Rate-dependent spallation properties of tantalum

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Spallation experiments are conducted on high-purity tantalum using VISAR instrumentation for impact stresses of 9.5 GPa and 6.0 GPa. The high-amplitude experiment exhibits very rapid initial spall separation, while the low-amplitude shot is only slightly above the threshold for void growth and thus exhibits distinct rate-dependent spallation behavior. These experiments are analyzed in terms of simple tensile fracture criteria, a standard rate-dependent void-growth model, and a rate-dependent void growth model in which the expected plastic volume strain makes no contribution to the relaxation of the mean stress. Recovery tests and VISAR measurements suggest an additional resistance to spallation that follows ... continued below

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5 p.

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Johnson, J.N.; Hixson, R.S.; Tonks, D.L. & Zurek, A.K. September 1, 1995.

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Description

Spallation experiments are conducted on high-purity tantalum using VISAR instrumentation for impact stresses of 9.5 GPa and 6.0 GPa. The high-amplitude experiment exhibits very rapid initial spall separation, while the low-amplitude shot is only slightly above the threshold for void growth and thus exhibits distinct rate-dependent spallation behavior. These experiments are analyzed in terms of simple tensile fracture criteria, a standard rate-dependent void-growth model, and a rate-dependent void growth model in which the expected plastic volume strain makes no contribution to the relaxation of the mean stress. Recovery tests and VISAR measurements suggest an additional resistance to spallation that follows the rapid coalescence of voids; this effect is termed the secondary spall resistance and is due to the convoluted nature of the spall plane and the resulting interlocking fracture pattern that is developed and for which the stress remains unrelieved until the spall planes have separated several hundred microns.

Physical Description

5 p.

Notes

INIS; OSTI as DE95016898

Source

  • American Physical Society biennial conference on shock compression of condensed matter, Seattle, WA (United States), 13-18 Aug 1995

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  • Other: DE95016898
  • Report No.: LA-UR--95-2471
  • Report No.: CONF-950846--24
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/102226 | External Link
  • Office of Scientific & Technical Information Report Number: 102226
  • Archival Resource Key: ark:/67531/metadc619224

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 29, 2016, 7:13 p.m.

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Johnson, J.N.; Hixson, R.S.; Tonks, D.L. & Zurek, A.K. Rate-dependent spallation properties of tantalum, report, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc619224/: accessed January 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.