Implementation of the Johnson-Holmquist II (JH-2) Constitutive Model into DYNA3D

Abstract

This report describes the implementation of a fully three-dimensional rate, pressure, and damage-dependent constitutive model for brittle materials such as ceramics into the explicit, Lagrangian finite element code DYNA3D. The model, otherwise known as the Johnson-Holmquist II (JH-2) ceramic model, has also been implemented into CTH, EPIC, and LS-DYNA, and is used extensively in modelling the brittle response of ceramics in armor applications. The DYNA3D material driver was used to verify the model implementation for constant strain-rate input histories (Johnson, G. R., and T. J. Holmquist. 'An Improved Computational Constitutive Model for Brittle Materials'. High Pressure Science and Technology, New York: AIP Press, 1993). Also described is the implementation of the JH-3 ceramic model and capabilities for modelling projectile dwell phenomena. The Johnson-Holmquist series of ceramic models (JH-1, JH-2, and JH-3) is currently being used in a broader program aimed at computational optimization of composite lightweight armor for Future Combat System vehicles.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2002
Accession Number
ADA402347

Entities

People

  • George A. Gazonas

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Composite Materials
  • Engineering
  • Equations
  • High Pressure
  • Materials
  • Materials Science
  • Mechanics
  • Military Research
  • New York
  • Projectiles
  • Simulations
  • Strain Rate
  • Surface Warfare
  • Three Dimensional
  • Warfare
  • Weapons

Readers

  • Computational Fluid Dynamics (CFD)
  • Mechanical Engineering/Mechanics of Materials.
  • Psychometric Testing or Psychological Assessment.