Issue 41

E. Nurullaev et alii, Frattura ed Integrità Strutturale, 41 (2017) 369-377; DOI: 10.3221/IGF-ESIS.41.48 373 N UMERICAL EXPERIMENTATION ab. 1 presents optimized parameter values of silica fraction mixtures in the PCM which are calculated using computer program being developed by the authors [8]. Numerical experiments are carried out for: ν ch = 3 mol/m 3 , which is chosen according to predesigned as most effective one. Plasticizer volume fractions in the polymer binder are chosen in form of three values 0.05; 0.1; 0.3 to provide development of the PCM with low viscosity. The last one is required for good component mixing. Tab. 2 presents data required for numerical experimentation . Table 1 : Optimum parameter values of silica fraction mixtures. Fraction quantity 2; 3; 4 Experiment temperature, К 223; 273; 323 Glass transition temperature of the polymer 1 (isoprene of IR grade) К 200 Glass transition temperature of the polymer 2 (butadiene of BR grade), К 178 Molecular weight of the polymer 1 (isoprene of IR grade) 372802 Molecular weight of the polymer 2 (butadiene of BR grade) 198775 Density of the polymer 1 (isoprene of IR grade) kg/m 3 900 Density of the polymer 2 butadiene of BR grade) kg/m 3 890 Volume fraction of the polymer 1 (isoprene of IR grade) in the binder 0.7; 0.65; 0.5 Volume fraction of the polymer 2 (butadiene of BR grade) in the binder 0.25; 0.25; 0.2 Volume fraction of the filler 0.75 Chemical bond density, mol/m 3 3 Design glass transition temperature of the rubber, К 192.3 Molecular weight of the plasticizer (plasticizing oil of MPA grade) 1010 Glass transition temperature of the plasticizer, К 169 Density of the plasticizer, kg/сm 3 890 Volume fraction of the plasticizer 0.05; 0.1; 0.3 Table 2 : Data required for numerical experimentation. Tab. 3 presents numerical experimentation results about dependence of rupturing stress from rupturing deformation of the PCM depending on plasticizer volume fractions in the binder from 0.05 to 0.3 vol. fraction , on filler fraction T Fraction number Particle diameter, ϻ Void volume ratio Optimum values of fraction volume ratio Maximum volume filling Two fractions 1 15 0.386 0.2 0.84 2 600 0.244 0.8 Three fractions 1 1 0.465 0.05 0.94 2 15 0.386 0.149 3 600 0.244 0.801 Four fractions 1 1 0.465 0.028 0.96 2 15 0.386 0.082 3 240 0.367 0.226 4 600 0.244 0.664