Accurate pipeline elbow stress calculation method

A calculation method and elbow technology, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as unreliable strength or fatigue analysis results, and achieve the effect of wide applicability

Active Publication Date: 2021-02-05
XI AN JIAOTONG UNIV
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Problems solved by technology

The true stress at the elbow will be higher than the stress value obtained by introducing formulas (1) and (2), resulting in unreliable strength or fatigue analysis results

Method used

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  • Accurate pipeline elbow stress calculation method
  • Accurate pipeline elbow stress calculation method
  • Accurate pipeline elbow stress calculation method

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Embodiment Construction

[0054] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0055] The present invention is an accurate calculation method of pipeline elbow stress, which mainly includes the following steps:

[0056] Step 1: Calculate the stress increase coefficient of the elbow under the influence of pipeline displacement.

[0057] Since the displacement of the pipeline will cause the elliptical deformation of the elbow section, which will cause stress concentration, it is necessary to consider the stress increase caused by the displacement of the pipeline. Firstly, the flexibility characteristic is introduced, and the stress intensification factor is calculated on this basis. At the same time, because of the difference in the in-plane and out-of-plane deformation of the pipeline elbow, the calculation of the stress increase coefficient of the elbow under the influence of pipeline displacement is divided into two parts...

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Abstract

The invention discloses an accurate pipeline elbow stress calculation method. The method comprises the steps: 1, calculating an elbow stress increase coefficient under the influence of pipeline displacement; 2, calculating an elbow stress increase coefficient iF under the influence of an external load; 3, synthesizing the two parts of stress increase coefficients to obtain a total stress increasecoefficient i1; and 4, calculating the accurate stress at the elbow; According to the method, the stress of the pipeline elbow can be efficiently and accurately calculated, so that the stress analysisresult of the elbow is more accurate and reliable. The introduction of the accurate stress increase coefficient can effectively reduce the error between the calculated value and the true value of thestress of the pipeline elbow, thereby improving the credibility of the strength and fatigue analysis result.

Description

technical field [0001] The invention relates to a pipeline elbow stress analysis technology, in particular to an accurate pipeline elbow stress calculation method. Background technique [0002] As an important channel for fluid transmission and energy conversion, the fluid pipeline system is widely used in petrochemical, energy power, aerospace and other engineering fields. As an important part of the pipeline system, the elbow can not only change the direction of the pipeline, but also play an important role in improving the flexibility of the pipeline, relieving constraints, and compensating for thermal expansion. However, during the service process of the pipeline, under the combined action of structure and fluid load, the elbow is likely to cause problems such as deformation and stress concentration, and even lead to strength failure and fatigue damage, seriously affecting normal production and personnel safety. Therefore, efficient and accurate strength and fatigue ana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F113/14G06F119/04G06F119/14
CPCG06F30/23G06F2113/14G06F2119/14G06F2119/04
Inventor 白长青张腾顾振杰
Owner XI AN JIAOTONG UNIV
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