Implementation of the Nonlinear Composite Analysis Code "LAMPAT" into LLNL-DYNA3D

Abstract

The nonlinear composite analysis code "LAMPAT" is implemented in the nonlinear explicit finite element code LLNL-DYNA3D as a new user-defined material model. All subroutines of LAMPAT are implemented as user-defined Material Model 46. The user-defined material subroutine calls an external data base file that contains material properties for several composites. In addition, LAMPAT is modified for use in an explicit time-integration solver. The model is improved to account for loss of symmetry of the material stiffness matrix resulting from degradation of the elastic moduli during damage evolution. The model implementation is validated through a one-element simulation and penetration simulations. In addition, comparing the prediction of the LSDYNA elastic material model with that of LAMPAT validates the implementation.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2002
Accession Number
ADA408759

Entities

People

  • Ala Tabiei
  • George A. Gazonas

Organizations

  • Oak Ridge Institute for Science and Education

Tags

DTIC Thesaurus Topics

  • Algorithms
  • Composite Materials
  • Computer Programs
  • Databases
  • Elastic Materials
  • Equations
  • Geometry
  • Graphitic Materials
  • Materials
  • Micromechanics
  • Military Research
  • Procedures (Computers)
  • Simulations
  • Stiffness
  • Strain Rate
  • Symmetry
  • Three Dimensional

Readers

  • Computational Fluid Dynamics (CFD)
  • Medical or Health Care Field.
  • Reinforced Composite Materials