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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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THE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING
GEORGIA INSTITUTE OF TECHNOLOGY
Under the provisions of the regulations for the degree
DOCTOR OF PHILOSOPHY
on Tuesday, July 27, 2021
3:00 PM
via
BlueJeans Video Conferencing
https://bluejeans.com/375265351/7080
will be held the
DISSERTATION PROPOSAL DEFENSE
for
Keara Frawley
“Design of Materials Tolerant to Spall Failure at High Strain Rates”
Committee Members:
Prof. Rampi Ramprasad, Advisor, MSE
Prof. Naresh Thadhani, Advisor, MSE
Prof. Chaitanya Deo, ME/MSE
Prof. Chao Zhang, CSE
Jennifer Jordan, Ph.D., Los Alamos National Laboratory
Abstract:
Materials tolerant to dynamic tensile “spall” failure are of interest for applications involving high-velocity impact. Metals and polymers generally have favorable responses to such extreme conditions, and are therefore useful in shock absorbing material applications, such as automotive or body armor. There is, however, a limited understanding of the dependence of spall strength, i.e., resistance to dynamic tensile failure, on typical mechanical properties such as hardness, toughness, strengths, and elastic moduli. The proposed work is aimed at determining the relationship between these properties, henceforth referred to as “proxy” properties, and spall strength, with the goal of developing a predictive model for identifying dynamic tensile spall strengths of metals and polymers.
The specific research tasks will involve employing various methods for collecting/generating a database on spall strengths and proxy properties of metals and polymers through literature survey, plate-on-plate impact experiments, and computational simulations. Potential proxy properties will be correlated to spall strength through data analytic methods. The main objective will be to develop a set of materials design guidelines that can be used to understand the fundamental mechanisms of how metals and polymers fail under high strain rate impact, i.e., dynamic tensile loading, and to predict the spall strength properties of untested materials.
