Conclusions
1. An equation has been derived for the strength during interlayer shear along reinforcing fibers of a composite material of unidirectional texture which allows calculation of this index as a function of composition of the material and state of the interphase boundary. Experimental confirmation of this equation has shown that the effectiveness of surface treatment of the reinforcing filler can be estimated by its use.
2. It has been shown that the strength during interlayer shear of an epoxy-phenol plastic can be increased by a factor of more than 3, and during bending by a factor of 1.3, as the result of treatment of high-modulus carbon fibers in nitric acid.
3. A correlation has been established between changes in electrical resistivity of the carbon fiber and the molecular component of adhesion to it of consolidated epoxy-phenol binder.
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Additional information
Moscow. Translated from Mekhanika Polimerov, No. 3, pp. 445–451, May–June, 1977.
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Kobets, L.P., Gunyaev, G.M. Resistance to interlayer shear of plastics on a carbon filament base. Polymer Mechanics 13, 380–385 (1977). https://doi.org/10.1007/BF00859421
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DOI: https://doi.org/10.1007/BF00859421