Penetration of rod projectiles in semi-infinite targets : a validation test for Eulerian X-FEM in ALEGRA.

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The finite-element shock hydrodynamics code ALEGRA has recently been upgraded to include an X-FEM implementation in 2D for simulating impact, sliding, and release between materials in the Eulerian frame. For validation testing purposes, the problem of long-rod penetration in semi-infinite targets is considered in this report, at velocities of 500 to 3000 m/s. We describe testing simulations done using ALEGRA with and without the X-FEM capability, in order to verify its adequacy by showing X-FEM recovers the good results found with the standard ALEGRA formulation. The X-FEM results for depth of penetration differ from previously measured experimental data by less ... continued below

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61 p.

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Park, Byoung Yoon; Leavy, Richard Brian & Niederhaus, John Henry J. March 1, 2013.

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Description

The finite-element shock hydrodynamics code ALEGRA has recently been upgraded to include an X-FEM implementation in 2D for simulating impact, sliding, and release between materials in the Eulerian frame. For validation testing purposes, the problem of long-rod penetration in semi-infinite targets is considered in this report, at velocities of 500 to 3000 m/s. We describe testing simulations done using ALEGRA with and without the X-FEM capability, in order to verify its adequacy by showing X-FEM recovers the good results found with the standard ALEGRA formulation. The X-FEM results for depth of penetration differ from previously measured experimental data by less than 2%, and from the standard formulation results by less than 1%. They converge monotonically under mesh refinement at first order. Sensitivities to domain size and rear boundary condition are investigated and shown to be small. Aside from some simulation stability issues, X-FEM is found to produce good results for this classical impact and penetration problem.

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61 p.

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  • Report No.: SAND2013-1863
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 1088058
  • Archival Resource Key: ark:/67531/metadc844393

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 2013

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • June 17, 2016, 3:23 p.m.

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Park, Byoung Yoon; Leavy, Richard Brian & Niederhaus, John Henry J. Penetration of rod projectiles in semi-infinite targets : a validation test for Eulerian X-FEM in ALEGRA., report, March 1, 2013; United States. (digital.library.unt.edu/ark:/67531/metadc844393/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.