TY JOUR TI NUMERICAL MODELING OF COMPOSITE FITTINGS FOR CLUTCHING WITH CONCRETE KW concrete KW fiberglass reinforcement KW adhesion KW digging KW mathematical model KW destruction JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Nikolyukin, A.N. AU Yarcev, V.P. AU Kolomnikova, I.I. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov