Prediction method for creep inoculation period considering residual stress under plastic condition

A technology of residual stress and prediction method, applied in the direction of measuring device, strength properties, and ductility of testing materials, which can solve the problems of unresearched influence and service life of components.

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 consid...

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  • Prediction method for creep inoculation period considering residual stress under plastic condition
  • Prediction method for creep inoculation period considering residual stress under plastic condition
  • Prediction method for creep inoculation period considering residual stress under plastic condition

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Embodiment Construction

[0061] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0062] In this embodiment, P92 high-temperature heat-resistant steel is selected, a CT sample with B=20mm, W=40mm, a / W=0.5 is taken 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:

[0063]

[0064] Among them: E-16 is 10 to the power of -16.

[0065] The creep incubation period prediction method containing residual stress under the plastic condition of the present invention comprises the following steps:

[0066] 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 ...

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Abstract

The invention discloses a prediction method for a creep inoculation period considering a residual stress under a plastic condition. On the basis of Davies work, the prediction model for the creep inoculation period considering the residual stress is provided. By means of a reference stress method, an elastic follow factor Z is introduced to calculate the creep inoculation period considering the residual stress. The residual stress is generated through pre-compression by using a compact tensile sample (CT), and a main load is applied to perform a creep test. The method has the beneficial effects that an original prediction model can be expanded into a model comprising the residual stress, and the simplified prediction method for the creep inoculation period under the plastic condition is provided, so that the creep inoculation period under the plastic condition can be concisely and effectively predicted in a structure.

Description

technical field [0001] The invention relates to engineering critical evaluation of creep incubation period of high-temperature structures containing residual stress under plastic conditions, which is to determine the creep crack initiation life of the high-temperature structure when surface cracks exist in the structure and are under plastic 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 pipelines of the unit, especially c...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01N3/28
CPCG01N3/28G01N2203/0017G01N2203/006G01N2203/0071G01N2203/0226G06F30/23G06F2111/10
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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