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Substantiation of design strength indices of cylindrical shells to reduce metal consumption of equipment

As a rule, the minimum required thickness of the cylindrical shell is determined when calculating its strength. However, in many cases, for example, in the design of vacuum equipment, the strength does not give an unambiguous solution, since such a shell may be strengthened by ribs. The more often the ribs are installed, the thinner the shell, but in this case the workability of industrial product deteriorates. It is known that a thin shell of large diameter is difficult to make: the labor intensity of rolling, assembly, sizing, etc. increases. One of the reasons for the increase in labor intensity is that such a shell, in a horizontal position, bends so much under the influence of its own mass that it loses its original cylindrical shape, so it is impossible to calibrate a thin shell on standard horizontal rollers without special devices. The area of perfectly elastic deformations of the shell is considered. In this case, when loaded by gravity and during unloading (for example, when the shell is returned to the vertical position), energy losses are excluded. A simple method of determining the bearing capacity of cylindrical shells and plates in the zone of support and slinging devices is proposed, which does not require knowledge of the form of destruction. As can be seen, the shells have the thickness larger than the design one, so the curves drawn by the formulas may be taken as limiting constraints when assigning the minimum required thickness to the cylindrical shell. These methods will reduce the metal consumption of structures.