Characterization of Recompressed Spall in Copper Gas Gun Targets

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Complementary experiments and simulations are conducted to characterize the microstructure and mechanisms involved in recompression of spalled ductile metals. Soft capture experiments performed on copper targets in a gas gun include a dense secondary plate spaced behind the customary flyer to recompress the voids in the wake of the spall induced by the flyer. Control experiments are run without the secondary plate to obtain spall damage without recompression. The simulations feature explicit representation of void nucleating particles in a narrow strip of material spanning the flyer package and target. Analysis of the spall closure in the simulations reveals the void ... continued below

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PDF-file: 28 pages; size: 1.5 Mbytes

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Becker, R; Cazamias, J & LeBlanc, M August 28, 2006.

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Complementary experiments and simulations are conducted to characterize the microstructure and mechanisms involved in recompression of spalled ductile metals. Soft capture experiments performed on copper targets in a gas gun include a dense secondary plate spaced behind the customary flyer to recompress the voids in the wake of the spall induced by the flyer. Control experiments are run without the secondary plate to obtain spall damage without recompression. The simulations feature explicit representation of void nucleating particles in a narrow strip of material spanning the flyer package and target. Analysis of the spall closure in the simulations reveals the void collapse mechanisms and the origin of features observed experimentally. The experiments and simulations show little trace of the prior voids, and a thin ribbon of highly strained material is the only readily observable remnant of the spall surface.

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PDF-file: 28 pages; size: 1.5 Mbytes

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  • Journal Name: Journal of Applied Physics, vol. 102, n/a, December 3, 2007, pp. 093512-1 to 093512-8; Journal Volume: 102

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  • Report No.: UCRL-JRNL-224017
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 922105
  • Archival Resource Key: ark:/67531/metadc895841

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Office of Scientific & Technical Information Technical Reports

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  • August 28, 2006

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 22, 2016, 10:18 p.m.

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Becker, R; Cazamias, J & LeBlanc, M. Characterization of Recompressed Spall in Copper Gas Gun Targets, article, August 28, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc895841/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.