Title page for ETD etd-06232009-063447


Type of Document Master's Thesis
Author Parietti, Lucie
URN etd-06232009-063447
Title Micromechanical finite element model for constitutive elastoplastic analysis of unidirectional fiber-reinforced composites
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Griffin, Odis Hayden Jr. Committee Chair
Hyer, Michael W. Committee Member
Johnson, Eric R. Committee Member
Keywords
  • elastic analysis
Date of Defense 1994-08-01
Availability unrestricted
Abstract
A micro mechanical finite element model to compute the overall instantaneous stiffness of fiber-reinforced

composites in elastic-plastic response is presented. The model is applicable to a periodic

diamond array of elastic circular fibers embedded in an elastoplastic matrix subjected to a plane

stress loading. This model enforces symmetry and anti-symmetry conditions isolating the smallest

unit cell and should greatly increase the speed of doing "built-inn micromechanics within a larger

finite element program because of the small number of degrees of freedom (12 to 14 d.o.f.). The

matrix plastic behavior is modeled using the endochronic theory without a yield surface. Various

off-axis elastoplastic characteristics predicted by the mini grid for a boron/aluminum composite are

presented. Comparison with experimental data and a fine grid finite element solution shows very

good agreement and demonstrates the effectiveness of the mini model presented.

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