Abstract

When the profile of polyheteroarylene fibers of an initial round cross-section is trans-formed into a polygonal form, a considerable change in fibre strength takes place, associated with the extent of profiling and the final form of the fibres, at essential invariance in the elastic modulus. The change in relative area of inter-fibre contact area in a jointly profiled package of fibres has an S-shaped character, which determines the shear strength of maximally reinforced organic resin-fibre composites. An extreme dependence of strength under tension on reinforcement coefficient has been found for such composites which are based on jointly profiled fibres.

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