Micromechanics of Oxidation in Composites with Impermeable Fibers
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abstract
This article describes an approach to determine effective oxidation material properties for a unidirectional laminate or tow. The effective properties will ultimately be used to model the oxidation behavior of textile composites. It is necessary to use homogenized properties for the tow because it is impractical to discretely model all the fibers in a composite. The basic oxidation model is taken from existing work in the literature, which was used to simulate the oxidation behavior of neat PMR-15 resin. The governing equations and the finite element formulation for the model are described as well as approaches for determining the various effective properties. Three configurations were analyzed to test the accuracy of the effective oxidation properties. The configurations were discretely modeled to provide a reference solution. Different idealizations were tested in order to determine the accuracy of the effective properties. The configurations included fully homogenized idealizations as well as mixed idealizations which have a combination of both homogenized and discretely modeled regions. The concentration of oxygen in the model as well as the oxidation state of the materials in the composite are compared to the reference model. The effective oxidation properties performed reasonably well for the three configurations in terms of predicting the oxidation layer growth.
