Nonlinear bending and stability of ellipsoidal reverse buckling disks being under the liquid pressure and temperature
UDC
539.37EDN
ZHXFLXAbstract
The nonlinear bending and stability of reverse buckling disks have been studied. The reverse buckling disks represent the oblate ellipsoidal shells being under the pressure of the heated or cooled compressed working environment on the convex side of the shells. We have obtained the numerical results depending on the temperature of the working environment. Comparison of the studied ellipsoidal shells with the spherical segments having the same base and depth of pole under the base was also presented. It was found that the biggest critical loads are observed at low temperatures with a significant reduction of their values at elevated temperatures for oblate ellipsoidal shell under the joint action of pressure of the compressed gas and its temperature. Herein, the loads of wave formation in a parallel for all the considered values of temperature are not observed. It is shown that oblate hemi-ellipsoidal shell provides an axisymmetric form of stability loss with the opening of their central part at low temperature and at the same temperature of the loading environment. This is consistent with the operating conditions of the safety reverse buckling disks. It is shown that small changes in geometry lead to a significant change in the stress-strain state and in stability of the considered shells.
Keywords:
reverse buckling disks, ellipsoidal shell, nonlinear bending, temperature, pressureReferences
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