Split-Hopkinson pressure bar tests on pure tantalum

Journal Article · Fri Jul 10 04:00:00 EDT 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.55549· OSTI ID:21185648

Dick, Richard D ^[1]; Armstrong, Ronald W ^[2]; Williams, John D ^[3]

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1. Shocks Unlimited, 9737 Academy Rd., NW, Albuquerque, New Mexico 87114 (United States)
2. Mechanical Engineering, University of Maryland, College Park, Maryland 20742 (United States)
3. Talbot Laboratory, University of Illinois, Urbana, Illinois 61801 (United States)

Pure tantalum (Ta) was loaded in compression by a split-Hopkinson pressure bar (SHPB) to strain rates from 450 to 6350 s{sup -1}. The results are compared with SHPB data for commercial Ta and with predictions from the constitutive model for Ta developed by Zerilli and Armstrong (Z-A). The main conclusions are: (1) the flow stress versus log strain rate agree with the Z-A constitutive model and other reported data, (2) uniform strain exponents computed on a true stress-strain basis for pure Ta are somewhat greater than those determined from SHPB data for commercial Ta, and (3) in both cases the uniform strain exponents versus log strain rate are in good agreement with predictions from the Z-A constitutive model for strain rates above 1500 s{sup -1} without a clear indication of dislocation generation.

• OSTI ID: 21185648
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 429; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPRESSION
DISLOCATIONS
FLOW STRESS
IMPACT TESTS
MATHEMATICAL MODELS
PLASTICITY
PRESSURE DEPENDENCE
STRAIN RATE
STRAINS
TANTALUM