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A Strength Evaluation Method Based on Minimum Reliable Safety Factor

A technology of safety factor and strength, applied in the field of strength assessment of mechanical structures, can solve problems such as design redundancy and achieve the effect of avoiding design redundancy

Active Publication Date: 2022-04-05
BEIHANG UNIV
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Problems solved by technology

[0003] Aiming at the problem that the traditional safety factor cannot fully reflect the actual working conditions of the structure and there is design redundancy, a strength evaluation method based on the minimum reliable safety factor considering the uncertainty of parameters such as stress and strength is proposed

Method used

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  • A Strength Evaluation Method Based on Minimum Reliable Safety Factor
  • A Strength Evaluation Method Based on Minimum Reliable Safety Factor
  • A Strength Evaluation Method Based on Minimum Reliable Safety Factor

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Embodiment Construction

[0064] The following will combine figure 1 With a certain type of pressure vessel equipment flange strength evaluation case, the present invention is further described in detail, and the specific process is as follows:

[0065] (1) Use the numerical simulation method to analyze the static structure of the flange, the results are as follows figure 2 , according to the ASME standard under the design conditions, the strength evaluation of the flange mainly considers the influence of the primary overall film stress and the primary bending stress, and the stress needs to be linearized, and four stress linearization paths are set at the stress concentration. The primary film stress and primary film stress+bending stress peak values ​​of the four paths are shown in Table 2. On path 1, P m and P m +P b The largest, respectively 5.7604Mpa and 21.679Mpa.

[0066] Table 2 Stress level of each path of the flange

[0067]

[0068] (2) To solve the minimum reliable safety factor, i...

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Abstract

The present invention is a strength evaluation method considering the random uncertainty of structural parameters, that is, firstly carry out structural analysis on the mechanical structure, find out the weak link or the stress concentration area; determine the stress distribution function of this area; determine the distribution function of the strength; select The corresponding calculation formula of the minimum reliable safety factor; determine the confidence degree of the limit value of stress and strength to calculate the minimum reliable safety factor and evaluate the strength. Through the above steps, the present invention can obtain the minimum reliable safety factor considering stress and strength dispersion, and reduce redundancy and cost under the premise of ensuring structural safety.

Description

(1) Technical field: [0001] The invention provides a strength evaluation method based on the minimum reliable safety factor, which is a strength evaluation method suitable for mechanical structures and belongs to the technical field of reliability engineering. (2) Background technology [0002] The traditional strength evaluation method, such as using the safety factor method, regards the stress and strength of the structure as a certain value. However, in actual situations, the parameters such as strength and stress are affected by many factors, such as part size, material properties, and operating temperature. etc. It is impossible to be a certain exact value, but to fluctuate randomly within a certain range. When the parameter dispersion is large or the working environment is complex, the safety factor cannot accurately evaluate the structural strength, and the designer must take a large design margin, considering that there is room for optimization in terms of lean desig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14
Inventor 孙博龚建硕杨西任羿冯强杨德真王自力
Owner BEIHANG UNIV
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