Title page for ETD etd-02062013-040025
|Type of Document
||Lhotellier, Frederic C.
||Matrix-fiber stress transfer in composite materials elasto-plastic model with an interphase layer
||Master of Science
||Engineering Science and Mechanics
|Brinson, Halbert F.
|Dillard, David A.
|Wightman, James P.
|Date of Defense
The matrix-fiber stress transfer in glass/epoxy composite materials was studied using analytical
and experimental methods. The mathematical model that was developed calculates the stress fields
in the fiber, interphase, and neighboring matrix near a fiber break. This scheme takes into account
the elastic-plastic behavior of both the matrix and the interphase, and it includes the treatment of
stress concentration near the discontinuities of the fibers. The radius of the libers and the mechanical
properties of the matrix were varied in order to validate the mathematical model. The
computed values for the lengths of debonding, plastic deformation, and elastic deformation in the
matrix near the fiber tip were confirmed by measurements taken under polarized light on loaded
and unloaded single fiber samples. The fiber-fiber interaction was studied experimentally using
dog-bone samples that contained seven libers forming an hexagonal pattern.
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