Study of the elastic-plastic state of cyclically loaded shells of revolution

1.	The described general method of designing structural elements (a type of thin nonsloping shell of revolution) under cyclic loading, which has been approved for the case of a spherical notched shell, is effective, and can also be employed for other types and shapes of thin-wall designs of constant or variable thickness.
2.	Stabilization of the stress state during cyclic loading is heavily dependent on the applied-loading rate and occurs (according to the results of the design and experiments under consideration) during the 2–10th loading cycle for a load range of 10q25 kg/cm2.
3.	As the loading in the shell increases, the stress concentration diminishes from a value k=3.5, which corresponds to the elastic state, to 1.3 at which point the strain concentration reaches a maximum value with q=15 kg/cm2 for the material in question, and then decreases; this is associated with the transition of the shell into the plastic state. These results can be used to evaluate the low-cycle strength of standard structural elements, and to determine the factors of safety and the bearing capacity under cyclic loading.