Papers by Author: L. Vijayaraghavan

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Authors: Sundaram Raja Kumar, L. Vijayaraghavan, M.M. Mayuram
Abstract: Erosion due to solid particles impact has a detrimental effect on the performance of components used in various applications. Hard facing is widely used to combat wear in such situations. D-gun coating is increasingly popular for such applications. Alumina-titania composite has been deposited on mild steel substrate. The coating has been characterized and their tribological responses have been evaluated. Resistance to erosion, evaluated through standard dry erosion test is highlighted in this work. An orthogonal full–factorial experimental matrix which includes all possible variables that contribute to brittle erosion was designed, conducted and validated. The variation of erosion rate with process parameters was mathematically modeled by using the regression analysis method.
Authors: P. Radhakrishnan, L. Vijayaraghavan, N. Ramesh Babu
Abstract: Wire Electrical Discharge Machining (WEDM) is a thermal process that involves melting and vaporisation of work material by a wire electrode in order to obtain the required size. The present work covers a study to improve the material removal rate (MRR) and to machining required slot size by varying frequency lateral vibration of wire while WEDM machining on AISI H13. The machining experiments were conducted by means of two electrode wire materials such as brass and zinc coated wires. The experiments mainly focused on surface integrity aspects like surface/sub surface microstructure, kerf width and surface roughness modification of surfaces machined with Wire Electrical Discharge Machining. The experimental results present the machinability of work material with WEDM process with varying frequency of vibration of wire electrode materials.
Authors: P. Suya Prem Anand, N. Arunachalam, L. Vijayaraghavan
Abstract: In recent development of dental restoration, zirconia has been used as a prosthetic material due to their enhanced properties of fracture strength and toughness compared to other ceramic materials. Zirconia based ceramic materials are used in structural application in engineering, such as in the manufacture of cutting tools, gas sensors, refractories. Grinding was used as the efficient technique to finish ceramic materials. Due to the hard and brittle nature of a ceramic material, the grounded components were left with surface and subsurface damages. In this paper, the influence of the grinding parameters on the grindability of yttrium partially stabilized zirconia was carried out using a diamond grinding wheel. The resin bonded grinding wheel was used to analyze the grinding behavior of the material. The grinding force and surface roughness were measured during the grinding process and the experiments were conducted under conventional flooded conditions. The relationship between the surface finish and grinding parameters such as depth of cut, wheel speed were analyzed.
Authors: S.N. Arul Saravanapriyan, L. Vijayaraghavan, Ramalingam Krishnamurthy
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