engineering College | Elaya Perumal A.,Anna University
Composites Part B: Engineering | Year: 2014

This work investigated the influence of graphite on the wear behavior of Al 7075/Al2O3/5 wt.% graphite hybrid composite. The investigation reveals the effectiveness of incorporation of graphite in the composite for gaining wear reduction. The Al 7075 (aluminium alloy 7075) reinforced with Al2O3-graphite were investigated. The composites were fabricated using liquid metallurgy route. Ceramic particles along with solid lubricating materials were incorporated into aluminium alloy matrix to accomplish reduction in both wear resistance and coefficient of friction. The Al 7075/Al2O3/graphite hybrid composite was prepared with 5 wt.% graphite particles addition and 2, 4, 6 and 8 wt.% of Al2O3. The hardness, tensile strength, flexural strength and compression strength of the Al 7075-Al2O3-graphite hybrid composites are found to be increased by increased weight percentage of ceramic phase. The wear properties of the hybrid composites containing graphite exhibited the superior wear-resistance properties. © 2013 Elsevier Ltd. All rights reserved.


Baradeswaran A.,Madha Engineering College | Elaya Perumal A.,Anna University
Tribology Transactions | Year: 2015

The influence of graphite particulates on the dry sliding wear behavior of aluminum alloy 7075 (AA7075)–graphite composites has been evaluated using a pin-on-disc apparatus. The materials were fabricated by a liquid casting technique. Composites with 5–20 wt% graphite particles were processed. The casted composites were subjected to T6 heat treatment. The effect of sliding speed and sliding distance has been studied under dry sliding conditions. The hardness of the composites is measured using a Brinell hardness tester and their tensile strength is measured using a universal testing machine. The wear rate of the composites reduced with the addition of graphite content and reached a minimum with 5 wt% graphite content. The coefficient of friction is decreased with the addition of graphite content and reached a minimum at 5 wt% graphite. The effect of graphite on hardness and tensile strength is also studied. The worn surfaces of the pin specimen are analyzed with scanning electron microscopy. The 7075 aluminum alloy exhibited its potential to act effectively as a self-lubricating material under dry sliding conditions in the lower range of graphite content, and 5 wt% graphite appeared to be optimum. © 2015, Copyright © Society of Tribologists and Lubrication Engineers.


Babu V.R.,Salem College | Koushik C.V.,Salem College | Lakshmikantha C.B.,Madha Engineering College | Subramaniam V.,Jaya Engineering College
Indian Journal of Fibre and Textile Research | Year: 2011

A technique based on electrical open and closed circuit principle has been used to measure the vertical capillary height of the liquid in the fabric as the function of time. Vertical wicking height for different types of fabrics with different yarn counts and fabric densities is observed. It is found that the yarn count and fabric density influence the wicking behavior of the fabrics.


Baradeswaran A.,Madha Engineering College | Elayaperumal A.,Madha Engineering College
Journal of the Balkan Tribological Association | Year: 2013

In this work, mechanical and tribological behaviour of AA7075/Al 2O3/graphite hybrid composite was studied. Pin-on-disc machine was used for the conductance of the wear test. The composites with 2-8 wt.% Al2O3 particles were processed by conventional liquid casting method. For the hybrid composite, 5 wt.% graphite were commonly added to the base alloy. The hardness of the composites was measured using a Vickers hardness tester and their tensile strength was measured by an universal testing machine (UTM). Scanning electron microscopy (SEM) was used to analyse worn surfaces of samples. It was found that an increase in Al2O 3 content reduced the coefficient of friction up to 6 wt.% and thereon slightly increased. But this effect was reverse in hybrid composites and AA 7075 / Graphite composites. Hardness and tensile strength of composites increased with increasing Al2O3 content in both cases. The wear rates for both composites and hybrid composites were dependent on Al 2O3 content in the alloy. Al/Al2O3 composites containing 6 wt.% Al2O3 exhibited superior wear properties over the base alloy, and hybrid composites.

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