Application of a Brittle Damage Model to Normal Plate-on-Plate Impact

Abstract

A brittle damage model presented by Grinfeld and Wright of the U.S. Army Research Laboratory was implemented in the LS-DYNA finite element code and applied to the simulation of normal plate-on-plate impact. The damage model introduces a state variable measure of damage that evolves in proportion to the elastic strain energy. The model degrades the elastic shear modulus in proportion to the state variable's current level. In a simulation of normal plate-on-plate impact, the model produced a gradient in elastic properties within the initially homogeneous target, and this gradient led to a partial reflection of the unloading wave. For a range of values for the material constants introduced by the damage model, the target's free-surface velocity showed a gradual increase over time following the arrival of the initial compressive shock.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2005
Accession Number
ADA441213

Entities

People

  • Martin N. Raftenberg

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Value Problems
  • Cartesian Coordinates
  • Differential Equations
  • Elastic Properties
  • Engineering
  • Equations
  • Free Energy
  • Materials
  • Mechanical Properties
  • Mechanics
  • Military Research
  • Modulus Of Elasticity
  • Physics Laboratories
  • Reflection
  • Shear Modulus
  • Simulations
  • Unloading

Readers

  • Computational Fluid Dynamics (CFD)
  • Materials Science (Mechanical Engineering).