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Bearing capacity reduction factor of an axially compressed cylindrical shell structure and its determination method

A reduction coefficient and determination method technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of poor reliability of the reduction coefficient, achieve structural weight reduction, ensure safety and reliability, and improve calculation efficiency effect

Active Publication Date: 2018-05-22
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only considers the influence of geometric shape defects in the structural defect analysis of the shell, and the reliability of the obtained reduction coefficient is poor.
[0005] In summary, there are still some problems in the reliability of the current method for determining the reduction factor of the bearing capacity of shell structures

Method used

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  • Bearing capacity reduction factor of an axially compressed cylindrical shell structure and its determination method
  • Bearing capacity reduction factor of an axially compressed cylindrical shell structure and its determination method
  • Bearing capacity reduction factor of an axially compressed cylindrical shell structure and its determination method

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Embodiment

[0061] Such as figure 1 As shown, a bearing capacity reduction factor of an axially compressed cylindrical shell structure, the bearing capacity reduction factor k includes the geometric shape defect reduction factor k 1 , the bearing capacity reduction factor k also includes the load defect reduction factor k 2 , Opening defect reduction factor k 3 and attribute defect reduction factor k 4 , the attribute defect reduction factor k 4 Including the reduction factor caused by material defects and the reduction factor caused by thickness defects.

[0062] The bearing capacity reduction factor k=k 1 ×k 2 ×k 3 ×k 4 .

[0063] A method for determining the reduction factor of the bearing capacity of an axially compressed cylindrical shell structure, the steps are as follows:

[0064] (1) Using the finite element numerical algorithm to analyze the buckling eigenvalues ​​of the defect-free ideal cylindrical shell structure, and obtain its ideal ultimate bearing capacity F per...

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Abstract

The invention relates to an axial pressure cylindrical shell structure bearing capacity reduction factor and a determination method thereof, and belongs to the technical field of structural mechanics analysis. The bearing capacity reduction factor k comprises a geometrical shape defect reduction factor k1 and also comprises a load defect reduction factor k2, a trepanning defect reduction factor k3 and an attribute defect reduction factor k4, wherein the attribute defect reduction factor k4 comprises a reduction factor caused by material defects and a reduction factor caused by thickness defects. The bearing capacity reduction factor adopts structure certainty analysis to independently obtain the reduction factors corresponding to the geometrical shape defect, the load defect and the trepanning defect which obviously affect the bearing capacity; then, on the basis of structure reliability analysis, the influence of other forms of defects is both considered, and a corresponding reduction factor is obtained; and finally, the four independent reduction factors are combined to obtain a new safe and robust reduction factor.

Description

technical field [0001] The invention relates to a method for determining the reduction coefficient of the bearing capacity of an axially pressed cylindrical shell structure, which belongs to the technical field of structural mechanics analysis, and relates to a method based on accurate and reliable modern numerical calculation technology to determine the bearing capacity reduction coefficient of an axially pressed cylindrical shell structure The method is especially suitable for the light-weight design technical field of large thin-walled cylindrical shell structures in aerospace, such as the shell structure of rockets and the main bearing tube of satellites; the radius of large thin-walled cylindrical shell structures is generally greater than 2m, and the height is greater than 2m. Radius / Thickness = 400-1000. Background technique [0002] The thin-walled cylindrical shell structure has high specific strength and specific stiffness performance, and is widely used as the mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 梁珂张雁
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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