STRESS-STRAINE STATE OF THE CYLINDRICAL WALLED PERFORATED SHELLS

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 stress-strain 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 stress-straine state of circle perforating holes and the thickness of the wall. Compared the stress-straine state obtained on solid three-dimensional 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