Abstract: Compared with metallic materials, composite materials have higher specific strength and specific modulus. According to equipment from the United States and other underwater technology powerhouses. Carbon fiber composite materials are an important way to make pressure-resistant cabins for water gliders. However, at present, there is no mature design method and specification for composite pressure tanks in China. Therefore, this paper takes an underwater 1000 m class composite pressure tank as an example, estimates its wall thickness using empirical formulas, and then uses ANSYS finite element analysis software. The strength check and stability analysis of the pressure-resistant tanks were performed, and finally the composite pressure-resistant tanks were verified by external pressure performance tests. It is found that the failure mode of thin-walled cylindrical composite pressure-resistant tanks is instability. The design should focus on the critical external pressure strength at the time of instability. The empirical formula used formula used in this paper can be used for thin-walled composite pressure-resistant tanks engineering application design.

Key words: deep sea, composite pressure hulls, thin-walled composite, composite structural design