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 AbstractA 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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