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Creep stresses for a thick isotropic spherical shell by finitesimal deformation under steady-state temperature and internal pressure have been derived by using Seth's transition theory. Results are depicted graphically. It is seen that shell made of incompressible material require higher pressure to yield as compared to shell made of compressible material. For no thermal effects, the result are same as given by Gupta, Bhardwaj, Rana, Hulsurkar, Bhardwaj, and Bailey. Source

Thakur P.,Indus International University
WSEAS Transactions on Applied and Theoretical Mechanics | Year: 2011

Elastic-plastic transitional stresses in an annular disc having variable thickness and variable passion's ratio subjected to internal pressure has been derived by using Seth's transition theory. It is seen that thickness and passion's ratio variation influence significantly the stresses and pressure required for initial yielding. The thickness variation reduces the magnitude of the stresses and pressure needed for fully plastic state. It is seem for fully plastic state that circumferential stresses is maximum at the outer surface. Source

Thakur P.,Indus International University
Thermal Science | Year: 2014

Thermal stress and strain rates in a thick walled rotating cylinder under steady state temperature have been derived by using Seth's transition theory. For elastic-plastic stage, it is seen that with the increase of temperature, the cylinder having smaller radii ratios requires lesser angular velocity to become fully plastic as compared to cylinder having higher radii ratios The circumferential stress becomes larger and larger with the increase in temperature. With increase of thickness ratio stresses must decrease. For the creep stage, it is seen that circumferential stresses for incompressible materials maximum at the internal surface as compared to compressible material, which increase with the increase in temperature and measure n. Source

Narayan S.,Indus International University
International Journal of Applied Mechanics and Engineering | Year: 2015

Piston slap is the major force contibuting towards noise levels in combustion engines.This type of noise depends upon a number of factors such as the piston-liner gap, type of lubricant used, number of piston pins as well as geometry of the piston. In this work the lateral and rotary motion of the piston in the gap between the cylinder liner and piston has been analyzed. A model that can predict the forces and response of the engine block due to slap has been dicussed. The parameters such as mass, spring and damping constant have been predicted using a vibrational mobility model. Source

Taunk M.,Indus International University | Chand S.,National Institute of Technology Hamirpur
Journal of Applied Physics | Year: 2014

The temperature dependent current density-voltage (J-V) characteristics of flexible polypyrrole film sandwiched between metal electrodes (Ag, Al) are investigated in the wide temperature range of 10-300K. At all temperatures and low bias voltage, charge transport is governed by bulk limited processes with a bias dependent crossover from Ohmic (J∼V) to trap free space charge limited conduction (J∼V2). At high bias voltage (>3V) and low temperatures, the conduction becomes space charge limited with exponential distribution of traps. We estimated an average trap energy 29.9eV and trap density of the order of 1012cm-3. © 2014 AIP Publishing LLC. Source

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