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Method for estimating ultimate bearing capacity of hemispherical pressure-resistant capped end

A technology of ultimate bearing capacity and hemispherical shape, applied in the mechanical field, can solve problems such as errors, different boundary conditions, and lack of theoretical formula prediction methods, etc., and achieve the effect of wide application range and accurate values

Inactive Publication Date: 2018-11-30
JIANGSU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the formula of spherical shell structure can also be used for hemispherical heads, there are still certain errors due to slightly different boundary conditions
Therefore, the prediction method of the ultimate bearing capacity of the head lacks a more systematic and widely used theoretical formula prediction method

Method used

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  • Method for estimating ultimate bearing capacity of hemispherical pressure-resistant capped end
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  • Method for estimating ultimate bearing capacity of hemispherical pressure-resistant capped end

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Embodiment Construction

[0042] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0043] The present invention provides a method for estimating the ultimate bearing capacity of a hemispherical pressure-resistant head:

[0044] Step 1: Set the relevant parameters of the head, where the middle diameter r of the head is set to 60mm, the thickness value t ranges from 0.24mm to 0.6mm, and is incremented by 0.06mm, and a total of 0.24mm, 0.30mm, 0.36mm, 0.42mm, 0.48mm, 0.54mm, 0.60mm 7 kinds of thickness; yield strength σ y The range is from 180MPa to 230MPa, the increment is 10MPa, and there are 6 yield strengths of 180MPa, 190MPa, 200MPa, 210MPa, 220MPa, and 230MPa;

[0045] Step 2: Study the influence of material yield strength on the bearing capacity of the head; define the influence of the buckling strength on the ultimate bearing capacity of the head as the plastic attenuation factor, and solve the plastic attenuation facto...

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Abstract

The invention discloses a method for estimating the ultimate bearing capacity of a hemispherical pressure-resistant capped end. The method comprises the steps of 1, setting capped end related parameters, including a medium diameter r, different thickness values t and different yield strengths sigma y; 2, studying the influence on the bearing capacity of the capped end, defining the influence of the buckling strength on the ultimate bearing capacity of the capped end as plastic damping factor kp, and solving; 3, obtaining a nonlinear critical buckling load of the perfect capped end Pnon:Pnon=kpPm-t; 4, researching influence laws of geometry defects on the buckling load of the capped end, defining the influence of geometric defects on the ultimate bearing capacity of the capped end as geometric defect attenuation factor kimp, and solving; 5, on the basis of kp and kimp, conducting formula fitting on all data to solve the actual attenuation factor kreal, wherein kreal=kpkimp, and summarizing the formula for estimating the ultimate bearing capacity Preal of the capped end: Preal=krealPm-t; 6, according to the relevant parameter values of an actual shell, substituting an analytical formula to calculate the ultimate bearing capacity of the capped end Preal. The method is more systematic and has a wider application range.

Description

technical field [0001] The invention belongs to the field of machinery, in particular to a method for estimating the ultimate bearing capacity of a hemispherical pressure-resistant head. Background technique [0002] As an essential part of the pressure vessel, the head is also widely used in deep-sea pressure-resistant submersibles, and its buckling pressure-resistant characteristics have an important impact on the pressure-resistant capability of the entire submersible. Most of the existing heads are hemispherical structures, and the accurate prediction of their ultimate bearing capacity has an important impact on the safety and economic performance of the submersible. [0003] The Code for Classification and Construction of Diving Systems and Submersibles (CCS2013 for short) provides a method for predicting the ultimate bearing capacity of spherical shells. Among them, CCS means China Classification Society, hereinafter referred to as CCS. First, the numerical calculati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/17G06F2119/06
Inventor 朱永梅张跃文陈俊杰崔维成张建唐文献
Owner JIANGSU UNIV OF SCI & TECH
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