A Continuum Model for Viscoelasticity, Damage, and Permanent Deformation with Application to Swirl-Mat Polymeric Composites.

Abstract

A comprehensive thermodynamic framework is proposed for modeling the behavior of polymeric composites exhibiting viscoelasticity, damage and permanent deformation. In the present formulation, the total strain is decomposed into viscoelastic and permanent components. The effect of damage on the constitutive behavior is introduced through direct coupling between damage and the internal state variables representing deformation of the undamaged (virgin) material. This approach accounts for time-dependent damage as well as damage-induced changes in material symmetry. The viscoelastic part of the proposed constitutive model is first formulated for a general case of damage coupled with nonlinear viscoelasticity, and subsequently specialized to coupling with linear viscoelasticity. Permanent deformations are discussed in view of recent experimental findings. Finally, the proposed constitutive model is applied to experimental data for swirl-mat polymeric composites.

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Document Details

Document Type
Technical Report
Publication Date
Jul 12, 1996
Accession Number
ADA311377

Entities

People

  • K. Abdel-tawab
  • Y. Weitsman

Organizations

  • University of Tennessee

Tags

DTIC Thesaurus Topics

  • Composite Materials
  • Couplings
  • Determinants (Mathematics)
  • Experimental Data
  • Materials
  • Symmetry
  • Viscoelasticity

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Dynamics.
  • Theoretical Analysis.