Research on deformation mechanism of egg-shaped shell in granular medium bulging

Abstract

The design of pressure hull structure plays an essential role in the research and development of underwater operation equipment such as deep-sea submersibles. As a bionic structure, egg-shaped shell has apparent advantages in the application of an underwater pressure hull. Still, the egg-shaped shell is a positive Gauss surface, so it is difficult to control the manufacturing accuracy and quality. In this paper, the technology of solid particle flexible medium forming and the principle of high pressure bulging in tubes are proposed to manufacture high-precision egg-shaped shell parts. By optimizing the shape of the punch structure, optimizing the process parameters, improving the stress and strain distribution of the egg-shaped shell, analyzing the deformation mechanism in the bulging process, and mastering the deformation and quality control methods of the granular medium flexible bulging of non-equal curvature tubular structures.