Toughening of Heterogeneous Ceramics
Final technical rept. 15 Feb 95-30 Sep 98
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIENCE AND MECHANICS
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The goal of this program is to develop accurate micromechanical models of the damage mechanisms in fiber-reinforced composites, so as to provide predictive models of macroscopic composite behavior. Such predictive models clearly highlight the key controlling mechanisms of various stages of deformation and to quantitatively relate the constitutive properties of the fibers, matrix, and interface to the overall deformation of the composite. The understanding gained through such predictive models is then useful for optimizing material design and properties for various composite applications and for providing a baseline for studying issues such as composite degradation due to creep and time-dependent damage. Here, we summarize our progress in understanding three different phenomena in fiber-reinforced composites the tendency of matrix cracks to deflect at a fibermatrix as a function of the fiber and matrix elastic properties and the fiber and interface toughnesses prediction of the stress-strain behavior of a ceramic composite as a function of elastic and stochastic strength properties of the fibers and matrix and the dependence of tensile strength on fiber load transfer, including the size-scaling of strength.
- Ceramics, Refractories and Glass