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Difficulty in the experimental determination of the interaction com ponent of strength tensor of boron-epoxy composites by off axis tests is discussed. Although off axis data agree well with the prediction of the strength tensor theory, the uniaxial data cannot be used to back calculate the...
Dynamic elastic moduli and damping of carbon- and graphite-filled epoxy composites have been measured over the temperature range of 85 to 300° K. The epoxy resin matrix was cured with diethylenetriamine. Dynamic elastic moduli increase with filler content in both cases; however, graphite powder...
Initial yield surfaces were constructed for the boron-aluminum com posite under arbitrary combinations of applied composite stresses and tem perature changes, by means of a finite element analysis of a regular hexa gonal array model. The results suggest that with regard to initial yielding, the...
This paper and a subsequent one will present the results of an investiga tion which analytically relates the fiber/matrix nonlinearities to the post- yielding behavior of symmetric laminates made from unidirectional plies. This first paper is primarily concerned with the behavior of the single...
Geometrically similar double edge-notched fracture toughness speci mens of glass reinforced polyester resin were tested and the critical stress intensity factor ( K c ) determined. For a unidirectional fabric reinforcement with the crack positioned parallel to the fibres K c did not depend on...
The concept of fracture mechanics is applied to analyze the brittle fracture of unidirectional composites. The analytical prediction based on the newly developed S c -theory agrees well with the experimental data on Scotchply 1002 where crack propagation occurs along the fiber direction. The S c...
This paper extends the nonlinear behavior of unidirectional laminae of Reference (1) to that of laminated composites. A comparison between the theory and experimental results is shown through the analysis of uniaxial tension behavior of various laminates. The effect on buckling stress owing to...
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