A COMPOSITE THEORY FOR DIFFUSIVITY OF DISTRESSED MATERIALS

Abstract eng:
This paper describes a new method using composite theories to evaluate the effect of damage on diffusivity of distressed materials. Distressed materials can be considered as a two-phase composite material with the distressed elements as one phase and the original material as the other phase. Then, composite models developed for effective properties of two-phase composites can be used to evaluate the effect of damage on distressed material. The progressive damage can be characterized by the change in volume fraction of the distressed phase. As an example, the diffusivity of distressed materials is evaluated by a two-phase composite model based on generalized self-consistent theory. The methods for determining the model parameters are introduced, and the prediction of the two-phase composite model is compared with the test data. The concept of the two-phase composite theory can be further extended into general multiphase composite theory to evaluate the effect of multilevel damage on effective stiffness and transport properties of materials.

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