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Method for calculating ultimate bearing capacity value of double-layer cylindrical pressure-resistant shell

A technology of carrying capacity and calculation method, applied in the field of deep-sea engineering, can solve problems such as lack of calculation and analysis methods, and achieve the effect of improving calculation efficiency and calculation accuracy

Pending Publication Date: 2021-02-02
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a calculation method for the numerical value of the ultimate bearing capacity of double-layer cylindrical pressure hulls in view of the lack of calculation and analysis means for the ultimate bearing capacity of double-layer cylindrical pressure hulls in the background technology

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  • Method for calculating ultimate bearing capacity value of double-layer cylindrical pressure-resistant shell
  • Method for calculating ultimate bearing capacity value of double-layer cylindrical pressure-resistant shell
  • Method for calculating ultimate bearing capacity value of double-layer cylindrical pressure-resistant shell

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Embodiment

[0101] In order to verify the correctness of the above numerical calculation method, according to the parameters in Table 1, three stainless steel double-layer cylindrical shells were processed, and the buckling load was measured after the hydraulic test. The model is obtained by a three-dimensional scanner, and the thickness of a single layer is measured by an ultrasonic thickness gauge. Using this method to calculate, the error between the numerical results and the experimental results is small, and the performance of the double shell can be well predicted. The actual measured gap value is about 0.12mm, that is Figure 4 In the left position of 0.12to, the value is about 8.5MPa. Considering the existence of defects, the critical load further decreases, which is similar to the test value, so the numerical solution can play a very good predictive role. The test results and calculation results are shown in Table 3.

[0102] Table 1

[0103]

[0104] table 3

[0105]

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Abstract

The invention discloses a method for calculating the ultimate bearing capacity value of a double-layer cylindrical pressure-resistant shell, and relates to the technical field of deep sea engineering.The method comprises the following steps: firstly, establishing an initial geometric model of the double-layer cylindrical shell, then establishing a finite element model of the double-layer cylindrical shell, determining elastic-plastic parameters of a double-layer cylindrical shell material, defining section parameters and boundary conditions of the finite element model of the double-layer cylindrical shell, and then performing nonlinear solving calculation by adopting a Newton iteration method; and finally, extracting a calculation result of the double-layer cylindrical shell. According tothe invention, inner and outer layer cylindrical shell grid nodes are in one-to-one correspondence, a one-dimensional gap unit is used, a complex contact nonlinear problem is converted into a simplesmall slip model, and the calculation efficiency is improved; meanwhile, geometric nonlinearity, material nonlinearity and boundary nonlinearity are considered, the arc length method is adopted for carrying out nonlinear buckling calculation on the ultimate bearing capacity of the double-layer cylindrical pressure-resistant shell, and the calculation precision is improved.

Description

technical field [0001] The invention relates to the technical field of deep-sea engineering, in particular to a method for calculating the ultimate bearing capacity value of a double-layer cylindrical pressure-resistant shell. Background technique [0002] Submersibles are important equipment for ocean exploration and development. The pressure hull is the key component and buoyancy unit of the submersible. During the submersible's dive, the pressure hull can ensure that the internal equipment is not damaged and the safety of the staff, while providing positive buoyancy. The cylindrical shell is the basic pressure-bearing unit of the pressure shell, which has the advantages of high space utilization, good hydrodynamic characteristics, and convenient design and calculation. [0003] However, the ultimate load-carrying capacity of cylindrical shells is very sensitive to initial geometric imperfections, resulting in reduced safety. The double-layer cylindrical shell can offset ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/17G06F111/10
CPCG06F30/23G06F30/17G06F2111/10Y02T90/00
Inventor 张建朱镇扬王风唐文献殷宝吉狄陈阳王芳
Owner JIANGSU UNIV OF SCI & TECH
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