Anisotropic micromechanical creep damage model for composite materials: A reduced-order approach

Erez Gal, Jacob Fish

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

An anisotropic micromechanical model aimed at characterizing the response of composite material to creep is presented. The constitutive model of microconstituents is based on the Kachanov-Robotnov creep damage model for isotropic materials. An anisotropy of the model is introduced through homogenization, which derives macroscopic properties from micromechanical properties of microconstituents. A reduced-order micromechanical model is formulated to substantially reduce (up to several orders of magnitude) the number of unknowns in the microscopic problem compared to the direct homogenization approach. The reduced-order model is based on the reduced-order homogenization with eigen-strains, which describes the inelastic part of the microscopic displacement field by means of eigen-deformations. An adaptive algorithm has been devised to evaluate the time step needed to ensure solution accuracy. Numerical studies are presented to demonstrate the efficiency of the model.

Original languageEnglish
Pages (from-to)113-121
Number of pages9
JournalInternational Journal for Multiscale Computational Engineering
Volume6
Issue number2
DOIs
StatePublished - 9 Jul 2008

Keywords

  • Anisotropic material
  • Composite material
  • Continuum damage mechanics
  • Creep
  • Eigen-strain
  • Finite element method FEM
  • Homogenization
  • Multi-scale analysis
  • Reduced order model

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computational Mechanics
  • Computer Networks and Communications

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