Journal of the Association of Engineers, India

B. B. Roy ¹, S. Pal ¹, M. Bhattacharyya ¹

Affiliations
1 Mechanical Engineering Department, Jadavpur University, IN

Abstract

Hydrostatic lubrication is a type of fluid lubrication where the bearing surfaces are kept separated by a film of fluid. The pressure which supports the load on the bearing is supplied to the film by an external source like pump, accummulator etc. Hydrostatic lubrication considerably reduces friction and wear and is of practical importance in applications where load is very high like radars, big telescopes, turbines, machine tools etc.

The present paper deals with design and development of a testing rig for the study of the pressure distribution, flowrate, load capacity and hence to optimize some of its design parameters.

Full Text

     

S. Saha Roy ¹, S. Pal ¹

Affiliations
1 Mechanical Engineering Department, Jadavpur University, IN

Abstract

In this preliminary study the variations of stress-distribution are analysed in different human joints using two-dimensional finite element technique. The aim is to develop a generalised programme for any type of human joint and can be used withs uitable for the data element properties. The mathematical model accommodates experimentally measured spatial variations of the bone stiffness of different joints. Such spatial variations in bone-stiffness emphasise the inherent inhomogeneity and anistropy of bone structure. This application of two dimensional finite elment technique also analyses the human joint reconstruction with artificial prosthesis fixed with polymethyl methacrylate. It includes the solution of stress field at various locations of the reconstruction zone. The analysis of stress field will explain the different modes of failure of the bone-cement bond and the cement prosthses bond. Computer analysis of stress pattern will suggest a possible cause for disruption of blood supply in some parts of human joints. This of course helps osteotomy, to redistribute the mechanical stresses in a favourable manner to provide uninterupted blood supply. Also it will help to improve the design of better prosthesis and characterise the requirement of ideal bone cement.

Full Text

     

B. B. Roy ¹, S. Pal ¹, M. Bhattacharyya ¹

Affiliations
1 Mechanical Engineering Department, Jadavpur University, IN

Abstract

Hydrostatic lubrication is a type of fluid film lubrication where the bearing surfaces are kept separated by a film of fluid. The pressure which supports the load on the bearing is supplied to the film by an external source like pump, accummulator etc. Hydrostatic lubrication considerably reduces friction and wear and is of practical importance in applications where load is very high like radars, big telescopes, turbines, machine tools etc.

Full Text