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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