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Porous short fiber reinforced composites : full-field implementation and evaluation of several homogenization strategies

Demey, Julien
(2019)

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Details

Supervisors
Doghri, Issam ; Naili, Chiheb
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil mécanicien
Abstract
This master thesis deals with the evaluation of several homogenization methods for short-fiber reinforced composites (SFRC) using micro-mechanical modeling. By means of several numerical homogenization schemes we computed the macroscopic response of the material to compare and evaluate the best modeling strategy against reference full-field finite elements (FE) simulations on unit cells. Firstly we studied the homogenization of porous unidirectional (UD) SFRCs using three FE models : RVE, UD unit cell and a two-level decomposition of the unit cell. Secondly we considered porous misaligned SFRCs and investigated three homogenization approaches : a direct FE homogenization using an RVE, a two-step method in which the first step is based on FE homogenization of the porous UD unit cell and the second step performed with three homogenization schemes : either Voigt, Reuss or a method inspired by the Mori-Tanaka model using only FE results, and finally we coupled the two-step method with a two-level decomposition of the porous UD pseudo-grain during the first step of the procedure. Results from two-step method using direct FEA of three-phase pseudo-grains (PGs) and FE-MT shows better agreement with RVE reference results. Only linear elasticity is considered in the present work. We used Python scripts to generate the models in the FE solver Abaqus (2019) and post-process the macro response of the material.