Semi-analytical Solution for Time-dependent Creep Analysis of Rotating Cylinders Made of Anisotropic Exponentially Graded Material (EGM)

Subject Areas : Engineering

A  Loghman ¹ (Faculty of Mechanical Engineering, University of Kashan)
V  Atabakhshian ² (Department of Mechanical Engineering, Faculity of Engineering, Bu-Ali Sina University)

Received: 2012-08-27 Accepted : 2012-10-05 Published : 2012-09-30

Keywords: EGM Rotating cylinder, Bailey-Norton creep law, History of stresses,

Abstract :

In the present paper, time dependent creep behavior of hollow circular rotating cylinders made of exponentially graded material (EGM) is investigated. Loading is composed of an internal pressure, a distributed temperature field due to steady state heat conduction with convective boundary condition and a centrifugal body force. All the material properties are assumed to be exponentially graded along radius. A semi analytical solution followed by the method of successive approximation has been developed to obtain history of stresses and deformations during creep evolution of the EGM rotating cylinder. The material creep constitutive model is defined by the Bailey-Norton time-dependent creep law. A comprehensive comparison has been made between creep response of homogenous and non-homogenous cylinder. It has been found that the material in-homogeneity exponent has a significant effect on creep response of the EGM cylinder. It has been concluded that using exponentially graded material significantly decreases creep strains, stresses and deformations of the EGM rotating cylinder.

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