Study on Residual Strength of Egg-Shaped Pressure Shell With Local Damage

Abstract

The eggshell is a multifocal, rotary thin-walled structure that satisfies the positive Gaussian curve. The eggshell meets the dome principle and requires no additional rib support to achieve sufficient strength and stability with minimal material. Some scholars have applied this bionic prototype to the pressure-resistant shell, which proves that it has good comprehensive performance. However, there is less in-depth discussion of the buckling characteristics of this new pressure-resistant shell yet. In this paper, the dangerous situation of collision, reefing and other accidents during the use of deep submersibles is considered, the residual strength of the shell with partial damage is studied, which is of practical engineering significance. Firstly, the ABUQUS finite element software is used to calculate the buckling of the egg-shaped pressure shell with local deformation, and the influence of local deformation on the buckling mode and ultimate bearing capacity of the pressure shell is analyzed. Secondly, by designing the pressure-resistant shells with different concave amplitudes and recessed positions, the influence of the pressure-resistant shell on the stability of the pressure-resistant shell is analyzed. Finally, according to the calculation results, the sensitivity law of different concave positions to the concave amplitude is summarized, and the beneficial engineering opinions are given.