Abstract
In this paper, the technology of the integral hydro-bulge forming of double-layer gap spherical vessels is introduced and the hydro-bulging process of the double-layer single-curvature shells is researched by means of the finite-element method (FEM) and experimentation. The experimental results show that the pressurization to only the internal sheel can only lead to the full deformation of the internal shell and the partial deformation of the external shell. Application of pressure to the interspace is needed to ensure that the external shell reaches its final forming pressure, so that finally a full deformation of the double-layer gap spherical vessel is obtained. Three-dimensional fluid elements combined with shell elements are used to simulate the hydro-bulging process of a spherical shell in this paper. The FEM results are in good agreement with those of the experiments. The FEM results of the deforming process and characteristics of the shells are analyzed: the distribution of the inside and outside surfaces of both the internal and external shells by FEM are presented.
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