Authors & Affiliations
Petrunin V.V., Vilensky O.Yu., Lapshin D.A., Malygin M.G.
Afrikantov Experimental Design Bureau for Mechanical Engineering, Nizhny Novgorod, Russia
Petrunin V.V. – First Deputy General Director, First Deputy General Designer, Dr. Sci. (Tech.), Afrikantov Experimental Design Bureau for Mechanical Engineering.
Vilensky O.Yu. – Head of department, Cand. Sci. (Tech.), Afrikantov Experimental Design Bureau for Mechanical Engineering.
Malygin M.G. – Head of design group, Afrikantov Experimental Design Bureau for Mechanical Engineering.
There are the following mechanical processes which are used as a rule for structural damping: impact energy absorption by inelastic resistance (significant plastic deformation) of the deformed construction element material, and impact energy absorption by the friction work in joints of elements. It is computational modeling which is used to develop damping device design. In modern software packages (ANSYS, LS DYNA) there is full-scale mathematical 3D modeling that enables to make a deep and detailed analysis of dynamic processes. Computational and experimental research methods are used to construct and test mathematical models from LS-DYNA library (Jonson-Cook models, Allen, Rule&Jones model, Cowper-Symonds model), which describe the behavior of materials under shock loading.
A few examples are given to show computational methods which prove efficiency of a few types of damping devices used in construction of nuclear power plants. Comparative analysis is carried out using calculation results obtained with ANSYS/LS-DYNA PC and results of available experimental data. A conclusion is drawn that computational methods can prove the efficiency of damping devices only in case that there is true data of damping characteristics which can be obtained as a result of experimental study of model constructions.
It is shown that installation of damping devices is an effective means to reduce dynamic loads on the equipment of nuclear power plants and it allows localizing the zone of dynamic impact. If there is a set of necessary conditions then the usage of computational methods to evaluate efficiency of damping devices at a design stage allows avoiding expensive full-scale tests and helps to increase competi-tiveness of products due to lowering their prime cost.
dynamic processes, structural damping, plastic deformation, friction, software package, impact energy, deformation model, verification
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