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VOLUME 16
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NUMBER 1
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FEBRUARY 2009
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CODEN
: IEMSEW |
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ISSN : 0971-4588 |
CONTENTS
Engineering
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Investigation on the
characteristics of a new high frequency three-way proportional pressure
reducing valve in variable valve system of automobile engine |
7 |
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Jin-rong
Liu, Bo Jin, Ying-jun Xie, Ying Chen & Zhen-tao Weng
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Experimental study of recirculating flows induced by
vane swirler |
14 |
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Optimizing feed and radial
forces in CNC machining of P-20 tool steel through Taguchi’s parameter design
approach |
23 |
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Failure analysis of a spring for a fuel pump bracket
assembly |
33 |
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Static analysis of thick skew laminated composite
plate with elliptical cutout |
37 |
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Materials Science |
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Optimization of high speed
turning parameters of superalloy Inconel 718
material using Taguchi technique |
44 |
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Process and die design for square tube extrusion |
51 |
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Tailoring of density in carbon foams |
56 |
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S C
Sharma, N K Ramakrishna Naidu, T
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Relationship between
thermal stability and molecular structure of polynitro arenes |
61 |
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Indian
Journal of Engineering & Materials Sciences
Vol.
16, February 2009, pp. 7-13
Investigation on the characteristics of a new high frequency three-way
proportional pressure reducing valve in variable valve system
of automobile engine
Jin-rong Liu, Bo Jin, Ying-jun Xie, Ying Chen & Zhen-tao Weng
In this study, a new high frequency three way proportional
pressure-reducing valve has been developed. By reducing the turns of the coil
and using a high speed current amplifier, the responding time of the
proportional solenoid is reduced to less than 1 ms. The steady and dynamic
analyses show that the output pressure is proportional to the coil current and
the dynamic bandwidth can be increased by increasing the coil current. An
experimental system is built up and results well agreed with the theoretical
and simulation analyses. The bandwidth of the valve is about 130 Hz at -3dB,
which can meet the demand of automobile engine with
maximum speed of 3000 rpm.
Keywords: High frequency, Proportional pressure reducing valve, Variable valve, Proportional amplifier, Simulation
Indian
Journal of Engineering & Materials Sciences
Vol.
16, February 2009, pp. 14-22
Experimental study of recirculating flows induced by vane
swirler
R Thundil Karuppa Raj & V Ganesan
The core objective of this study is to present the details of
the experimental procedure and measurements made in an axisymmetric swirler
model. The flow through 8 blade 30° vane swirler is studied experimentally. An overlap
angle of 30°
is provided between the vanes for the proper guidance of the flow through
swirler. A hemi spherical bluff body is attached to the hub in order to
overcome the inlet flow field distortion. A
Keywords: Swirler, Adverse pressure gradient, Vane angle,
Recirculation region, Five-hole probe.
Indian
Journal of Engineering & Materials Sciences
Vol.
16, February 2009, pp. 23-32
Optimizing feed and radial forces in CNC machining of P-20 tool steel through Taguchi’s parameter design approach
Aman Aggarwal, Hari Singh, Pradeep Kumar & Manmohan Singh
The objective of the paper is to obtain an optimal setting of CNC machining process parameters (cutting speed, feed rate, depth of cut, nose radius and cutting environment) resulting in optimal values of the feed and radial forces while machining P-20 tool steel with TiN coated tungsten carbide inserts. The effects of the selected process parameters on the chosen characteristics and the subsequent optimal settings of the parameters have been accomplished using Taguchi’s parameter design approach. The analysis of the results shows that the optimal settings for low values of feed and radial forces are high cutting speed, low feed rate and depth of cut, small nose radius and cryogenic cutting environment.
Keywords: Cutting parameters, CNC machining process, Feed
force, Radial force, Taguchi approach, P-20 tool steel, Coated carbide inserts
Indian
Journal of Engineering & Materials Sciences
Vol. 16, February 2009, pp. 33-36
Failure analysis of a spring for a fuel pump bracket assembly
Himadri Roy, Debashis Ghosh, Tapas Sahoo & Awadhesh Shukla
This investigation is primarily aimed to examine the premature failure of a spring used in a fuel pump bracket assembly. Preliminary visual examinations along with detailed SEM studies are made on the damaged surface and fracture surface of the failed spring. In addition, microstructural investigations along with hardness measurements are carried out to understand the reason for the premature failure. Finally, it is concluded that improper heat treatment of the spring material is responsible for failure.
Keywords: Spring, SEM, Pearlite, Delamination, Failure
Indian Journal of Engineering
& Materials Sciences
Vol. 16, February
2009, pp. 37-43
Static analysis of thick skew laminated composite
plate with elliptical cutout
M S R Niranjan Kumar, M M M Sarcar & V Bala Krishna
Murthy
The behaviour of a laminated
composite skew plate with elliptical hole subjected to transverse pressure
loading has been investigated in the present analysis. A finite element method
which works on the basis of three-dimensional theory of elasticity is employed
to evaluate the transverse deflection, in-plane stresses and interlaminar
stresses. The results obtained by varying the skew angle, size of the cutout
and the effect of elliptical cutout orientation are discussed. The magnitudes
of the transverse deflection and in-plane stresses for pressure loading are
observed to be less at higher skew angles and for larger size of the cutout. It is also observed that the configuration 3
of the ellipse (major axis of the ellipse parallel to inclined sides of the
skew plate) is found to be better with respect to the major stresses point of
view. The solutions of skew
structures considered in the present analysis may be useful for the
construction of safe and efficient structures like skew bridges and swept wings
of aircraft structures.
Keywords: FEM, Skew laminate, Cutout, Interlaminar stresses
Indian
Journal of Engineering & Materials Sciences
Vol.
16, February 2009, pp. 44-50
Optimization of high speed turning parameters of superalloy Inconel
718 material using Taguchi technique
Dinesh Thakur, B Ramamoorthy & L Vijayaraghavan
Superalloy, Inconel 718 is widely used in sophisticated applications due to its unique properties desired for the engineering applications. Due to its peculiar characteristics machining of Superalloy Inconel 718 is difficult and costly. The present work is an attempt to make use of Taguchi optimization technique to optimize cutting parameters during high speed turning of Inconel 718 using tungsten carbide cutting tool. Taguchi method is a powerful design of experiments (DOE) tool for engineering optimization of a process. It is an important tool to identify the critical parameters and predict optimal settings for each process parameter. Analysis of variance (ANOVA) is used to study the effect of process parameters and establish correlation among the cutting speed, feed and depth of cut with respect to the major machinability factor, cutting forces such as cutting force and feed force. Validations of the modeled equations are proved to be well within the agreement with the experimental data.
Keywords:
Cutting force, Feed force, Chip
analysis, Taguchi method
Indian
Journal of Engineering & Materials Sciences
Vol. 16, February 2009, pp. 51-55
Process and die design for square tube extrusion
K K Pathak,
In this study, die profile of the square tube extrusion process is optimized to produce microstructuarlly sound product at maximum production speed and minimum left out material in the die. The design problem is formulated as a nonlinear programming model, which is solved using genetic algorithms (GA). Selection of the processing parameters is carried out using dynamic material modeling (DMM). Using this approach a square tube extrusion process is successfully designed.
Keywords: Microstructure; Die profile; Simulation, Processing
parameters; Extrusion; Genetic algorithms
Indian
Journal of Engineering & Materials Sciences
Vol.
16, February 2009, pp. 56-60
Tailoring of density in carbon foams
S C Sharma, N K Ramakrishna Naidu, T S Lakshmanan, M C Mittal, P P Sinha & V K Vaidyan
Cell-size of the sacrificial polymeric scaffolding and concentration of the impregnating phenolic resin are taken as two variables for tailoring density in the carbon foam. Effects of cell-size and resin-concentration on density of carbon foam are studied under three categories: (i) individual effect of varying cell-size with fixed resin-concentration, (ii) individual effect of varying resin-concentration with fixed cell-size, and (iii) synergistic effect of varying cell-size and resin-concentration. For a fixed resin-concentration and particularly for lower concentration of 10%, density marks a small incremental effect with the reduction in cell-size. It increases from 0.041 to 0.055 g/cc for a cell-size of 30 PPI (pores per inch) and 80 PPI respectively. For a fixed cell-size and particularly for lower cell-size of 80 PPI, density shows a large incremental effect with increase in resin-concentration. Density increases from 0.055 to 0.210 g/cc for a resin-concentration of 10% and 90% respectively. Under the combined effect of decreasing cell-size and increasing resin-concentration, density records a massive increase of 412.2% from initial combination of 30 PPI cell-size and 10% resin-concentration to last combination of 80 PPI cell-size and 90% resin-concentration.
Indian
Journal of Engineering & Materials Sciences
Vol.
16, February 2009, pp. 61-64
Relationship between thermal stability and molecular structure of polynitro arenes
M H Keshavarz, H R Pouretedal & A Semnani
A simple relationship has been
derived to predict thermal stability of CHNO polynitro arenes on the basis of
onsets of thermal decomposition, which can be obtained by means of
non-isothermal differential thermal analysis (DTA). The model is optimized
using a set of 12 polynitro arenes so that R-squared
value or the coefficient of determination of the new correlation is 0.95. The
new correlation has also been applied to 6 polynitro arenes explosives from a
variety of chemical families in order to assess the predictive capability of
new method. Predicted results are close to the measured values for all of
tested polynitro arenes on the basis DTA.