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Mallinatha V.,Sjm Institute Of Technology
Journal of Reinforced Plastics and Composites | Year: 2011

Effect of silicon carbide and aluminium oxide fillers on tension, flexural, compression, and impact properties of woven jute fabric reinforced epoxy composite has been investigated experimentally. Several laminates were prepared by hand lay-up technique by varying the percentage of filler addition. Tests (except impact) were conducted on computer interfaced universal testing machine as per ASTM standards. Impact tests were conducted on pendulum impact testing machine. The results of the tests indicated that addition of filler has significant effect on these properties. Laminate with 10 wt% of filler (based on resin) exhibited the highest properties. The properties were found to decrease beyond 10 wt% of filler loading. The mode of failure was also studied for selected samples using scanning electron microscope. © The Author(s) 2011.

Raj Prakash H.G.,Mangalore University | Sanjeev G.,Mangalore University | Vijay Kumar K.B.,Mangalore University | Harish Kumar H.G.,SJM Institute of Technology | And 3 more authors.
International Journal of Modern Physics E | Year: 2011

Photofission cross-section of 238U was measured using bremsstrahlung radiation energy 7.49.0 MeV with energy step of 0.4 MeV by employing Lexan polycarbonate film as solid state nuclear track detector (SSNTD). The photon intensity from the Microtron accelerator at a distance of 15 cm from the bremsstrahlung converter (tantalum target) facility was estimated to be 1010 photons/sec using the code EGS-4. In this paper, details of the fission fragment angular distribution measurements of 238U target using Lexan polycarbonate have been discussed. The photofission cross-section was calculated using the angular distribution of fission fragments and the results were compared with those obtained using the code EMPIRE-II and various barrier parameters of the RIPL-1, RIPL-2 libraries and with the new analytical fission barrier formula based on the HugenholtzVan Hove theorem. The present experimental measurements were in good agreement with the results obtained from the Empire-II code predictions for potential parameter taken from RIPL-1 and a newly developed analytical fission barrier formula. © 2011 World Scientific Publishing Company.

Jagannatha N.,SJM Institute of Technology | Somashekhar S.H.,Indian Institute of Technology Madras | Sadashivappa K.,Bapuji Institute of Engineering and Technology
Machining Science and Technology | Year: 2012

Abrasive Jet Machining is becoming one of the most prominent machining techniques for glass and other brittle materials. In this article, an attempt has been made to combine abrasive and hot air to form an abrasive hot air jet. Abrasive hot air jet machining can be applied to various operations such as drilling, surface etching, grooving and micro finishing on the glass and its composites. The effect of air temperature on the material removal rate applied to the process of glass etching and grooving is discussed in this article. The roughness of machined surface is also analyzed. It is found that the Material Removal Rate (MRR) increases as the temperature of carrier media (air) is increased. The results have revealed that the roughness of machined surface is reduced by increasing temperature of carrier media. The mechanism of material removal rate has been discussed with aid of SEM micrographs. © 2012 Taylor & Francis Group, LLC.

Mallinatha V.,Sjm Institute Of Technology
Materials and Design | Year: 2012

The effect of ceramic fillers like SiC and Al2O3 on wear behavior of jute/epoxy composite has been experimentally investigated. The laminates of jute/epoxy composites with fillers in 5%, 10% and 15% based on weight of resin were prepared using hand layup technique. The dry sliding wear tests were conducted using pin-on-disc wear test machine. Tests were conducted for a constant sliding distance of 1800m and a track radius of 50mm. For each composition, wear tests were conducted for different sliding velocities (3m/s, 4.5m/s and 6m/s) by applying normal loads of 30N, 40N and 50N. The wear loss and coefficient of friction were plotted against the normal load and sliding velocity for composites with both types of fillers. The results reveal that incorporation of fillers leads to significant improvement in the wear resistance of jute/epoxy composite. It is observed that Al2O3 filled composite has better wear resistant than SiC filled. Worn surfaces of selected samples were sputter coated with a thin layer of gold and then subjected to scanning electron microscopy to analyze the mechanism of wear. © 2011 Elsevier Ltd.

Manohara H.R.,SJM Institute of Technology | Chandrashekharaiah T.M.,Kalpatru Institute of Technology | Venkateswarlu K.,National Aerospace Laboratories, Bangalore | Kori S.A.,Basaveshwar Engineering College | Kori S.A.,Visvesvaraya Technological University
Tribology International | Year: 2012

Intermetallic particles of Al 3Ti, TiB 2, AlB 2 and Al 4Sr were added to A413 alloy, and sliding wear tests were carried out under dry sliding conditions at room temperature as well as at high temperatures of 60, 120, and 180°C. The results demonstrate that contacting surfaces at high temperature conditions are susceptible to oxidation and the wear rate of reinforced alloys is reduced. This is due to the formation of glazing layer that offers protection. Moreover, intermetallic particles played an important role as grain modifier/refiner and were responsible for reduced wear and friction. © 2012 Elsevier Ltd. All rights reserved.

Manohara H.R.,SJM Institute of Technology | Chandrashekharaiah T.M.,Kalpatru Institute of Technology | Venkateswarlu K.,National Aerospace Laboratories, Bangalore | Kori S.A.,Basaveshwar Engineering College | Kori S.A.,Visvesvaraya Technological University
International Journal of Advanced Manufacturing Technology | Year: 2013

Dry sliding wear behaviour of Al-Si A413 alloy with and without intermetallics has been studied at ambient and elevated temperatures. It is observed that as the temperature is increased, the wear rate decreased. The reduction in wear rate is mainly attributed to the formation of glazing layers at elevated temperature and is observed in both A413 alloy with and without intermetallics. The wear due to oxidation is predominant during high temperature sliding. © 2012 Springer-Verlag London Limited.

Ganiger B.M.,Kalpataru Institute of Technology | Mata C.T.,Kalpataru Institute of Technology | Manohara H.R.,Sjm Institute Of Technology | Prasad T.B.,Sri Siddharth Institute of Technology
Industrial Lubrication and Tribology | Year: 2015

Purpose - The main purpose of the research paper is to study the effect of refinement of primary silicon on sliding wear behavior of commercially available LM-28 alloy and correlate these with the micro-structural and mechanical properties. It is well known that the refinement of primary silicon increases the toughness, ultimate tensile stress (UTS) and wear resistance of the Al-Si alloys at ambient temperature. But exact addition level is not clearly mentioned in the paper; hence, the present paper throws light on the addition level for refinement of primary silicon present in LM-28 alloy. Design/methodology/approach - In the present paper, commercially available LM-28 alloy was prepared in the laboratory before and after the addition of Cu-P master alloy. Further wear studies will be carried out at room temperature. Wear properties are correlated with microstructure and mechanical properties. Findings - Improvements in mechanical properties were observed after refinement of the primary silicon present in LM-28 alloy. Research limitations/implications - Further studies are required regarding in-depth investigation of refinement of primary silicon and its effects on the life of the components prepared by this alloy. Practical implications - The data obtained from the research paper help the manufacturers of automotive, aerospace and marine components, such as pistons, cylinder heads and blocks, etc. Social implications - The present research work will be an essential information required for the students of undergraduate, postgraduate and research scholars to carry out research at an R&D centre. Originality/value - Experiments are conducted at an R&D centre and analyses were carried out for structural changes, mechanical properties and wear properties. Further, the results are compared with other researcher's data. © 2015 Emerald Group Publishing Limited.

Jagannatha N.,SJM Institute of Technology | Hiremath S.S.,Indian Institute of Technology Madras | Sadashivappa K.,Bapuji Institute of Engineering and Technology
International Journal of Mechanical and Materials Engineering | Year: 2012

Carrier media plays a major role in removal of material in Abrasive Jet Machining (AJM). In this paper, an attempt has been made to use hot air as carrier media in AJM. Modified Taguchi robust design analysis is employed to determine optimal combination of process parameters. The Analysis Of Variance (ANOVA) is also applied to identify the most significant factor. It can be found that the air temperature is the most significant factor on Material Removal Rate (MRR) and Roughness of machined surface (Ra). It has been observed that there is good agreement between the predicted values and experimental values of optimization. The influence of temperature on MRR and Ra has been discussed. It can be found that at high temperature, there is a sufficient evidence of more plastic deformation accompanied by brittle fracture failure which results in increase of MRR and reduction of roughness.

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