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Estimation method for analyzing ultimate bearing capacity of bends

A technology of ultimate bearing capacity and pipe bending, which is used in computing, special data processing applications, instruments, etc., can solve the problems of complex calculation process, difficult engineering application, large amount of calculation, etc., and achieve the effect of high calculation accuracy

Active Publication Date: 2018-03-20
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EPIA has a reliable theory and high calculation accuracy. Its effectiveness has been verified by a large number of model experiments. It has been applied to plate and shell structures and is usually used to test the accuracy of other analysis methods. However, it needs to consider the ultimate bearing capacity of engineering structures The complex loading process requires a large amount of calculation; the principle of EMAP is simple and can avoid the complex elastic-plastic analysis process, but it requires multiple linear elastic iterative analysis, resulting in complex calculation process and difficult engineering application

Method used

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  • Estimation method for analyzing ultimate bearing capacity of bends
  • Estimation method for analyzing ultimate bearing capacity of bends
  • Estimation method for analyzing ultimate bearing capacity of bends

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment is a specific example of the method for estimating the analysis of the ultimate bearing capacity of an elbow, including the following steps:

[0058] (1) Establish the analysis model of the elbow structure:

[0059] The geometric dimensions of a 90° elbow are shown in Table 1, and the material parameters are shown in Table 2. Bearing the internal water pressure P, the right end of the elbow is fixedly constrained, and the left end is not constrained. The calculation model of the elbow is as follows figure 1 As shown, the ANSYS software is used for modeling, and the shell element is used for simulation. The finite element mesh of the elbow is as follows figure 2 .

[0060] Table 1 Bend Pipe Geometric Dimensions

[0061] parameter

Outer radius D O / mm

inner radius D I / mm

Bending radius R / mm

value

104

86.7

86.7

[0062] Table 2 Bend material parameters

[0063] parameter

Yield strength σ s ...

Embodiment 2

[0076] For the analysis of the ultimate bearing capacity of the elbow described in Example 1, EPIA, whose calculation accuracy has been recognized in the field, was used to solve it, and ANSYS software was used to extract the number of iterations required by EPIA to solve the ultimate bearing capacity. The calculation results are shown in Table 5.

[0077] Table 5 Comparison of calculation accuracy and efficiency between EPIA and estimation methods

[0078] calculation method

[0079] It can be seen from Table 5 that the ultimate bearing capacity of the elbow calculated by the estimation method has good calculation accuracy, and the error with EPIA is only 6.21%. EPIA needs 433 iteration steps to solve the ultimate bearing capacity of the elbow, and the calculation efficiency is low. The method of the present invention only needs to pass through two linear elastic analysis, overcomes the complex loading process and multiple iterative analysis that EPIA needs to consi...

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Abstract

The invention relates to a numerical method for analyzing ultimate bearing capacity of bends and in particular relates to an estimation method for analyzing ultimate bearing capacity of bends. The method comprises the following steps: (1) establishing a bend structure analysis model; (2) performing primary linear elastic analysis; (3) performing secondary linear elastic analysis; and (4) calculating the ultimate bearing capacity of the bends according to the estimation method. According to the method disclosed by the invention, only the linear elastic analysis twice is needed, and rapid estimation of the ultimate bearing capacity of the bends is realized. The defects that a complicated loading process needs to be set in an elastic-plastic incremental method for analyzing the ultimate bearing capacity of the bends, repeated incremental iterative analysis is performed and the like are overcome, and a high-efficiency pathway is provided for rapidly and reasonably determining the ultimatebearing capacity of the bends at a primary design stage of the bends.

Description

technical field [0001] The invention relates to a numerical method for analyzing the ultimate bearing capacity of an elbow, in particular to an estimation method for analyzing the ultimate bearing capacity of an elbow. Background technique [0002] With the rapid development of national defense industry, medical and chemical machinery, elbows have been widely used in engines, gas transportation, and liquid transportation. Therefore, ensuring the safety of the elbow is a very important engineering problem, and the ultimate bearing capacity is an important indicator to characterize the overall safety, so related research is an important subject of elbow research. [0003] The analysis methods of ultimate bearing capacity of elbow mainly include test method and numerical method. The test method gradually loads the structure until the structure is destroyed through the structural destructive test, and then obtains the ultimate bearing capacity of the structure, which has the ad...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 张阳牛景太郭英嘉
Owner NANCHANG INST OF TECH
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