Exact Thermomechanical Characteristics of a Pressurized Rotating Circular Annulus or a Disc Made of Functionally Graded (FG) Hypothetical and Physical Materials


YILDIRIM V.

JORDAN JOURNAL OF MECHANICAL AND INDUSTRIAL ENGINEERING, cilt.12, ss.215-229, 2018 (ESCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 12 Konu: 3
  • Basım Tarihi: 2018
  • Dergi Adı: JORDAN JOURNAL OF MECHANICAL AND INDUSTRIAL ENGINEERING
  • Sayfa Sayısı: ss.215-229

Özet

In the present study, thermomechanical characteristics of a functionally graded (FG) uniform traction-free circular annulus are determined analytically under separate and combined centrifugal, steady-state thermal and pressure loads based on the one-dimensional axisymmetric plane-stress assumption. It is assumed that elasticity modulus, density, thermal expansion coefficient and thermal conductivity are all to be continuously changed in the radial direction with different inhomogeneity indexes of a simple power law material grading rule while Poisson's ratio is kept constant. Hypothetically and physically chosen metal-ceramic pairs such as nickel-silicon nitride (Ni-Si3N4), aluminum-aluminum oxide (Al-Al2O3), and stainless steel-zirconium oxide (SUS304-ZrO2) are included in the parametric studies. Results of conducting separate and combined effects of centrifugal, thermal, and pressure loadings are presented in both tabular and graphical forms in a comparative manner. Those works mostly suggest that the effect of thermal loads may be either negligible compared to inertia forces or may be having higher importance than the inertias. It is also deduced that the thermal characteristics of both individual metal and ceramic are totally different from FGM's thermal traits. (C) 2018 Jordan Journal of Mechanical and Industrial Engineering. All rights reserved