The paper presents the experimental and theoretical study of the behavior of fracture of the composite based on ED-20 epoxy-diane resin filled with nanoparticles of silicon dioxide Tarkosil. The composite is modeled as a three-phase continuum: epoxy adhesive, the nanopowder and air bubbles. The elastic moduli and Lame coefficients have been determined as a function of various concentrations of the nanopowder. Experiments have shown that doping by Tarkosil (up to 12%) increases Young modulus by 23%. Concentrations of the nanosized powder of silicon dioxide in excess of 12% deteriorate the strength and elasticity of the epoxy composite because of the high concentration of air bubbles.
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