Multiscale Modeling of the Nanodefects and Temperature Effect on the Mechanical Response of Sapphire. Issue 7 (15th April 2016)

• Record Type: Journal Article
• Authors: Zamani, Seyed Mohammad Mahdi; Iacobellis, Vincent; Behdinan, Kamran
• Editors: Ching, W.‐Y.
• Is Part Of: Journal of the American Ceramic Society. Volume 99:Issue 7(2016)
• Page Start: 2458
• Page End: 2466
• Publication Date: 2016-04-15
• Subjects: sapphire -- mechanical properties -- multiscale modeling -- defects -- failure; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.14243
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract : A multiscale approach using Bridging Cell Method (BCM) is applied to simulate the combined effect of temperature and alumina's common structural nanodefects such as nanovoids, precracks, and Mg impurities on the mechanical response of single crystal C‐plane and M‐plane sapphire. The BCM model consists of three domains of continuum, bridging, and atomistic, where the whole system is solved in a finite element (FE) framework. Interatomic interaction potentials and temperature‐dependent formulations are incorporated in the atomistic domain to conduct simulations for structures containing nanodefects at a range of finite temperatures from 300 to 1600 K. The results are compared for each case to analyze the effect of temperature and nanodefects. Mechanical response of the material is presented and discussed with respect to ultimate tensile strength (UTS), stress distribution and elasticity. Results show different material behavior for C‐plane and M‐plane under the same biaxial loading conditions but containing different nanodefects. Precracks are found to be the most critical defects for both systems, which significantly reduce structural strength.