Title page for ETD etd-3753128097370


Type of Document Master's Thesis
Author Stevens, John Boyet
URN etd-3753128097370
Title Finite Element Analysis of Adiabatic Shear Bands in Impact and Penetration Problems
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Kohler, Werner E.
Batra, Romesh C. Committee Chair
Kriz, Ronald D. Committee Co-Chair
Keywords
  • taylor impact test
  • ballistic
  • simulation
  • localization
Date of Defense 1996-11-22
Availability unrestricted
Abstract
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.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  stevens.pdf 2.88 Mb 00:13:21 00:06:51 00:06:00 00:03:00 00:00:15
  Ujce.mov 3.93 Mb 00:18:11 00:09:21 00:08:11 00:04:05 00:00:20
  Uz2e.mov 3.87 Mb 00:17:54 00:09:12 00:08:03 00:04:01 00:00:20
  Uz3e.mov 4.19 Mb 00:19:24 00:09:58 00:08:44 00:04:22 00:00:22
  Wjce.mov 3.97 Mb 00:18:22 00:09:27 00:08:16 00:04:08 00:00:21
  Wz2e.mov 2.96 Mb 00:13:41 00:07:02 00:06:09 00:03:04 00:00:15
  Wz3e.mov 1.48 Mb 00:06:52 00:03:32 00:03:05 00:01:32 00:00:07

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