Predicating method for creep incubation period containing residual stress under elastic condition

A technology of residual stress and prediction method, which is applied in the direction of applying stable tension/pressure to test material strength, measuring devices, strength characteristics, etc., and can solve problems such as the influence of component service life and the influence that has not been studied

Active Publication Date: 2018-11-02
TIANJIN UNIV
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Problems solved by technology

The creep incubation period is the longest stage in the creep process, and the accurate prediction of the incubation period is of great significance for the prediction of the creep life of high-temperature structures; the incubation period prediction model proposed by Davies et al. based on the ductile dissipation model considers

Method used

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  • Predicating method for creep incubation period containing residual stress under elastic condition
  • Predicating method for creep incubation period containing residual stress under elastic condition
  • Predicating method for creep incubation period containing residual stress under elastic condition

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Embodiment Construction

[0059] The technical scheme of the present invention will be further described below in conjunction with specific examples.

[0060] In this example, P92 high-temperature heat-resistant steel is selected, and a CT sample with B=20mm, W=40mm, a=10mm, a / W=0.5 is used as the research object, and the preload is 12000N and the main load P=12000N as the research load . Its main material properties are shown in the table below:

[0061]

[0062] Among them: E-16 is 10 to the power of -16.

[0063] The creep incubation period prediction method containing residual stress under the elastic condition of the present invention comprises the following steps:

[0064] S1: Create as figure 1 The model shown: the model includes a CT sample body 2, a groove 4 is provided at the front end of the middle part of the CT sample body 2, a gap 5 is provided at the rear of the groove 4, and an upper part is provided on the CT sample body 1. The main load pin hole 3, the lower main load pin hole...

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Abstract

The invention discloses a predicating method for a creep incubation period containing residual stress under an elastic condition. On the basis of Davies work, the predicting model for the creep incubation period taking residual stress into consideration is disclosed. A reference stress method is utilized, and an elastic following factor Z is introduced to calculate the creep incubation period taking residual stress into consideration. A compact tensile specimen (CT) is pre-compacted to generate residual stress, and main load is applied to perform a creep experiment. The predicating method forthe creep incubation period has the beneficial effects that the predicting model for the creep incubation period under the corrected elastic condition is disclosed, and compared with an existing model, the method can expand the original predicating model into the model containing residual stress.

Description

technical field [0001] The present invention relates to engineering critical evaluation of creep incubation period of high-temperature structures containing residual stress under elastic conditions, which is to determine the method for evaluating the creep crack initiation life of the high-temperature structure when surface cracks exist in the structure and are under elastic stress conditions . Background technique [0002] The coal-based energy structure is one of the main causes of smog in my country, and coal-fired power generation is currently the most important power generation method in my country, and this trend will exist for a long time. Therefore, in addition to changing the energy structure, developing efficient and clean ultra-supercritical (USC) units is one of the important ways to save energy and reduce emissions. However, the increase of parameters such as steam temperature and pressure has led to a very harsh service environment for the key high-temperature...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N1/28
CPCG01N1/286G01N3/18G01N2203/0071G01N2203/0226
Inventor 徐连勇邬栋权荆洪阳韩永典赵雷吕小青
Owner TIANJIN UNIV
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