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Prediction method of incubation period of elliptical axial internal surface cracks in high temperature pipelines

A forecasting method, elliptical technology, applied in forecasting, special data processing applications, instruments, etc., to achieve the effect of simplifying engineering applications

Active Publication Date: 2019-01-22
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

However, the prediction model is currently only used to predict the incubation period of standard compact tensile specimens, and there are still certain limitations in the application of actual service pipelines

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  • Prediction method of incubation period of elliptical axial internal surface cracks in high temperature pipelines
  • Prediction method of incubation period of elliptical axial internal surface cracks in high temperature pipelines
  • Prediction method of incubation period of elliptical axial internal surface cracks in high temperature pipelines

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Embodiment Construction

[0013] The technical scheme of the present invention will be further described below in conjunction with specific examples.

[0014] The method for predicting the incubation period of an elliptical axial inner surface crack in a high-temperature pipeline according to this embodiment includes the following steps:

[0015] S1: Establish a prediction model for the incubation period of an elliptical axial inner surface crack in a high-temperature pipeline, the model includes a high-temperature pipeline body, a constant pressure load is applied to the inside of the pipeline body, and the direction of the pressure load is perpendicular to the pipe wall , there are prefabricated elliptical axial inner surface cracks in the thickness direction of the pipe, and the crack front is on the axial section. For the finite element model, see figure 1 . The change of damage value with time is obtained by custom variables in the post-processing, the position of the crack front under study (suc...

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Abstract

The invention discloses a prediction method of incubation period of elliptical axial internal surface cracks in high temperature pipelines, comprises the following steps: (1) determining a crack depthratio a / t, a crack length ratio a / c, and an internal pressure P of an elliptical axial internal surface crack in a high-temperature pipeline, wherein a is the crack depth, t is the pipeline thickness, and 2c is the crack length; (2) normalizing the internal pressure P to obtain P ', where P '= P / (1MPa), P 'and a / t in step (1), substituting a / c into the fitting equation of the present invention,calculating to obtain The creep incubation period. The invention has the beneficial effect that a creep incubation period prediction formula of a pipeline containing an elliptical axial inner surfacecrack is proposed by fitting a large amount of simulation data, so that the prediction of the creep incubation period of a pipeline containing an elliptical axial inner surface crack at a high temperature is more simple and convenient.

Description

technical field [0001] The invention relates to the critical evaluation of the incubation period prediction project of the elliptical axial inner surface crack in the high-temperature pipeline, that is, the evaluation of the incubation period of the high-temperature pipeline when the elliptical axial inner surface crack is determined in the high-temperature pipeline. Background technique [0002] Steam pipes serving in high-temperature environments will inevitably have various defects during production and service. The initiation and propagation of creep cracks is a major failure mechanism of high-temperature components containing defects and leads to failure before the design life. The incubation period of creep cracks occupies a large proportion in the service life of high-temperature components. In order to ensure the reliability of components serving in high-temperature environments, the research on the incubation period of creep cracks becomes more and more important. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q10/04
CPCG06Q10/04G06F30/23
Inventor 徐连勇邬栋权荆洪阳韩永典赵雷吕小青
Owner TIANJIN UNIV