Show simple item record

dc.contributor.authorStevens, John Boyeten_US
dc.date.accessioned2014-03-14T20:51:23Z
dc.date.available2014-03-14T20:51:23Z
dc.date.issued1996-11-22en_US
dc.identifier.otheretd-3753128097370en_US
dc.identifier.urihttp://hdl.handle.net/10919/36650
dc.description.abstractWe 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.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartUjce.moven_US
dc.relation.haspartUz2e.moven_US
dc.relation.haspartUz3e.moven_US
dc.relation.haspartWjce.moven_US
dc.relation.haspartWz2e.moven_US
dc.relation.haspartWz3e.moven_US
dc.relation.haspartstevens.pdfen_US
dc.rightsI hereby grant to Virginia Tech or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en_US
dc.subjecttaylor impact testen_US
dc.subjectballisticen_US
dc.subjectsimulationen_US
dc.subjectlocalizationen_US
dc.titleFinite Element Analysis of Adiabatic Shear Bands in Impact and Penetration Problemsen_US
dc.typeThesisen_US
dc.contributor.departmentEngineering Science and Mechanicsen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairBatra, Romesh C.en_US
dc.contributor.committeememberKohler, Werner E.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-3753128097370/en_US
dc.contributor.committeecochairKriz, Ronald D.en_US
dc.date.sdate1998-07-21en_US
dc.date.rdate1996-11-22
dc.date.adate1996-11-22en_US


Files in this item

Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record