Stochastic aspects of matrix cracking in brittle matrix composites

Article Abstract:

The multiple cracking in fiber-reinforced brittle matrix composites, with stress on the matrix flaw distribution, is simulated on a computer. The effect of bridging fibers on the required stress for cracking is incorporated into the computer simulations. The simulations also include the crack interaction effects. The spatial distribution of matrix cracks is controlled by the distribution of matrix flaws. The stochastic aspects of matrix cracking are relevant to the function of the distribution of matrix flaws.

Brittleness

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Oxidation induced stress-rupture of fiber bundles

Article Abstract:

The tensile strength distributions of fiber bundles which are used in making fibrous composites were analyzed by determining the effects of oxidation on the stress-rupture behavior of fiber bundles. The study showed that fiber stress and bundles strain decreased with time. Furthermore, fiber failure could be attributed to the increase in stress and temperature during a fiber oxidation process and the loss in fiber strength was thermally dependent on the mechanism responsible in the oxidation of the fibers.

Fatigue (Materials), Stresses (Materials), Oxidation-reduction reaction, Oxidation-reduction reactions, Fibers, Fibrous composites, Stress relaxation (Materials)

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Finite element simulations of fiber pull-out

Article Abstract:

The quasi-static analysis of a circular elastic cylinder that has a rigid cylindrical fiber in its center is used for fiber pull-out simulation. The rate dependent internal variable friction constitutive relation is used in the characterization of the interface between the fiber and the matrix. The investigation is performed by the simulation of the residual stresses that form during the cooling of the cylinder, and by the mechanical response simulation during fiber pull-out.

Fracture mechanics

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