| || Elastic-plastic Transition of Transversely Isotropic Thick-walled Rotating Cylinder under Internal Pressure
Author : Sharma, Sanjeev;Sahni, Manoj;Kumar, Ravindra
Source : Defence Science Journal ; Vol:59(3) ; 2009 ; pp 260-264
Subject : 53 Applied Physics
Keywords : Elastic-plastic transition;Transversely isotropic cylinder;Isotropic;Rotating cylinder
Abstract : Elastic-plastic stresses for a transversely isotropic thick-walled rotating cylinder under internal pressure have been obtained by using Seth’s transition theory. It has been observed that a thick-walled circular cylinder made of isotropic material yields at the internal surface at a high pressure as compared to cylinder made of transversely isotropic material. With the increase in angular speed, much less pressure is required for initial yielding at the internal surface for transversely isotropic material as compared to isotropic material. For fullyplastic state, circumferential stress is maximum at the external surface. Thick-walled circular cylinder made of transversely isotropic material requires high percentage increase in pressure to become fully plastic as compared to isotropic cylinder. Therefore, circular cylinder made of transversely isotropic material is on the safer side of the design as compared to cylinder made of isotropic material.
| || Thermo Creep Transition in Non-homogeneous Thick-walled Rotating Cylinders
Author : Sharma, Sanjeev
Source : Defence Science Journal ; Vol:59(1) ; 2009 ; pp 30-36
Subject : 53 Applied Physics
Keywords : Rotating cylinder;Creep;Thermal stresses;Transition theory
Abstract : Creep stresses have been derived using transition theory7. The results for the combined effects of angular speed and temperature are calculated and depicted graphically. It has been observed that a cylinder made of less compressible material at the internal surface and highly compressible at the outer surface is on the safer side of the design for different values of N, W2 and temperature as compared to highly compressible material at the internal surface and less compressible at the outer surface.
| || Unsteady Flow and Heat Transfer in a Viscous Incompressible Fluid due to the Oscillations of a Porous Cylinder with Suction
Author : Lal , Jangi
Source : Defence Science Journal ; Vol:20(1) ; 1970 ; pp 45-52
Subject : 532.542 Fluid Dynamics
Keywords : Rotating cylinder ;Suction parameter;Cylinder oscillating
Abstract : Navier-Stokes equations which described the unsteady flow of viscous incompressible fluid a around a porous infinite circular cylinder oscillating harmonically with constant suction are integrated using Laplace transform. Curves have been drawn of the steady state part of the velocity both for suction and without suction case and it is found that for each value of suction parameter a situation which does not exist in the case of rotating cylinder. The energy equation has also been solved and the solutions are given for large and small values of time.