Indian Journal of

Engineering & Materials Sciences

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VOLUME 17

NUMBER3

JUNE 2010

CODEN : IEMSEW

ISSN : 0971-4588

 

CONTENTS

 

Engineering

 

Influences of multiple holes on thermal stresses in a thermoplastic
composite disc

157

  Faruk Sen & Metin Sayer

 

 

 

Current-mode and transimpedance-mode universal biquadratic filter using multiple outputs CCIIs

169

  Jiun-Wei Horng

 

 

 

High input impedance first-order allpass, highpass and lowpass filters with grounded capacitor using single DVCC

175

††††††† Jiun-Wei Horng

 

 

 

Modeling slump of concrete using the group method data handling algorithm

179

††††††† Li Chen & Tai-Sheng Wang

 

 

 

Materials Science

 

Damage prediction in glass/epoxy laminates subjected to impact loading

186

    Ramazan Karakuzu, Emre Erbil & Mehmet Aktas

 

 

 

Influence of combined Al2O3-SiO2 filler on thermal and dielectric properties of

    barium zinc borate glass microcomposites for barrier ribs of plasma

    display panels

199

††††††† Mousumi Das, Shiv Prakash Singh, Karan Pal, Suchika Jena &

   Basudeb Karmakar

 

 

 

Low stress abrasive wear response of boron steel under three body abrasion:

  Effect of heat treatment and peening intensities

208

    Dushyant Singh, D P Mondal, O P Modi& V K Sethi

 

 

 

Effects of fiber content on abrasive wear of Lantana Camara fiber reinforced

  polymer matrix composite

219

††††††† Chittaranjan Deo & S K Acharya

 

 

 

Ferromagnetic amorphous carbon derived from low molecular weight organic compounds

224

††††††† Prabal Dasgupta & Bhola Nath Mondal

 

 

 

Study on solvatochromic behaviour of polyaniline and alkyl substituted

  polyanilines

231

  Shalini Sharma & D Kumar

 

 

 

 

 

 

AUTHOR INDEX

 

 


Acharya S K

219

Aktas Mehmet

186

 

 

Chen Li

179

 

 

Das Mousumi

199

DasguptaPrabal

224

Deo Chittaranjan

219

 

 

Erbil Emre

186

 

 

Horng Jiun-Wei

169, 175

 

 

Jena Suchika

199

 

 

Karakuzu Ramazan

186

Karmakar Basudeb

199

Kumar D

231

 

 

Modi O P

208

Mondal Bhola Nath

224

Mondal D P

208

 

 

Pal Karan

199

 

 

Sayer Metin

157

Sen Faruk

157

Sethi V K

208

Sharma Shalini

231

Singh Dushyant

208

Singh Shiv Prakash

199

 

 

Wang Tai-Sheng

179


 

 

Indian Journal of Engineering & Materials Sciences

Vol. 17, June 2010, pp. 157-168

 

 

 

 

 

Influences of multiple holes on thermal stresses in a thermoplastic composite disc

Faruk Sen & Metin Sayer c

 

The aim of this investigation is to observe the influence of multiple holes on thermal stresses in a thermoplastic composite hollow disc. For this purpose, a thermoplastic composite disc is reinforced by steel fibers as curvilinear for radial direction, and thermal loads are carried out for uniform distribution at various temperatures. The solution is completed in two parts that are elastic and elastic-plastic analysis. Additionally, residual stresses are calculated using these analysis results. Finite element method (FEM) is utilized for calculation of thermal stresses. Therefore, the thermal stress analysis is performed using ANSYS ® finite element software. Due to the fact that composite disc have different thermal expansions in radial and tangential directions, thermal stresses are taken place in disc by the applied uniform thermal loadings. The magnitude of the tangential stress components both elastic and elastic-plastic solutions is higher than that of the radial stress components, except edges of multiple holes. The present study concludes that magnitudes and distributions of thermal and residual stresses on the composite disc are considerably affected by increasing the uniform temperature loadings and existence of multiple holes.

Keywords: Thermoplastic disc, Multiple holes, Residual stresses, Thermal stresses, FEM

 

 

 

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 17, June 2010, pp. 169-174

 

 

 

 

Current-mode and transimpedance-mode universal biquadratic filter using multiple outputs CCIIs

Jiun-Wei Horng

 

A current-mode and transimpedance-mode universal biquadratic filter with single input and multi-outputs using three multiple outputs second-generation current conveyors (MOCCIIs), five resistors and two grounded capacitors is presented. The proposed circuit can realize current-mode notch, bandpass and lowpass responses, simultaneously. The current-mode highpass and allpass responses can be obtained by interconnection of relevant output currents. Moreover, the transimpedance-mode highpass, bandpass, lowpass, notch and allpass filters can also be obtained, simultaneously, from the proposed circuit.

 

Keywords : Current conveyor ; C urrent-mode filter ; T ransimpedance-mode filter

 

 

 

 

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 17, June 2009, pp. 175-178

 

 

High i nput i mpedance f irst- o rder allpass, highpass and lowpass f ilter s with g rounded c apacitor u sing single DVCC

 

Jiun-Wei Horng

 

A voltage-mode high input impedance first-order allpass, highpass and lowpass filters using one differential voltage current conveyor (DVCC), one grounded capacitor and two resistors is presented. The allpass, highpass and lowpass signals can be obtained simultaneously from the circuit configuration. The simulation results confirm the theoretical analysis.

Key w ords : C urrent conveyor, F irst- o rder , A llpass filter , Analog signal processing

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 17, June 2010, pp. 179-185

 

 

Modeling slump of concrete using the group method data handling algorithm

Li Chen & Tai-Sheng Wang

 

This paper proposes the group method data handling (GMDH) algorithm and applies it to estimate the slump of high-performance concrete (HPC). It is known that HPC is a highly complex material whose behaviour is difficult to model , especially for slump . To estimate t he slump , it is a nonlinear function of the content of all concrete ingredients, including cement, fly ash, blast furnace slag, water, superplasticizer, and coarse and fine aggregate. Therefore, s lump estimation is set as a function of the content of these seven concrete ingredients and additional four important ratios . T he GMDH algorithm presented in this paper has the advantage of a heuristic self-organized and gradually complicated model for the complicated multi-variable HPC slump estimation . The model establishes the input-output relationship of a complex system using a multilayered perception-type structure that is similar to a feed-forward multilayer artificial neural network (ANN) , but it expresses relationships using more explicit functions than ANN. Moreover, the GMDH has the ability to select significant variables and combine them properly and automatically. The results show that GMDH obtains a more accurate mathematical equation through learning procedures which outperforms the traditional multiple linear regression analysis (RA) and ANN, with lower estimating errors for predicting the HPC slump.

Keywords: Group method data handling, Slump, High-performance concrete, Regression analysis

 

 

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 17, June 2010, pp. 186-198

 

 

Damage prediction in glass/epoxy laminates subjected to impact loading

Ramazan Karakuzu, Emre Erbil & Mehmet Aktas

 

In this paper, the impact behaviour of glass/epoxy laminated composite plates with [0/±?/90] S fiber orientation is investigated numerically at equal energy (40 J), equal velocity (2 m/s) and equal impactor mass ( 5 kg ). In order to examine the stacking sequence effect, five different ±? fiber directions are chosen as 15°, 30°, 45°, 60° and 75°. Three different plate thicknesses as 2.9 mm , 5.8 mm , and 8.7 mm are also selected to survey the thickness effect on impact behaviour of glass/epoxy composite plates. The overlapped delamination area is obtained for composite plates with different stacking sequences and different thicknesses. A transient finite element code 3DIMPACT is used for numerical analyses. In this code an eight-point brick element and the direct Gauss quadrature integration scheme are used through the element thickness to account for the change in material properties from layer to layer. The Newmark scheme is also adopted to perform time integration step by step. In addition, a contact law incorporated with the Newton-Raphson method is applied to calculate the contact force during impact. Numerical results are compared with the experimental study and it has been seen that they are in good agreement with the experimental results.

Keywords:    Damage prediction, Low velocity impact, Glass/epoxy, Thickness effect, Stacking sequence effect, Delamination

 

Indian Journal of Engineering & Materials Sciences

Vol. 17, June 2010, pp. 199-207

 

 

Influence of combined Al 2 O 3 -SiO 2 filler on thermal and dielectric properties of barium zinc borate glass microcomposites for barrier ribs of plasma display panels

 

Mousumi Das, Shiv Prakash Singh, Karan Pal, Suchika Jena & Basudeb Karmakar

 

The co-effects of Al 2 O 3 -SiO 2 filler to an extent of 25 wt.% on thermal (softening point and coefficient of thermal expansion) and dielectric constant of lead free BaO-ZnO-B 2 O 3 -SiO 2 -Li 2 O-Na 2 O (BZBSLN) glasses have been explored with a view to use as barrier ribs of plasma display panels (PDPs). The interaction of fillers with glass occurred during firing (570 ° C) has also been investigated by XRD, SEM micrograph and FTIR spectroscopy analyses. The fillers have been found to be partially dissolved in the glass at the firing temperature leaving some unreacted residual filler which result in ceramic-glass microcomposites. All the properties are found to follow the same experimental and theoretical trends, and regulate by the covalent character as well as the optical basicity of microcomposites. Addition of combined filler found to be yielded the required properties and meeting the criteria for barrier rib application.

Keywords: Powders-solid state reaction, glass, composites, thermal properties, dielectric properties

 

 

 

 

Indian Journal of Engineering & Materials Sciences

Vol.17, June 2010, pp. 208-218

 

 

 

Low stress abrasive wear response of boron steel under three body abrasion: Effect of heat treatment and peening intensities

Dushyant Singh, D P Mondal, O P Modi & V K Sethi

 

The wear behaviour of medium carbon boron steel with various heat-treatment cycles (annealing, intercritical annealing, and quenching and tempering) has been examined after and prior to shot peening. Shot peening intensity varies in the range 0.17 - 0.47 mm ALMEN ĎA'. The wear rate of intercritical annealed and quenched and tempered steels are considerably less than those of as-received and annealed steels, irrespective of the peening intensity. It is further noted that the wear rate reduced significantly irrespective of heat-treatment schedule at the critical peening intensity of 0.27 A, mm ALMEN.

Keywords: Heat treatment cycle, Shot peening, Shot peening intensity, Abrasive wear, Boron steel

 

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 17, June 2010, pp. 219-223

 

 

 

Effects of fiber content on abrasive wear of Lantana Camara fiber reinforced polymer matrix composite

 

Chittaranjan Deo & S K Acharya

 

This work aims to present a study on abrasive wear behaviour of locally available Lantana-Camara fiber (LCF), reinforced in epoxy matrix. Wear tests are carried out in dry conditions on a pin-on-disc machine against 400 grit size abrasive paper with test speed of 0.314 m/s and normal load 5, 10, 15, 20 and 25 N. The effects of fiber content on abrasive wear properties of composites are investigated. The results show that the incorporation of LCF into epoxy improves the abrasive wear behaviour considerably. The optimum wear reduction is obtained when fiber content is 40 wt%. It is observed that abrasive wear loss increases with increase of normal load. The worn surface morphologies are examined by SEM and possible wear mechanism has been discussed.

Keywords: Lantana-Camara fiber, Weight fraction, Pin-on-disc machine Abrasive wear, Scanning electron microscope

 

 

 

 

 

 

 

 

 

 

Indian Journal of Engineering & Materials Sciences

Vol.17, June 2010, pp. 224-230

 

Ferromagnetic amorphous carbon derived from low molecular
weight organic compounds

Prabal Dasgupta & Bhola Nath Mondal

 

Recently ferromagnetic signals have been observed in host of carbonaceous materials. In this paper, we report that the simple combustion products of low-molecular weight aromatic compounds like toluene and naphthalene clearly show ferromagnetic signals at 300 and 10 K with coercivity as low as » -70 Oe and -100 Oe at 300 K and 10 K respectively and saturation magnetization as high as 5.1 × 10 -4 and 5.5 × 10 -4 emu at 300 K for toluene and naphthalene carbon respectively. These materials have been found to be air-stable at room temperature and they do not strictly obey Curie-Weiss law. The combustion products were characterized with the aid of Magnetometric studies, FTIR, SEM and TEM. Atomic absorption spectrophotometric analysis reveals that among ferro/ferrimagnetic contaminants, only iron is present in such a low concentration that it cannot account for a saturation magnetization as high as 5.5 × 10 -4 emu. Hence, the origin of ferromagnetism is partly intrinsic in nature.

 

 

 

Indian Journal of Engineering & Materials Sciences

Vol. 17, June 2010, pp. 231-237

 

 

 

Study on solvatochromic behaviour of polyaniline and alkyl substituted polyanilines

Shalini Sharma & D Kumar

 

The polyaniline and alkyl substituted polyanilines have been synthesized by chemical polymerization method and then characterized by using UV-visible spectrophotometer in different solvents such as propionic acid, acetic acid, formic acid and N-methyl-2-pyrrolidone. UV-visible data reveal that the nature (blue or red shift) and amount (i.e., strong or weak) of the shifts of polyanilines depends on the solvents used and the presence of alkyl substituents. The solvatochromic behaviour of these polymers has been studied in different solvents in order to explain all the shifts qualitatively. A comparative energy diagram is also presented to show the effect of the solvents on conducting polymers giving mainly two transitions, i.e., p - p * and n - p *. The band gap values have been calculated for all these conducting polymers by Tauc's method and these band gap values are found in the range 2.38-3.16 eV. The significance of present study evolves a trend in solvatochromic shifts of polyaniline and alkyl substituted polyanilines in different solvents.

Keywords : Conducting polymer, Polyanilines, Solvatochromic shift, Band gap