TY JOUR TI ANALYSIS OF HARDNESS TEST METHODS AND PROSPECTS OF IMPROVEMENT KW loading mechanism KW elastic aftereffect KW plastic KW additive tendency KW actual fracture resistance JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Sergiev , A.. AU Makarov, A.V. AU Vladimirov , A.. AU Belov, N.V. PY 2018 IS 3 PB Belgorod State Technological University named after V.G. Shukhov