Strength evaluation method based on minimum reliable safety coefficient

A technology of safety factor and determination method, which is 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: 2020-04-21
BEIHANG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Strength evaluation method based on minimum reliable safety coefficient
  • Strength evaluation method based on minimum reliable safety coefficient
  • Strength evaluation method based on minimum reliable safety coefficient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0069] 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:

[0070] (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.

[0071] Table 2 Stress level of each path of the flange

[0072]

[0073] (2) To solve the minimum reliable safety factor, i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a strength evaluation method considering random uncertainty of structural parameters, which comprises the following steps of: firstly, carrying out structural analysis on a mechanical structure to find out a weak link or a stress concentration area; determining a stress distribution function of the area; determining a distribution function of the intensity; selecting a corresponding minimum reliable safety coefficient calculation formula; and determining confidence coefficients of stress and strength limit values so as to calculate a minimum reliable safety coefficientand evaluate the strength. By means of the steps, the minimum reliable safety coefficient of stress and strength dispersity can be considered, redundancy is reduced on the premise that structural safety is guaranteed, and the cost is reduced.

Description

[0001] (1) Technical field: [0002] 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. [0003] (2) Background technology [0004] 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 term...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap