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International Journal for Multiscale Computational Engineering
IF: 1.016 5-Year IF: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Print: 1543-1649
ISSN Online: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v6.i2.10
pages 113-121

Anisotropic Micromechanical Creep Damage Model for Composite Materials: A Reduced-Order Approach

Erez Gal
Department of Structural Engineering, Ben-Gurion University, Beer-Sheva, 84105, Israel
Jacob Fish
Civil Engineering and Engineering Mechanics, Columbia University, New York, New York 10027, USA

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.


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