Semi-analytical solution of magneto-thermo-elastic stresses for functionally graded variable thickness rotating disks |
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Authors: | A Ghorbanpour Arani A Loghman A R Shajari S Amir |
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Affiliation: | (1) Mechanical and Manufacturing Engineering Department, University Putra Malaysia, Serdang, 43400 UPM, Selangor, Malaysia;(2) Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Serdang, 43400 UPM, Selangor, Malaysia;(3) Department of Applied Mathematics, Z. H. College of Engineering and Technology, AMU, Aligarh, 202002, India;(4) Mechanical and industrial Engineering Department, Qatar University, Doha, Qatar;(5) Department of Mechanical Engineering, Texas A&M University, College Station, TX, USA |
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Abstract: | In this paper, a semi-analytical solution for magneto-thermo-elastic problem in functionally graded (FG) hollow rotating disks
with variable thickness placed in uniform magnetic and thermal fields is presented. Stresses and perturbation of magnetic
field vector in FG rotating disks are determined using infinitesimal theory of magneto-thermo-elasticity under plane stress
conditions. The material properties except Poisson’s ratio are modeled as power-law distribution of volume fraction. The profile
of disk thickness is assumed to be a parabolic function of radius. The non-dimensional distribution of temperature, displacement,
stresses and perturbation of magnetic field vector throughout radius are shown. Effects of material grading index, geometry
of the disk and magnetic field on the stress and displacement fields are investigated. The results of stresses and radial
displacements for two different boundary conditions with and without the effect of magnetic field are compared for a FG rotating
disk with concave thickness profile. It has been found that imposing a magnetic field significantly decreases tensile circumferential
stresses. Therefore the fatigue life of the disk will be significantly improved by applying the magnetic field. Results of
this investigation could be applied for optimum design of FG hollow rotating disks with variable thickness. |
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