TY JOUR TI AN INFLUENCE OF TEST CONDITIONS ON STRUCTURAL CHANGES OF RUBBER MEMBRANES BASED ON AMORPHOUS AND CRYSTALLINE POLYMERS KW rubber membranes KW complex stress state KW indentation KW amorphous rubbers KW crystallizing rubbers JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Kudelin, D.V. AU Nesiolovskaya, T.N. AU Vetoshkin, A.B. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov