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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.

Radius problems for a class of analytic functions

Ravichandran V., Khan M., Silverman H., Subramanian K.

Demonstratio Mathematica

2006

Vol. 39, nr 1

67-74

In this present paper, we investigate certain radius problems for a class of normalized analytic functions in the open unit disk in the complex plane.

Radius of strong starlikeness of certain p-valent analytic functions

Gangadharan A., Ravichandran V., Shanmugam T.

Zeszyty Naukowe Politechniki Rzeszowskiej. Matematyka

2000

z. 24 [181]

37-47

Let Q (z) be a polynomial of degree n > 0 with no zeros in \z\ < R, R > 1, f (z) be analytic in [delta] = {z : \z\ < 1} . The Radius of strong starlikeness of the function F (z) = f (z) [Q (z)] " ,beta /n real, is computed under various conditions on f (z).