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Multiscale Modeling of the Effect of Nanoscale Defects on Al2O3 Mechanical Behavior

[+] Author Affiliations
Seyed Mohammad Mahdi Zamani, Vincent Iacobellis, Kamran Behdinan

University of Toronto, Toronto, ON, Canada

Paper No. IMECE2015-50770, pp. V009T12A067; 6 pages
doi:10.1115/IMECE2015-50770
From:
  • ASME 2015 International Mechanical Engineering Congress and Exposition
  • Volume 9: Mechanics of Solids, Structures and Fluids
  • Houston, Texas, USA, November 13–19, 2015
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5752-6
  • Copyright © 2015 by ASME

abstract

This study presents a multiscale framework to simulate the effect of nanovoids on the mechanical response of α-Al2O3 at finite temperatures. The bridging cell method, which divides the system into three domains (atomistic, bridging and continuum) and incorporates a finite element method throughout the system, was performed for the simulations. Two important crystal orientations of basal and prismatic planes of α-Al2O3’s hexagonal crystal structure were selected. The simulations were conducted at room temperature, 300K, and fire temperature, 1400K, based on the variety of in-service temperatures alumina is being applied in. The results were compared with respect to deformation behavior, stress distribution and ultimate tensile strength. Results showed different failure mechanism and tensile strength for the two crystal orientations. In addition, the magnitude of stresses and material’s deformation were increased at higher temperatures, where the ultimate tensile strength slightly reduced.

Copyright © 2015 by ASME

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