4. Using the methods of boundary interpolation and a little parameter decomposition the stress concentration in a material with double periodical system of associated elliptic inclusions was calculated. 5. The formula for the tensile strength determination of quasibrittle materials with great volume content of inclusions was proposed. 6. The comparison the theoretical values of tensile strength for cast-irons with graphite inclusions or the inclusions of phosphide eutectic with the known experimental data were carried out. A close correspondence between them was attained. References 1. Stadnik, M.M. (1988). Soviet Mater. Sci. 24, 1, 49. 2. Cherepanov, G.P. (1979). Mechanics of Brittle Fracture. McGrow-Hill, New York. 3. Stadnyk, M.M. (1985). Dokl. Akad. Nauk UkrRSR. A, 3, 34. (In Ukrainian). 4. Stadnyk, M.M. and Horbachevskyi, I.Y. (1997). Dopov. Nation. Acad. Nauk Ukr. 8, 77. (In Ukrainian). 5. Stadnyk, M.M. (1994). Physicochem. Mech. Mater. 30, 6, 30. (In Ukrainian). 6. Panasyuk, V.V., Andreykiv, A.E. and Stadnik, M.M. (1983). Ibid. 19, 1, 3. (In Russian). 7. Volchok, I.P., Stadnik, M.M., Silovanyuk, V.P. et al. (1984). Ibid. 20, 3, 89. (In Russian).
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