Accession Number : ADA292027

Title :   Three Dimensional Effects in Fiber Reinforced Composites Under Compression.

Descriptive Note : Technical rept. 1 Oct 92-2 Feb 95,

Corporate Author : TENNESSEE UNIV KNOXVILLE DEPT OF ENGINEERING SCIENCE AND MECHANICS

Personal Author(s) : Xu, S. ; Weitsman, Y. J.

PDF Url : ADA292027

Report Date : 02 FEB 1995

Pagination or Media Count : 27

Abstract : 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)

Descriptors :   *FIBER REINFORCED COMPOSITES, COMPRESSION, STRESS STRAIN RELATIONS, STRESS ANALYSIS, FINITE ELEMENT ANALYSIS, DEFORMATION, DISPLACEMENT, ELASTIC PROPERTIES, DEFLECTION, GRAPHITE, MATRIX MATERIALS, THREE DIMENSIONAL, FAILURE(MECHANICS), AXIAL LOADS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE