Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya

www.kanchiuniv.ac.in
Kanchipuram, India

Sri Chandrasekarendra Saraswathi Viswa Maha Vidyalaya is a university at Kancheepuram in Tamil Nadu, India. The university was established with the blessing of Their Holiness Pujyasri Jayendra Saraswathi Swamigal and Pujyasri Sankara Vijayendra Saraswati Swamigal . It attained the status of Deemed University in 1993.The Ministry of Human Resources Development declared the institution a 'Deemed University' under Section 3 of the UGC Act, on 26.05.1993. Wikipedia.

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Rajmohan T.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Palanikumar K.,Sri Sai Ram Institute of Technology | Prakash S.,Sathyabama University
Composites Part B: Engineering | Year: 2013

Metal matrix composites (MMCs) are difficult to machine due to their abrasive properties. With the projected widespread application of MMCs, it is necessary to develop an appropriate technology for their effective machining. The present investigation focuses on finding the optimal machining parameters setting in drilling of hybrid aluminium metal matrix composites using the grey-fuzzy algorithm. This proposed algorithm, coupling the grey relational analysis with the fuzzy logic, obtains a grey-fuzzy reasoning grade to evaluate the multiple performance characteristics according to the grey relational coefficient of each performance characteristics. The Taguchi method of experimental design is a widely accepted technique used for producing high quality products at low cost, therefore a L27 3-level orthogonal array is used for the experiments. The optimisation of multiple responses in complex processes is common; therefore, to reduce the degree of uncertainty during the decision making, fuzzy rule-based reasoning is integrated with the Taguchi's method. The response table, response graph and analysis of variance (ANOVA) are used to find the optimal setting and the influence of machining parameters on the multiple performance characteristics. Experimental results have shown that the required performance characteristics in the drilling process are improved by using this approach. © 2013 Elsevier Ltd. All rights reserved.


Rajmohan T.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Palanikumar K.,Sri Sai Ram Institute of Technology
Measurement: Journal of the International Measurement Confederation | Year: 2013

In this study, the application of response surface methodology (RSM) and central composite design (CCD) for modeling, optimization, and an analysis of the influences of dominant machining parameters on thrust force, surface roughness and burr height in the drilling of hybrid metal matrix composites produced through stir casting route. Experiments are carried out using Al 356-aluminum alloy reinforced with silicon carbide of size 25 μm and Mica of size 45 μm. Drilling test is carried out using carbide drill of 6 mm diameter. The design of experiment concept has been used to optimize the experimental conditions. The experimental data are collected based on a three-factor-three-level full central composite design. The multiple regression analysis using RSM is used to establish the input-output relationships of the process. The mathematical models are developed and tested for adequacy using analysis of variance and other adequacy measures using the developed models. The main and interaction effect of the input variables on the predicted responses are investigated. The predicted values and measured values are fairly close, which indicate that the developed models can be effectively used to predict the responses in the drilling of hybrid metal matrix composites. The optimized drilling process parameters have been obtained by numerical optimization using RSM by ensuring the minimum thrust force of 84 N, surface roughness of 1.67 μm, and the burr height of 0.16 mm. After the drilling experiments, a scanning electron microscope (SEM) is used to investigate the machined surface and tool wear.


Padmanaban R.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Venkatramanan K.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya
AIP Conference Proceedings | Year: 2015

Polymer is a macromolecule, composed of many repeated subunits. Polystyrene is a polymer of styrene. Polystyrene has very low impact strength. Polystyrene generally leads to lower tensile strength, crystal grades being stiff and brittle. It is used to construct clamshell packs, cookie trays, cups, forks, spoons, cushioning materials for packaging, disposable medical devices, egg cartons, fast food containers, lids, lunch boxes, meat trays and also used in civil construction (concrete form-work or weight reduction on foundations). In the present study an attempt has been made to compute the viscosity of Polystyrene (PS 35000) in toluene and benzene in different concentrations (0.5%, 1.0%, 1.5%, 2.0% & 2.5%) at different temperatures (303 K, 308 K, 313 K & 318 K). From these experimental data the activation energy is calculated and the effect of solvent is analysed. © 2015 AIP Publishing LLC.


Narayanamoorthy B.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Datta K.K.R.,Jawaharlal Nehru Centre for Advanced Scientific Research | Eswaramoorthy M.,Jawaharlal Nehru Centre for Advanced Scientific Research | Balaji S.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya
ACS Applied Materials and Interfaces | Year: 2012

A novel Pt nanoparticle (Pt NP) embedded aminoclay/Nafion (Pt/AC/N) nanocomposite catalyst film was prepared for oxygen reduction reaction by sol-gel method. The prepared nanocomposite films were surface characterized using XRD and TEM and thermal stability was studied by TGA. The prepared film has firmly bound Pt NP and could exhibit an improved electro-reduction activity compared to vulcan carbon/Nafion supported Pt NP (Pt/VC/N). Moreover, the Pt/AC/N film possessed good stability in the acidic environment. The limiting current density of the Pt/AC/N film with 35.4 μg/cm 2 of Pt loading was found to be 4.2 mA/cm 2, which is 30% higher than that of the Pt/VC/N. The maximum H 2O 2 intermediate formation was found to be ∼1.6% and the reaction found to follow a four electron transfer mechanism. Accelerated durability test for 2000 potential cycles showed that ca. 78% of initial limiting current was retained. The results are encouraging for possible use of the Pt/AC/N as the free-standing electrocatalyst layer for polymer electrolyte membrane fuel cells. © 2012 American Chemical Society.


Narayanamoorthy B.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Datta K.K.R.,Jawaharlal Nehru Centre for Advanced Scientific Research | Balaji S.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya
Journal of Colloid and Interface Science | Year: 2012

This work demonstrates the use of amino functionalized Mg-phyllosilicate clay/Nafion nanocomposite film embedded with Pt nanoparticles (Pt/AC/N) for catalyzing oxygen reduction reaction (ORR) in sulphuric acid medium. Pt/AC/N nanocomposite films were surface characterized using transmission electron microscope. Cyclic and linear scan voltammetry studies were carried out under hydrodynamic conditions taking rotating-ring disc electrode (RRDE) as the working electrode. The effects of clay content, Pt mass loading, electrode rotation rate, and temperature on the ORR kinetics were studied. The Tafel slopes were found to vary between 118 and 126mVdec -1 indicating a good ORR kinetics. The exchange current density values calculated after mass transfer correction ranged from 5.8×10 -7 to 2.4×10 -6Acm -2. From the RRDE disc currents, Koutecky-Levich plots were constructed and the ORR mechanism was found to follow a four electron path with minimum H 2O 2 formation of ∼1.6%. The effect of temperature on ORR kinetics was found at 25, 40, and 50°C. The energy of activation calculated to be 7.68kJmol -1 and comparable to the standard Pt/C catalyzed ORR systems. © 2012 Elsevier Inc.


Muthu S.,Sri Venkateswara College of Engineering | Uma Maheswari J.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2012

The Fourier transform infrared (FT-IR) and FT-Raman of 4-[(4-aminobenzene) sulfonyl] aniline have been recorded and analyzed. The equilibrium geometry, harmonic vibrational frequencies have been investigated with the help of HF and DFT methods with 6-31G(d,p) as basis set. A detailed interpretation of the vibrational spectra of this compound has been made on the basis of the calculated potential energy distribution (PED). The 1H and 13C nuclear magnetic resonance (NMR) chemical shifts of the molecule were calculated by GIAO method. Stability of the molecule arising from hyper conjugative interactions, charge delocalization has been analyzed using natural bond orbital (NBO) analysis. The linear polarizability (α) and the first order hyperpolarizability (β) values of the investigated molecule have been computed using DFT quantum mechanical calculations. UV-vis spectrum of the compound was recorded and electronic properties, such as HOMO and LUMO energies were also performed. Finally the calculations results were applied to simulated infrared and Raman spectra of the title compound which show good agreement with observed spectra. © 2012 Elsevier B.V. All rights reserved.


Rajmohan T.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Palanikumar K.,Sri Sairam Institute of Technology
Materials and Manufacturing Processes | Year: 2011

Hybrid metal matrix composites (MMCs) find diversified applications in many engineering fields and are very important in the recent development of material science. The present article investigates the effect of thrust force in the drilling of hybrid MMCs using coated carbide drills. Materials used for the present investigation are Al 356-aluminum alloy reinforced with silicon carbide of size 25 microns and mica of an average size 45 microns, which are produced through stir casting route. Experiments are conducted on a vertical machining centre using the central composite design technique. A model is developed to correlate the drilling parameters with thrust force using response surface methodology (RSM). The results indicate that the developed model is suitable for prediction of thrust forces in drilling of hybrid MMCs. Analysis of the drilled surface of Al356/SiC-Mica composites was done using scanning electron microscope (SEM). The influence of different parameters on thrust force of Al356/SiC-Mica composites has been analyzed through contour graphs and three-dimensional (3D) plots. © 2011 Taylor & Francis Group, LLC.


Arumugam S.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Sriram G.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya
Tribology Transactions | Year: 2013

This study compared the tribological evaluation of chemically modified rapeseed oil as a potential biodegradable automotive lubricant with and without nano- and microscale titanium dioxide (TiO2) particles, focusing on the influence of TiO2 particles to improve the friction reduction and antiwear characteristics of chemically modified rapeseed oil. TiO2 nano- and microscale particles of anatase phase and rutile phase were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Further, the analysis of chemically modified rapeseed oil with and without TiO2 additives was carried out to determine its tribological behavior using a pin-on-disc tribometer. The experimental results showed that the addition of TiO2 nanoparticles exhibited good friction reduction and antiwear properties compared with the addition of microscale TiO2 and without TiO2 additives to chemically modified rapeseed oil. Nanoscale TiO2 is suitable as an antiwear additive in chemically modified rapeseed oil. © 2013 Copyright Taylor and Francis Group, LLC.


Arumugam S.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Sriram G.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology | Year: 2013

The primary efforts of this study have been focused on formulating environmental-friendly lubricant with good oxidative stability and improved cold flow behaviour. Rapeseed oil was chemically modified via, epoxidation, hydroxylation followed by esterification process. The formation of epoxide and hydroxyl group was confirmed by Fourier transform infrared spectral analysis. The present work also addresses the issue of friction and wear characteristics of diesel engine cylinder liner-piston ring combination under diesel-contaminated chemically modified rapeseed oil bio-lubricant and diesel-contaminated commercial synthetic lubricant (SAE20W40) using a high frequency reciprocating tribometer test rig. In addition, the investigations were performed using scanning electron microscopy to interpret the possible mechanisms of wear with chemically modified bio-lubricant. The chemically modified rapeseed oil bio-lubricant exhibits good oxidative stability, improved cold flow property and better performance in terms of frictional force and co-efficient of friction. © IMechE 2012.


Rajmohan T.,Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya | Palanikumar K.,Sri Sairam Institute of Technology
Materials and Manufacturing Processes | Year: 2012

This article focuses on the multiple performance analysis in machining characteristics of drilling hybrid metal matrix composites produced through stir casting route. The desirability function-based approach is employed for the optimization of drilling parameters, namely, spindle speed, feed rate, and wt% of SiC based on the multiple performance characteristics including surface roughness and burr height. Material used for the present investigation is Al 356-aluminum alloy reinforced with silicon carbide of size 25 microns and mica of an average size of 45 microns. Experiments are conducted on a vertical machining center using the Box - Behnken experimental design (BBD) technique. The drilling test is carried out using coated carbide drill of 6mm diameter. An empirical model has been developed for predicting the surface roughness and burr height in drilling of Al 356/SiC-mica composites. The optimization results showed that the combination of medium spindle speed, low feed rate, and high wt% of SiC is necessary to minimize burr height and surface roughness in drilling hybrid composites. © 2012 Copyright Taylor and Francis Group, LLC.

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