Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website http://www.gpo.gov/fdsys; (3) the federal government Internet portal USA.gov; or (4) a web search conducted using a commercial search engine such as http://www.google.com.
Accession Number ADA570722
Title Multiscale Modeling of Non-crystalline Ceramics (Glass) (FY11).
Publication Date Jan 2012
Media Count 68p
Personal Author G. A. Gazonas I. G. Batyrev J. W. McCauley R. C. Becker S. Izvekov
Abstract This second-year 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.
Keywords Amorphous quartz
Ballistic impact damage
Borosilicate glass
Bulk modulus
Ceramic glasses
Ceramic materials
Damage assessment
Densification
Dsi(Directors strategic initiative)
Edge-on- impact studies
Equations of state
Fragmentation
Fused silica
Glass
Glass plates
Indentation
Inelastic deformation
Microcracking
Molecular dynamics
Multiscale modeling
Nanoindentation
Peridynamics
Plastic properties
Plasticity
Polyamorphic transformation
Pressure
Quantum mechanics
Shaped charge jets
Stresses
Transparent armor

 
Source Agency Non Paid ADAS
NTIS Subject Category 71D - Ceramics, Refractories, & Glass
Corporate Author Army Research Lab., Aberdeen Proving Ground, MD. Weapons and Materials Research Directorate.
Document Type Technical report
Title Note Rept. for Nov 2010-Nov 2011.
NTIS Issue Number 1315
Contract Number N/A

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader