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

Mechanical

Reliable knowledge about flexural strength of sheet metals is very important for sheet metal bending process. Young's modulus and cross sectional area determine the flexural strength of sheet metals. For perforated sheet metals, the presence of holes reduces the cross sectional area and hence the flexural strength is affected. In this paper, an attempt is made to study the influence of presence of holes on flexural strength of Aluminium 8090 alloy sheets. Experiments are conducted to study the influence of hole size, percentage of open area and hole arrangement pattern. © 2006-2013 Asian Research Publishing Network (ARPN).

School of Mechanical Engineering

Chennai Campus

World University root node

Department of Manufacturing Engineering

Vellore Campus

ARPN Journal of Engineering and Applied Sciences

Influence of perforations on flexural strength of aluminium 8090 alloy sheets

Yield strength and ultimate tensile strength of a material are the important properties in sheet metal forming applications. These properties decide the plastic deformation and failure of sheet metals in sheet metal forming applications. In perforated sheet metal, these properties are affected by presence of holes. An attempt is made here to study the influence of open area and hole diameter on effective yield strength and effective ultimate tensile strength of aluminium 1050A sheets. © Research India Publications.

International Journal of Applied Engineering Research

Influence of hole on yield strength and ultimate strength of perforated aluminium 1050A sheets

Temperature in grinding is one of the major factors, affecting the quality of the ground surface. A review of thermal modelling approaches in grinding is presented. During grinding, heat is generated at the wheel-work interface. This problem can be likened to Jaeger's moving heat source, by analogy. The general solution of moving heat source problem by J.C. Jaeger is applied to the grinding process. Rectangular, triangular and parabolic laws of heat flux are tested to represent the grinding zone (a moving heat source) and the resulting temperature distributions are compared. Triangular heat source predicts the thermal profile with 10% error. The factors influencing the temperature for burn are identified by thermal modelling. A re-look at limiting temperature for burn incidence indicates that limiting value is higher than Ac1 temperature for steel. Modelling of the heat partition is helpful to assess alternate ways to control grinding temperature.

International Journal of Mechanical and Materials Engineering

Theoretical analysis of thermal profile and heat transfer in grinding

This article describes an application of an artificial neural network (ANN) model for predicting the performance, combustion and emission characteristics of a compression ignition engine using fish oil biodiesel. Experimental investigations are carried out in a single-cylinder constant speed direct injection diesel engine under variable load conditions. The performance, combustion and emission characteristics are measured using an exhaust gas analyzer, smoke meter, piezoelectric pressure transducer and crank angle encoder for different fuel blends and engine load conditions. The obtained data are recorded for each experiment and the associated data are used to train the simulation model using the back-propagation algorithm. The developed ANN model predicts the performance, combustion and exhaust emissions with a correlation coefficient (R) of 0.957-0.999 and a mean relative error of 0.02-3.97%. The root-mean-square errors were found to be low. The developed model has been found to predict the engine performance, combustion and emission parameters accurately for the range of data trained. © 2013 Taylor & Francis.

International Journal of Ambient Energy

Predicting the engine performance using ethyl ester of fish oil with the aid of artificial neural network

The ever increasing diesel consumption, rapid depletion of fossil fuels and environmental concern has prompted an intensive use of biodiesel produced from various sources. In this study, biodiesel (ethyl ester of fish oil) was prepared from fish oil and different blends of biodiesel-diesel (B20, B40, B60, B80 and B100) were examined in a single cylinder, constant speed, and direct injection engine under variable load conditions. On the basis of the engine performance and emission characteristics, B20 was found out to be the most favourable blend among all the blends. In addition, the test results showed a reduction of CO and HC and a marginal increase of NOx. Hence an attempt has been made to minimise NOx emission by adding little percentage (2%) of different additives such as methanol (M), ethanol (E), distilled water (DW) and diethyl ether (DEE) to the B20 blend. The results revealed that B20 blend along with distilled water produces the minimum NOx emission compared to other additives. Copyright © 2013 Inderscience Enterprises Ltd.

International Journal of Oil, Gas and Coal Technology

Effect of fuel additives on performance and exhaust emissions of direct injection diesel engine operating on B20 waste fish oil

This paper describes an application of hybrid multi criteria decision making (MCDM) technique for the selection of the best car. This study focuses on five alternatives and evaluation criteria such as safety, performance, economic aspect, exterior, convenience, dealer, warranty and emissions to select the best car. Two models are proposed to evaluate the best car. The first model, fuzzy analytical hierarchy process (FAHP) is integrated with Preference Ranking Organization METHod for Enrichment Evaluation (PROMETHEE) technique. The second model, FAHP is integrated with hierarchy grey relation analysis (GRA) technique. Here, the FAHP is used to analyse the structure of car selection problem and to determine the weights of the criteria. The hierarchical GRA and PROMETHEE techniques are used to obtain the final ranking of the cars. Copyright © 2013 Inderscience Enterprises Ltd.

International Journal of Information and Decision Sciences

A hybrid MCDM approach for evaluating an automobile purchase model

Because of its wide range of properties, usages of foam in various applications are enormous, which normally cannot be met by fully dense solids. The foam is considered as a periodic array of unit cells. The unit cell taken for the analysis is tetrakaidecahedron. The objective of the present work is to understand the micromechanics of foam deformation and prediction of elastic properties by numerical simulation using FEA software ABAQUS for closed cell foam. These properties are compared with those available in literature. Translation symmetry of the unit cell alone is sufficient to get the property of the entire foam. The periodic boundary conditions are imposed on the unit cell. The values obtained from the present analysis give better results since the periodicity is maintained. The Young's modulus and shear modulus are the increasing functions of relative density while the Poisson's ratio is a decreasing function.

Indian Journal of Science and Technology

Micro-mechanics of Foam using Unit Cell (Closed Cell) Approach

A novel composite coating containing WS2 in Ni-P matrix was obtained by electroless deposition route. The incorporation of tungsten sulfide particles enhanced the hardness and corrosion resistance of the Ni-P coatings. It was established that the electroless Ni-P-WS2 coatings were able to sustain the low coefficients of friction under severe sliding condition in comparison with the Ni-P coatings. It is evident that the Ni-P-WS2 coatings have the option of being used as solid lubricants to the sliding parts of machineries in aerospace industries. The incorporation of WS2 and the existence of Ni3P in the matrix have been ascertained by XRD, SEM and AFM. © 2013 The Authors. Published by Elsevier Ltd.

Department of Design and Automation

Department of Chemistry

School of Advanced Sciences

Fulltext

Procedia Engineering

Wear, Hardness and Corrosion Resistance Characteristics of Tungsten Sulfide Incorporated Electroless Ni-P Coatings

Spring-back is one of the key problems in sheet metal forming industry. It occurs from the elastic recovery during unloading. Spring-back analysis of sheet metals with perforations is carried out in this work. Performance of perforated sheet metals depend on percentage of open area, number of holes, ligament ratio, hole size, hole shape, arrangement of hole pattern and thickness. Among the above, the influences of open area, ligament ratio and thickness on spring-back are considered in this paper. Commercial pure Aluminium is considered for the purpose. Sheet metal V-bending process is modeled. Finite Element Method is used to study the same. It has been found that spring-back increases with open area and ligament ratio but it decreases with thickness. © Research India Publications.

FEM based spring-back investigations of perforated sheet metals: Influence of open area, ligament ratio and thickness

The present work is mainly focussed on studying the effect of electric pulse frequency and duty cycle on the structural, morphological and corrosion characteristics of micro arc oxidation (MAO) films developed for a fixed oxidation time of 2.5 min on Ti-6Al-4V biomedical implant material. For this purpose, the titania films are decisively developed under four different conditions arising from two levels of pulse duty cycle (10% and 75%) and frequencies (500 Hz and 1500 Hz). A phosphate based electrolyte system is employed for developing the titania films. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results demonstrated that though all the titania films are developed for the same oxidation time of 2.5 min, the rate of anatase to rutile phase transformation, the crystallite growth, the size and distribution of surface pores and film thickness of the titania film are strongly influenced by the electric pulse frequency and duty cycle. The potentiodynamic polarization (PDP) tests conducted under simulated body fluid (SBF) conditions (37 °C and 7.4 pH) showed that all the titania films could significantly improve the corrosion resistance of Ti-6Al-4V compared to that of the untreated alloy. Of all the titania films developed for the same oxidation time of 2.5 min, the one treated with 1500 Hz frequency and 75% duty cycle exhibited better corrosion resistance than those of the other films and the untreated Ti-6Al-4V implant material. © (2013) Trans Tech Publications, Switzerland.