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УДК 539.3

Яхно Б.О. к.т.н. доц. ,Трубачев С.И. к.т.н. доц.
НТУУ «Киевский политехнический інститут», г. Киев, Украина


Yakhno B., Trubachev S.
National Technical University of Ukraine «Kyiv Polytechnic Institute», Kyiv, Ukraine



Abstract. In the article was discussed the problem of the stress determination in thick-walled cylinders. This task type is used for strength analyse of nuclear power plant equipment, for example - steam generator. Analytical solution for axial-symmetric construction parts was discussed. The perforation holes make geometrical inhomogeneity of structure, so numerical solution was find in solid and shall formulation. Equivalent rigidity of the shall don’t account a stress concentration from holes. This fact was shown on fig.4b. It’s necessary to use solid (3D) geometrical task formulation to calculate stress concentration level. The stressstrain
state of thick-walled cylindrical perforated shell under internal pressure is consider. Defined the reduced stiffness of the shell by defining an equivalent thickness. A numerical calculation using solid (3D) and shell finite elements is done. Analyzed stressstraine state of circle perforating holes and the thickness of the wall. Compared the stress-straine state obtained on solid threedimensional model with the results for a shell with equvivalent stiffness. Were given advice on the definition of strass-straine state by using the eqvivalent stiffness considering stress concentration.
Keywords: equvivalent stiffness, perforated shall, cylindricall shall, stress concentration.


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