Gap Formations in Simulations of SHPB Tests on Elastic Materials Soft in Shear

Abstract

The LS-DYNA code was applied to split Hopkinson pressure bar tests on a material at least two orders of magnitude stiffer in dilatation than in shear. Two constitutive models were applied, linear elasticity and a compressible form of Mooney- Rivlin elasticity. The latter was fitted to data from ballistic gelatin. The incident and transmission bars were aluminum. The nominal strain rate was 2500/s. Gaps appeared at the interfaces between the specimen and both bars. Unloading of the specimen and bars accompanied these gaps. The input-velocity rise time was varied to observe pulse shaping effects. Mesh sensitivity and contact-parameter sensitivity studies were performed.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2009
Accession Number
ADA518966

Entities

People

  • M. J. Scheidler
  • M. N. Raftenberg

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Biomedical
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aluminum
  • Amplitude
  • Bulk Modulus
  • Compression
  • Elastic Materials
  • Elastic Properties
  • Elements
  • Materials
  • Military Research
  • Modulus Of Elasticity
  • Peak Values
  • Sensitivity
  • Shear Modulus
  • Simulations
  • Strain Rate
  • Subatomic Particles
  • Unloading

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Mechanical Engineering/Mechanics of Materials.