Investigation on Structural Failure of Medium-thick and Egg-shaped Composite Shell
Structural failure of medium-thick and egg-shaped composite shells under hydrostatic pressure is investigated theoretically and experimentally.Firstly,the stress distribution of an egg-shaped composite shell under a designed water depth of 2 000 meters is investigated by analytical and finite element methods respectively.The critical buckling load and strength failure load of the shell are studied.Then,combined with the latest manufacturing process of the egg-shaped composite shell and its end sealing requirement,the egg-shaped composite pressure shell model and its metal joint are designed.The model is manufactured and tested up to failure under hydrostatic external pressure.The failure mode,ultimate load,and shell strains of the shell model are obtained.The results show that the shell mainly causes strength failure under the hydrostatic pressure while the buckling failure mode is not significant.The numerical result of the failure load of the shell under hydrostatic pressure agrees well with the test result.The research results can provide a reference for the structural design and optimization of the pressure hull of egg-shaped composite shell of deep submersibles.
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