John Boyet Stevens
Thesis submitted to the Faculty of the Virginia Tech in partial fulfillment of the requirements for the degree of
Master of Science
Engineering Science and Mechanics
Prof. Romesh C. Batra, Chair
Prof. Ronald D. Kriz, Co-Chair
Prof. Werner Kohler
November 22, 1996
We study axisymmetric deformations of depleted uranium (DU) and tungsten heavy alloy (WHA) rods impacting at normal incidence both a rigid, planar target and a thick, deformable steel target. Each deformable material is modeled as elastic thermoviscoplastic; the flow stress increases with an increase in the effective plastic strain and effective plastic strain-rate but decreases with a rise in the temperature. An objective of this work is to ascertain when and where a shear band, defined as a narrow region of rapid, intense plastic deformation, forms in each material subject to impact loading. The Taylor impact simulations show that shear bands form earlier in WHA than in DU for the material parameters used. In the penetration simulations, shear bands form continuously in the ejecta of the DU penetrator while only one shear band occurs in the WHA ejecta followed by more uniform deformations. Note: In order to view the computer animations referenced in this thesis, one must have a QuickTime movie player and download the files named Ujce.mov Uz2e.mov Uz3e.mov Wjce.mov Wz2e.mov and Wz3e.mov from the same directory the "pdf" file resides in.
List of attached files
File Name Size (Bytes) Ujce.mov 3,931,024 Bytes Uz2e.mov 3,869,329 Bytes Uz3e.mov 4,192,560 Bytes Wjce.mov 3,970,353 Bytes Wz2e.mov 2,955,895 Bytes Wz3e.mov 1,484,309 Bytes stevens.pdf 2,883,663 Bytes
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