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MICROMECHANICS - COMPRESSIVE PROPERTIES OF FIBER-REINFORCED COMPOSITES.
Technical documentary rept. 15 May 64-15 Apr 65.
WHITTAKER CORP SAN DIEGO CA NARMCO RESEARCH AND DEVELOPMENT DIV
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The objective of this first part of a 2-year program was to investigate the micromechanical behavior of a fiber-reinforced composite under compressive loadings. In order to improve the compressive strength of composites, the interactions between fibers and matrix must be understood. The approach used for the investigation was both experimental and analytical. Material models and composite specimens under load were observed and test results analytically interpreted. Mathematical equations and terms which describe the micromechanical and elastostatic behavior of the constituent material of a fiber-reinforced composite under compressive loading were analyzed. The fracture theory under compressive load has been developed which includes consideration of shear properties and changes of the effective compressive modulus at high strain and low slenderness ratio. Equations which determine the ultimate compressive strength of a composite were established. Several other related problems of interaction between fibers and matrix have been investigated. Author
APPROVED FOR PUBLIC RELEASE