Finite cavity expansion method for near-surface effects and layering during earth penetration

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A finite spherical cavity expansion technique is developed to simulate the loading on projectiles penetrating geologic media. Damaged Mohr-Coulomb plasticity models and general pressure-dependent damaged plasticity models are used with incompressible kinematics to approximate a wide range of targets. The finite cavity expansion approximation together with directional sampling reasonably captures near surface and layering effects without resort to ad hoc or empirical correction factors. The Mohr-Coulomb models are integrated exactly to provide a very efficient loading algorithm for use with conventional implicit or explicit finite element structural analysis. The more general constitutive model requires numerical integration and leads to a ... continued below

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7 p.

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Macek, R.W. & Duffey, T. September 1, 1998.

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A finite spherical cavity expansion technique is developed to simulate the loading on projectiles penetrating geologic media. Damaged Mohr-Coulomb plasticity models and general pressure-dependent damaged plasticity models are used with incompressible kinematics to approximate a wide range of targets. The finite cavity expansion approximation together with directional sampling reasonably captures near surface and layering effects without resort to ad hoc or empirical correction factors. The Mohr-Coulomb models are integrated exactly to provide a very efficient loading algorithm for use with conventional implicit or explicit finite element structural analysis. The more general constitutive model requires numerical integration and leads to a more computationally intensive procedure. However, subcycling is easily implemented with the numerical integration and thus an efficient loading method is readily achieved even for large complex simulations using explicit finite element analysis. The utility of the finite cavity expansion approach is demonstrated by comparison of simulations to measured test data from projectiles penetrating rock and soil targets.

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7 p.

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OSTI as DE98006288

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  • International symposium on impact and penetration problems (ICES), Atlanta, GA (United States), 5-9 Oct 1998

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  • Other: DE98006288
  • Report No.: LA-UR--98-1178
  • Report No.: CONF-981030--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 674573
  • Archival Resource Key: ark:/67531/metadc710622

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  • September 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • March 2, 2016, 1:11 p.m.

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Macek, R.W. & Duffey, T. Finite cavity expansion method for near-surface effects and layering during earth penetration, article, September 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc710622/: accessed June 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.