Non-probabilistic reliability analysis of spherical pressure hulls based on interval number theory

摘要

Sampling information of uncertain parameters on deep-sea pressure hull is rare, which affects the reliability of pressure hull structures. A non-probabilistic reliability analysis method is applied. Interval number is used to describe uncertain parameter, while satisfactory degree of a statement, that the predicted collapse pressure interval is larger than the loading interval, is defined and considered as a probability index. The obtained probability index can be referenced by designers. A non-probability analysis of the spherical shell of "Jiaolong"manned submersible is performed, and the method is proved to be valid and practical.

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