Abstract
It was found that the lengths of fibre fragments in a test CMF are distributed in a wide range of values that differ by ten times and more. The scattering is more important for the bimodal distribution characteristic of untreated carbon fibre. The use of fragments of average length formed on completion of fragmentation of the fibre in assessing adhesion as the critical length results in overstated results. The extrapolation method of determining the strength of fibres of the critical length is an additional source of errors. It is recommended that the length of fragments corresponding to the beginning of failure of adhesion be used as the critical length for assessing adhesion. In this case, the strength of fragments with an average length of lcr=lc can be determined directly in the CMF test; the calculated adhesive strength approaches the shear strength of real composites; it is then possible to study the adhesion of high-strength fibres to brittle matrices. A method of plotting the strength distribution of fragments formed in the test CMF is proposed.
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Uvikom TOO, Mytishchi. Translated from Khimicheskie Volokna, No. 2, pp. 39–44, March–April, 1996.
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Korabel'nikov, Y.G., Rashkovan, I.A. How to assess adhesion with the results of tests of composites with a single monofilament. Fibre Chem 28, 98–103 (1996). https://doi.org/10.1007/BF01058284
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DOI: https://doi.org/10.1007/BF01058284