Multiscale Modeling of Non-crystalline Ceramics (Glass)

Report No. ARL-MR-0765
Authors: George A. Gozanas, James W. McCauley, Iskander G. Batyrev, Richard C. Becker, Parimal Patel, Betsy M. Rice, N. Scott Weingarten
Date/Pages: February 2011; 38 pages
Abstract: This six-month progress report describes an ongoing program on the multiscale modeling of noncrystalline ceramics (glass) funded from the Director's Strategic Initiatives (DSIs) in support of the U.S. Army Research Laboratory's (ARL) Strategic Research Initiatives. 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 shaped-charge jets; 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 the Weapons 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 in the defeat of shaped-charge jets and other ballistic threats.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2011