Conclusions
1. Actual stresses in reinforcement fibers of a loaded composite have been measured by infrared spectroscopy.
2. It has been shown that the plain rule of mixtures, not accounting for changes in mechanical properties of the matrix during processing of a composite, does not apply to a hot molded polyethylene-polypropylene composite.
3. It is suggested that around the reinforcement fibers there exists an ordered layer of the matrix material capable of carrying a heavy load. A method is proposed, furthermore, for calculating the mechanical characteristics of the composite with such a layer. The volume fraction and the thickness of this hardened layer have been estimated from experimental data.
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Additional information
A. F. Ioffe Physicotechnical Institute, Academy of Sciences of the USSR, Leningrad. Translated from Mekhanika Polimerov, No. 5, pp. 832–837, September–October, 1977.
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Regel', V.R., Gabaraeva, A.D., Filippov, N.N. et al. Measuring the stresses in fibers of a loaded composite material by the method of infrared spectroscopy. Polymer Mechanics 13, 696–701 (1977). https://doi.org/10.1007/BF00860320
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DOI: https://doi.org/10.1007/BF00860320