Abstract
On the basis of the practical load-supporting conditions of large-scale spherical vessels for water or oil storage, the integral hydro-bulge forming technology of non-uniform thickness spherical vessels and a new method for measuring the strain of the inner surface of spherical vessels are advanced in this paper, and they are proved to be successful by means of experiment. The feasibility of the technology is investigated; the design of the structure and the choice of technological parameters are also studied in this paper. The strain, thickness distribution and diameter variations are analysed, together with the deformation process of the shell, which is analysed by using the elastoplastic finite-element method (FEM). The results of FEM simulation are very similar to those of the experiment.
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