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Title: THE SPLIT-HOPKINSON PRESSURE BAR: AN EVOLVING QUANTIFICATION TOOL AND TECHNIQUE FOR CONSTITUTIVE MODEL VALIDATION

Abstract

No abstract prepared.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
788232
Report Number(s):
LA-UR-01-5615
TRN: US200202%%249
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Oct 2001
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; VALIDATION; COMPUTER CODES; MATHEMATICAL MODELS; CALCULATION METHODS

Citation Formats

G. T. GRAY. THE SPLIT-HOPKINSON PRESSURE BAR: AN EVOLVING QUANTIFICATION TOOL AND TECHNIQUE FOR CONSTITUTIVE MODEL VALIDATION. United States: N. p., 2001. Web.
G. T. GRAY. THE SPLIT-HOPKINSON PRESSURE BAR: AN EVOLVING QUANTIFICATION TOOL AND TECHNIQUE FOR CONSTITUTIVE MODEL VALIDATION. United States.
G. T. GRAY. Mon . "THE SPLIT-HOPKINSON PRESSURE BAR: AN EVOLVING QUANTIFICATION TOOL AND TECHNIQUE FOR CONSTITUTIVE MODEL VALIDATION". United States. doi:. https://www.osti.gov/servlets/purl/788232.
@article{osti_788232,
title = {THE SPLIT-HOPKINSON PRESSURE BAR: AN EVOLVING QUANTIFICATION TOOL AND TECHNIQUE FOR CONSTITUTIVE MODEL VALIDATION},
author = {G. T. GRAY},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2001},
month = {Mon Oct 01 00:00:00 EDT 2001}
}

Conference:
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  • The results of compressive high strain-rate experiments on compacted sand are presented. Experiments were conducted on a 60.3 mm split Hopkinson pressure bar (SHPB). The experiments showed that the assumptions necessary for a valid SHPB experiment are satisfied when using compacted sand samples constrained to a nearly uniaxial strain state. Results show that the sample stress-strain response is governed principally by the initial sample gas porosity, and that no strain-rate dependence is exhibited at sample strains less than the initial gas porosity. Several stress-strain curves are presented for samples prepared at several combinations of moisture content and density with appliedmore » stresses and strain rates up to 520 MPa and 4000 sec/sup -1/, respectively.« less
  • We developed a split Hopkinson bar technique to evaluate the performance of accelerometers that measure large amplitude pulses. A nondispersive stress pulse propagates in an aluminum bar and interacts with a tungsten or steel disc at the end of the bar. We measure stress at the aluminum bar-disc interface with a quartz gage and measure acceleration at the free end of the disc with an accelerometer. The rise time of the incident stress pulse in the aluminum bar is long enough that the response of the disc can be approximated closely as rigid body motion; an experimentally verified analytical modelmore » supports this assumption. Since the cross-section area and mass of the disc are known, we calculate acceleration of the rigid disc from the stress measurement and Newton`s Second Law. Comparisons of accelerations calculated from the quartz gage data and measured acceleration data show excellent agreement for acceleration pulses with the peak amplitudes between 20,000 and 120,000 G (1 G = 9.8 1m/s{sup 2}) rise times as short as 20 {mu}s, and pulse durations between 40 and 70 {mu}s.« less
  • Abstract not provided.
  • Abstract not provided.