English

DTIC ADA292027: Three Dimensional Effects in Fiber Reinforced Composites Under Compression.

This article demonstrates that the stress and displacement fields in composites reinforced by hexagonal fiber arrays differ both qualitatively and quantitatively from results obtained for fiber and matrix layers. The layered representation is a commonly used approximation for analyzing the compressive response of composites. Finite element computational results are presented for the mechanical fields in uni-axially reinforced fibrous composites subjected to compression parallel to the fiber direction. The fibers are assumed to deflect in a shearing mode deformation and both linear and non-linear responses are considered for the matrix material. The results exhibit a pronounced three dimensional character, with significant stress concentrations near the fiber/matrix interfaces and shear stresses T sub yz of magnitudes equivalent to those of T sub xz. All these features are disregarded by the layered model and may account for its inadequacy in predicting compressive failure. (MM)

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