Research on ultimate strength of deep diving pressure spherical shell under modal defect condition

被引：0
作者：
Xiong Z. [1 ]
Huang Z. [2 ]
Zhang D. [2 ]
Hu X. [2 ]
机构：
[1] College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai
[2] College of Logistic Engineering, Shanghai Maritime University, Shanghai
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2020年 / 41卷 / 01期
关键词：
Buckling; Deep-sea vehicle; Defect; Finite element method; Mode; Pressure spherical shell; Reliability analysis; Stochastic defects; Ultimate strength;
D O I：
10.11990/jheu.201901101
中图分类号：
学科分类号：
摘要：
To investigate the effect of the initial defect on the ultimate strength of the deep diving pressure spherical shell, the buckling mode was introduced as the initial defect form of the deep diving pressure spherical shell. The defect forms of first 15th order buckling modes were studied and compared. It was found that the ultimate strength based on the condition of the 15th order modal defect was the minimum. Based on the ultimate strength calculation of 210 kinds of pressure spherical shells with random defects, the statistical distribution probability of the results was established. The reliability of the ultimate strength values obtained from the first 15th order modal defects was evaluated. Finally, based on the most reliable modal defect condition, the sensitivity of different thickness-to-radius ratios to the defect amplitudes was analyzed. The results show that the effect of initial geometrical defect on the ultimate strength of the pressure spherical shell was larger, and the minimum ultimate strength was about 51% of the perfect structure. With the increase of the defect amplitude, the critical buckling load of the pressure spherical shell decreased continuously. The downtrend presents an approximately linear relationship. With the increase of the thickness-to-radius ratio, the effect of the defect amplitude on the ultimate strength of the pressure spherical shell will weaken. © 2020, Editorial Department of Journal of HEU. All right reserved.
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页码：76 / 80
页数：4
相关论文
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