Stress-strain state research of fastener in hydraulic turbine flanged connections

• Main Authors: Гнитько, В. И., Полищук, О. Ф., Черкасский, А. Ю., Ильичева, Н. А., Артемова, С. В., Кононенко, Е. С.
• Format: Article
• Language: Russian
• Published: Journal of Mechanical Engineering 2017
• Subjects: flange connection; prestressed; static and dynamic loading; finite element method; УДК 539.3; фланцевое соединение; предварительное затягивание; статическая и динамическая нагрузка; метод конечных элементов; фланцеве з’єднання; попереднє затягування; статичне і динамічне навантаження; метод скінченних елементів
• Online Access: https://journals.uran.ua/jme/article/view/96736

The technique for numerical analysis of the stress-strain state of the main massive load-bearing fastening the hydraulic turbine equipment with Kaplan runner under static and dynamic loading is developed. The flanged connection operation modeling is reduced to formulation of the contact problem of the bolt–flanges interaction. The finite-element program modules to estimate static and forced vibrations are constructed. The numerical investigations of the static and dynamic stress-strain state of the load-bearing bolted connections for hydraulic turbine ПЛ40–В–700: turbine shaft – runner, turbine shaft – generator shaft, blade – runner have been performed. The tests for cycle fatigue of cylindrical test-pieces of steel grade 25Х1МФ used for manufacture of fasteners are accomplished in the modes of tension–compression and symmetric bending. The fatigue curves for strain-compression and bending of the test-pieces made of steel grade 25Х1МФ are obtained. At the fatigue test in tension-compression mode the number of cycles to failure of the sample is less significant compared with the test on a flat symmetrical bending under the same stresses.