Search

Deformed carbon fibers are investigated, and their failure model is proposed based on the Sierpinski set and the hypothesis of two — brittle and viscous — fracture modes, whose existence is confirmed by examples of a correlation between the mechanical strength and elastic modulus of the fibers. For the first time, a multifractal diagram is obtained, which allows one to justify the classification of carbon fibers into brittle and inelastic ones.

1. The microheterophase structure of the epoxy-phenol matrix formed by molecularly disperse (MM) and colloidally disperse (MDP) phases with a particle size of 0.05–1μm and larger was studied. 2. Particles of MDP form structures under the effect of the filler which are similar to liquid crystalline structures (smectic or nematic types) and are stable in a certain range of curing temperatures. 3. Identification of the maxima of tanδ caused by molecular mobility in microvolumes of MDP and PM and kinetic equations which describe the curing processes in different microphases are proposed.