Multiscale Modeling of Non-crystalline Ceramics (Glass) (Final Report)

Report No. ARL-TR-6353
Authors: George Gazonas, James McCauley, Iskander G. Batyrev, Richard C. Becker, Sergei Izvekov, Timothy A. Jenkins, Parimal Patel, Betsy M. Rice, Brian E. Schuster, N. ScottWeingarten, & Raymond A. Wildman
Date/Pages: March 2013; 128 pages
Abstract: This third-year final report describes results on the multiscale modeling of noncrystalline ceramics (glass) funded from the Directors Strategic Initiative (DSI) in support of the U.S. Army Research Laboratorys (ARL) Strategic Research Initiative. The long-term research goal of the program is to develop a concurrent multiscale computational finite element code for optimizing or enhancing the performance of various glasses against ballistic threats; the initial work focuses on pure fused-silica (a-SiO2) and chemically varied a-SiO2 materials. As such, this objective falls squarely within the purview of theWeapons and Materials Research Directorate, since multiscale models are constitutive models (specific to a particular material) wherein time-evolving short- and intermediate-range atomic structure, order, and microcrack initiation and growth are fully coupled to the macroscale, a phenomenon that cannot be modeled or accounted for using classical homogenization methods. A more immediate research objective is to understand why certain chemically substituted a-SiO2 materials exhibit enhanced performance when defeating shaped-charge jets and other ballistic threats.
Distribution: Approved for public release
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Last Update / Reviewed: March 1, 2013