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
  • elastic analysis
Date of Defense 1994-08-01
Availability unrestricted
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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