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2 Mechanics and Mechanical Engineering

2 2017

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Workability behavior of hybrid copper matrix composites synthesized by powder metallurgy technique

Ilayaraja K., Ranjith Kumar P., Anandakrishnan V., Sathish N., Ravichandran V., Ravikumar R.

Mechanics and Mechanical Engineering

2017

Vol. 21, nr 2

207--216

Copper based hybrid composite materials with 5wt.% of titanium dioxide and 0wt.%, 2wt.% and 4wt.% of graphite were produced using powder metallurgy technique. The presence and distribution of titanium dioxide and graphite reinforcements were examined in the copper matrix using scanning electron microscopic and energy dispersive spectroscopic analysis. To investigate the workability behavior of the sintered composite preforms, cold upset tests were conducted and various stresses and forming parameters were determined and using that various stress ratio parameters such as the true axial stress versus the true effective stress, the true hoop stress versus the true effective stress, the true hydrostatic stress versus the true effective stress and the true hoop stress versus the true hydrostatic stress were calculated and correlated with the true axial strain. From the studies, the workability of the composite is found to increase with increasing graphite content due to increase in lubricating affect by graphite addition.

Optimization kerf width and surface roughness in wirecut electrical discharge machining using brass wire

Panner Selvam M., Ranjith Kumar P.

Mechanics and Mechanical Engineering

2017

Vol. 21, nr 1

37--55

Wire Electric Discharge Machining (WEDM) is one of the important non-traditional machining process used for machining difficult to machine materials like composites and inter-metallic materials, Intricate profiles. In the present work, the study has been made to optimize the process parameters during machining of Hastelloy -C-276 by wire-cut electrical discharge machining (WEDM). This paper presents an effective approach to optimize process parameters for Wire electric discharge machining (WEDM) is extensively used in tool and die industries. Precision and intricate machining are the strengths. While machining, time and surface quality still remains as major challenges. The input parameters are pulse on time (Ton), pulse off time (Toff), wire feed rate and current and voltage were changed during the process. The optimization of analysis is performed by using Genetic Algorithm (GA) method L-27 orthogonal array.