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Performance Evaluation of PCD 1500 Grade Insert on Turning A356 Alloy
with 10% Reinforcement of SiC Particles
-- N Muthukrishnan and R Ramanujam
Aluminum silicon carbide Metal Matrix Composites (Al-MMCs) are widely used in aeronautical
and automobile industries due to their excellent mechanical and physical properties. However,
machining these composites is difficult because of the harder reinforcement particles. Tools wear more
quickly, thereby reducing their life. This paper presents an experimental investigation on turning A356
matrix metal reinforced with 10% by weight of Silicon Carbide particles (SiCp) , fabricated in-house by
stir casting method. Fabricated samples are turned on medium duty lathe with Poly Crystalline
Diamond (PCD) insert of 1500 grade at various cutting conditions. Parameters such as power consumed by
main spindle, machined surface roughness and tool wear are studied. Scanning Electron Microscope
(SEM) images support the result. It is evident that surface finish is good at higher cutting speed and tool wear
is strongly dependent on abrasive hard reinforcement particles.
© 2011 IUP. All Rights Reserved.
Performance Evaluation of Karanja Biodiesel
Used as a Fuel in Diesel Engine
-- Varun, Amar Patnaik, Niraj Kumar and D R Tiwari
An experimental study was carried out to compare the parameters—Brake Power (BP), Specific
Fuel Consumption (SFC), Brake Thermal Efficiency (BTE) and Exhaust Gas Temperature (EGT)—of
different compositions of biodiesel and conventional diesel. Tests were performed on a single cylinder direct
injection engine operating on diesel fuel, Karanja biodiesel and blends of diesel and Karanja biodiesel in
proportions of 100/0%, 80/20%, 60/40% and 40/60% (v/v). The design approach based on Taguchi's
orthogonal arrays was adopted for carrying out experiments. The results show that Karanja biodiesel can be
conveniently used as a diesel substitute in Compression Ignition (CI) engine. There was an increase in BTE, BP and
a reduction in SFC for Karanja biodiesel blends with diesel. An Artificial Neural Network (ANN)
model was also prepared by using some experimental data for training and standard back-propagation
algorithm for the CI engine.
© 2011 IUP. All Rights Reserved.
CFD Analysis of Pump Performance with Fluids Having Different Viscosity at Different Exit
Blade Angles
-- Pradipsinh Rana, Nikul K Patel and J I Nanavati
The objective of this paper is to study the effect of the exit blade angle on the performance of a
centrifugal pump when the pump handles fluids of varying viscosity. To achieve the said objective, one radial
centrifugal pump was selected. The pump has to supply the fluid at the head of 40 m having a flow rate of 288
cum/h. The speed is 1,450 rpm. The data required by the software for model generation are calculated
manually using the method suggested by Stepanoff. A model is prepared in ANSYS for exit blade angles of
24.5°, 26°, 28°, 29.5° and 31°. The said models of different blade angles are simulated in ANSYS at
various operating conditions. For each exit blade angle, the fluid of different viscosity is taken to study its effect
on pump performance. The fluids taken are water, castor oil, engine oil and methanol. It is found that as
the exit blade angle increases, the performance of the pump improves. Also as the viscosity of the
fluids increases, the efficiency decreases and the power consumption increases. It is found that as the
pump handles high viscous fluids then the Best Efficiency Point (BEP) is obtained at a higher exit blade
angle, because as the exit blade angle increases, the wake/turbulence at the exit of the impeller decreases.
© 2011 IUP. All Rights Reserved.
Modeling of Material Removal Rate
in Ultrasonic Machining of Titanium: Buckingham-P Approach
-- R Singh and J S Khamba
In the present study, the outcome of Taguchi-based model has been used for developing a
mathematical model using Buckingham's p-theorem for ultrasonic machining of titanium and its alloys. Six
input parameters, namely, tool material, power rating, slurry type, slurry temperature, slurry
concentration and slurry grit size were selected to give the output in the form of material removal rate. The
proposed study sheds light on the application of
Buckingham-p approach to model the main effects of these
variables on material removal rate in ultrasonic machining of titanium and its alloys. The comparison
with experimental results will also serve as further validation of the model.
© 2011 IUP. All Rights Reserved.
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