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Post-buckling reliability analysis method for composite material stiffened wall plate based on self-adaptive important sampling

A technology of reinforced wall panels and composite materials, applied in special data processing applications, instruments, electrical digital data processing, etc. Efficient and rapid reliability analysis, improved application level, and stable failure probability

Active Publication Date: 2020-10-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The approximate analytical method is only suitable for problems with special geometric boundaries and loading conditions, and it is difficult to solve problems with complex boundaries and loading conditions; the Monte Carlo method takes the mean point as the sampling center, and has high calculation accuracy, but low sampling efficiency and poor convergence. Slow, computationally expensive, usually used as a tool to test other methods

Method used

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  • Post-buckling reliability analysis method for composite material stiffened wall plate based on self-adaptive important sampling
  • Post-buckling reliability analysis method for composite material stiffened wall plate based on self-adaptive important sampling
  • Post-buckling reliability analysis method for composite material stiffened wall plate based on self-adaptive important sampling

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Embodiment Construction

[0025] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0026] Modeling of Post-buckling Failure of Composite Stiffened Panel Structures

[0027] figure 1 The schematic diagram of the structure of the reinforced wall panel is shown. Due to the dispersion of the structural material properties of the reinforced wall panel and the error in the manufacturing process, there will be deviations in the structural size. Combining engineering experience and theoretical analysis, the composite material panel Thickness X 1 , ply angle X 2 , skin width X 3 , the width of the horizontal edge X 4 and x 5 Rib height X 6 and the length of the reinforced laminate X 7 is an implicit function of the limit load.

[0028] The failure load Load{X 1 ,X 2 ,...,X 7}.

[0029] The limit state equation for post-buckling of the stiffened panel is g(X)=Load{X 1 ,X 2 ,...,X 7}-X 8 (1)

[0030] In the formula: variable X={X 1 ,X ...

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Abstract

The invention relates to a post-buckling reliability analysis method for a composite material stiffened wall plate based on self-adaptive important sampling. The ultimate buckling load of the stiffened wall plate is calculated by using a semi-empirical formula; the uncertainty variable of the reinforced wallboard structure is studied, the reliability analysis is performed on the post-buckling of the composite reinforced wallboard by adopting a self-adaptive important sampling method, the failure probability of the post-buckling is efficiently and quickly obtained, and the reliability evaluation of the composite reinforced wallboard structure is realized.

Description

technical field [0001] The invention belongs to the field of reliability, and relates to reliability analysis of post-buckling of composite material reinforced wall plates, in particular to a post-buckling reliability analysis method of composite material reinforced wall plates based on self-adaptive importance sampling. Background technique [0002] Due to the advantages of high specific strength, high specific stiffness and strong designability, composite materials have been widely used in the aviation field. Composite materials often appear in the form of laminated plates and laminated shells in aeronautical structures. These structures are generally thin, and the overall stiffness or local stiffness is often enhanced by setting ribs. The main failure mode of a reinforced structure is loss of stability of the structure. In order to ensure and improve the design and safety of composite material reinforced panels, it is particularly important to analyze the reliability of ...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/02G06F111/08G06F113/24G06F113/26
CPCG06F30/20G06F2111/08G06F2119/02G06F2113/26G06F2113/24
Inventor 张峰武明英徐夏雨张旭程磊王佩艳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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