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Spallation in cylinder-plate impact

Computer calculations of the impact velocity necessary to cause spall fracture are compared with the results of ballistic tests and the correlation between theory and experiment is considered good

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Abstract

A combined theoretical-experimental study has been made of spall-type fracture induced in steel plates impacted by blunt cylinders whose diameter is comparable to the plate thickness. Since attention is restricted to normal impact, the problem is two dimensional, involving rotational symmetry.

Analysis of shock-wave patterns induced by impact is achieved by employing a two-dimensional computer program, HEMP, in which the equations of motion are combined with realistic constitutive relations appropriate for the dynamic high-pressure regimes encountered. Experimentally, a series of tests was conducted in which the impact velocity was increased incrementally until penetration occurred. Recovered targets were sectioned and examined for evidence of incipient internal fracture as well as extensive plastic deformation. Correlation with theoretical predictions is considered good.

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Authors and Affiliations

  1. Mechanics Research Laboratory, Army Materials & Mechanics Research Center, 02172, Watertown, MA

    J. Mescall (Research Mathematician) & R. Papirno (Research Mechanical Engineer)

Authors
  1. J. Mescall
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  2. R. Papirno
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Mescall, J., Papirno, R. Spallation in cylinder-plate impact. Experimental Mechanics 14, 257–266 (1974). https://doi.org/10.1007/BF02322829

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  • DOI: https://doi.org/10.1007/BF02322829

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