A Simplified Method for Calculating Ultimate Strength of Pressure Hull in Deep-Sea Manned Submersible

Abstract:

Based on the strain energy density theory, the connotation of tangent modulus theory is developed. At critical equilibrium state, a dimensionless number Φ_t of a structure under pressure is introduced in this paper. Derived from the stress-strain curve of material, a four-parameter formula that contains Φ_t is established. This formula is referred to as the function of strength utilization ratio that may be used for calculating the inelastic buckling of deep submersible pressure hull.Φ_t can be used to express the effect of initial imperfection of the shell and to guide the experimental study. Compared with the data from some experiments or other methods, it has demonstrated that the method given by this paper is more precise and convenient for predicting the failure of thin and moderately thick shell under pressure.

• Periodical: Applied Mechanics and Materials (Volume 160)
• Pages: 17-24
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.160.17
• Online since: March 2012
• Authors: Li Hao Yuan, Zhi Xin Xiong, Lei Song, Zhi Hui Dong
• Keywords: Deep-Sea Manned Submersible, Equilibrium State Parameters, Initial Imperfection, Pressured Spherical Hull, Tangent Modulus Theory, Ultimate Strength

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