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Title: Shock compression and quasielastic release in tantalum

Abstract

Previous studies of quasielastic release in shock-loaded FCC metals have shown a strong influence of the defect state on the leading edge, or first observable arrival, of the release wave. This is due to the large density of pinned dislocation segments behind the shock front, their relatively large pinning separation, and a very short response time as determined by the drag coefficient in the shock-compressed state. This effect is entirely equivalent to problems associated with elastic moduli determination using ultrasonic methods. This is particularly true for FCC metals, which have an especially low Peierls stress, or inherent lattice resistance, that has little influence in pinning dislocation segments and inhibiting anelastic deformation. BCC metals, on the other hand, have a large Peierls stress that essentially holds dislocation segments in place at low net applied shear stresses and thus allows fully elastic deformation to occur in the complete absence of anelastic behavior. Shock-compression and release experiments have been performed on tantalum (BCC), with the observation that the leading release disturbance is indeed elastic. This conclusion is established by examination of experimental VISAR records taken at the tantalum/sapphire (window) interface in a symmetric-impact experiment which subjects the sample to a peak longitudinal stressmore » of approximately 7.3 GPa, in comparison with characteristic code calculations. [copyright] 1994 American Institute of Physics« less

Authors:
; ; ;  [1]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
6929680
Report Number(s):
CONF-921145-
Journal ID: ISSN 0094-243X; CODEN: APCPCS
Resource Type:
Conference
Journal Name:
AIP Conference Proceedings (American Institute of Physics); (United States)
Additional Journal Information:
Journal Volume: 309:1; Conference: Production and neutralization of negative ions and beams, Upton, NY (United States), 9-13 Nov 1992; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; SHOCK WAVES; TANTALUM; BCC LATTICES; COMPRESSION; DISLOCATIONS; IMPACT SHOCK; STRESS RELAXATION; VERY HIGH PRESSURE; WAVE FORMS; CRYSTAL DEFECTS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CUBIC LATTICES; ELEMENTS; LINE DEFECTS; METALS; RELAXATION; TRANSITION ELEMENTS; 360103* - Metals & Alloys- Mechanical Properties

Citation Formats

Johnson, J N, Hixson, R S, Tonks, D L, and Gray, III, G T. Shock compression and quasielastic release in tantalum. United States: N. p., 1994. Web.
Johnson, J N, Hixson, R S, Tonks, D L, & Gray, III, G T. Shock compression and quasielastic release in tantalum. United States.
Johnson, J N, Hixson, R S, Tonks, D L, and Gray, III, G T. Sun . "Shock compression and quasielastic release in tantalum". United States.
@article{osti_6929680,
title = {Shock compression and quasielastic release in tantalum},
author = {Johnson, J N and Hixson, R S and Tonks, D L and Gray, III, G T},
abstractNote = {Previous studies of quasielastic release in shock-loaded FCC metals have shown a strong influence of the defect state on the leading edge, or first observable arrival, of the release wave. This is due to the large density of pinned dislocation segments behind the shock front, their relatively large pinning separation, and a very short response time as determined by the drag coefficient in the shock-compressed state. This effect is entirely equivalent to problems associated with elastic moduli determination using ultrasonic methods. This is particularly true for FCC metals, which have an especially low Peierls stress, or inherent lattice resistance, that has little influence in pinning dislocation segments and inhibiting anelastic deformation. BCC metals, on the other hand, have a large Peierls stress that essentially holds dislocation segments in place at low net applied shear stresses and thus allows fully elastic deformation to occur in the complete absence of anelastic behavior. Shock-compression and release experiments have been performed on tantalum (BCC), with the observation that the leading release disturbance is indeed elastic. This conclusion is established by examination of experimental VISAR records taken at the tantalum/sapphire (window) interface in a symmetric-impact experiment which subjects the sample to a peak longitudinal stress of approximately 7.3 GPa, in comparison with characteristic code calculations. [copyright] 1994 American Institute of Physics},
doi = {},
url = {https://www.osti.gov/biblio/6929680}, journal = {AIP Conference Proceedings (American Institute of Physics); (United States)},
issn = {0094-243X},
number = ,
volume = 309:1,
place = {United States},
year = {1994},
month = {7}
}

Conference:
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