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R. Marappan ¹, A. Ramamohana Rao ²

Affiliations
1 Government College of Engg., Salem-636 011, IN
2 Department of Mech Engg., I.I.T., Madras-36, IN

Abstract

Plain carbon steels when used as journal bearing materials have the disadvantage of metal to metal transfer, finally leading to seizure. But when they are treated with either sursulf treatment or tufftride, they behave satisfactorily. The specific wear rates are comparable to that of the conventional bearing materials, such as, brass or bronze.

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T. Sekar ¹, R. Marappan ²

Affiliations
1 Govt. College of Engg., Salem, IN
2 Paavai Institutions, Paichal, Namakkal, IN

Abstract

Electrochemical Machining (ECM), over the past decades has become one of the important methods in metal removal processes. ECM has established itself as one of the major alternatives to conventional methods for machining hard materials and complex contours without the residual stresses and tool wear. Studies on Metal removal rate (MRR) are of utmost importance in ECM, since it is one of the determining factors in the process decisions. In this work, an experimental investigation has been made on various process parameters involved in the Metal Removal Rate using ECM on AISI 1035 steel with NaCl aqua solution for three different electrolyte jet patterns. The effect of electrolyte jet patterns over MRR has been studied in detail and results evolved. Experimental metal removal rate has been calculated for different jet configurations and the obtained results reveal that the electrochemical machining of AISI 1035 by circular straight jet pattern gives better MRR than the other jet patterns.

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R. Malayalamurthi ¹, N. Vivek ¹, R. Marappan ¹

Affiliations
1 Department of Mechanical Engineering, Government College of Engineering, Salem -636 011, Tamil Nadu, IN

Abstract

The macroscopic simulation of contacting bodies, e.g. the contact between sphere and rigid flat, leads to the full visualization of the distribution of contact stresses between these bodies. The elastic plastic contact problem of a sphere and a rigid flat is solved by finite element method. Initially the finite element results are validated with Hertz model and extended beyond elastic limit. The dimensionless parameters for contact load, contact area and contact pressure are calculated for a wide range of interference values. The results are obtained for materials of varying E/Y (Young's modulus/yield stress) values. Results are compared with the existing elastic plastic contact models.

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