Abstract
The effect of carbon nanotubes on the elastic-strength properties of epoxy resin and carbon plastic was investigated. The epoxy resin in the form of Etal Inject-T compound, Sigratex KDK carbon fabric,Taunit-M carbon nanotubes conditionally named as CNT-1, as well as functionalized (modified) variety of them by grafting to the surface of new chemical groups: carboxylated - CNT-2, carboxyl-hydroxylated - CNT-3, amidated - CNT-4 were used in the work. The injection of CNT - 1 into epoxy resin or carbon fiber reinforced plastic did not produce the hardening. At a strain rate of up to 20 mm/min, the epoxy resin with CNT-2-4 consisting of three zones, practically does not affect the elastic zone, but it strengthens the plastic and elastic-plastic zones. It is established that at the strain rate ≥ 20 mm/min the three-zone structure of the epoxy resin passes into a single-zone deformation with parameters σy = 110.5 MPa, εy = 5.05%, E = 2.15 GPa. Under the same conditions of the rate of deformation of carbon fiber reinforced plastic, zones of elastic, elastic-plastic and pseudoelastic deformation are observed. With an increase in the strain rate of 20 mm/min, the single-zone pseudoelastic deformation is characterized by the parameters σs = 425 MPa, εs= 2.3%, Eef = 19.3 GPa. The injection of carbon nanotubes CNT-2-4 into carbon fiber reinforced plastic increased the compressive strength by CNT-2 - 6% of CNT-3 - 12%, CNT-4 - 17%, modulus of elasticity by 13-20%.