Aerospace Composite Materials: Delivery Order 0002: Development and Validation of Micromechanical Models for Composites

TL;DRAbstract

Mechanics modeling and verification of a variety of systems continues to be examined. Systems successfully examined include the single filament cruciform test, identification of failure modes in composites, woven fabric composite, carbon foams, the fiber pushout test, and slanted free-edge plies. Techniques used include concentric cylinder modeling, finite element method, B-spline approximation, and in situ observation of damage during testing via scanning electron microscopy (SEM). The iteration method was found to be superior to the Fourier transform method of modeling inhomogeneous composites except where an analytical solution is required. This knowledge was then applied to functionally graded materials and to computer-generated models of locally nonuniform composites. The radial distribution function for fiber locations and second-order intensity functions are needed to predict properties beyond estimating their bounds.

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