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FIBER-REINFORCED METALS AND ALLOYS
IIT RESEARCH INST CHICAGO ILL
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Fiber felts prepared from short, kinked metal fibers were impregnated with weaker metals. The average concentrations of fibers in matrix metal were 10 to 50 vol-. It was found that the felting operation itself markedly influenced the mechanical properties of the composites. The fiber diameter also had distinct effects on the degree of reinforcement. In all cases the strength of the composites are directly related to the interfiber spacings and, until some critical value of this parameter is reached, there is very little reinforcement of the matrix by fibers. The incorporation of brittle fibers in a ductile matrix generally results in decrease in elongation and notch-toughness. The experimentally measured elastic moduli compare favorably with values predicted from the theory of elasticity. The degree of reinforcement of matrix by fibers of identical lengths and diameters depends upon the nature of the fibers. Author
APPROVED FOR PUBLIC RELEASE