Method for predicting creeping incubation period containing residual stress under plastic transient creeping condition

A technology of residual stress and creep conditions, applied in the direction of applying stable tension/compression to test material strength, measuring devices, strength characteristics, etc., can solve the problems that the impact has not been studied, the impact of component service life, etc.

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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  • Method for predicting creeping incubation period containing residual stress under plastic transient creeping condition
  • Method for predicting creeping incubation period containing residual stress under plastic transient creeping condition
  • Method for predicting creeping incubation period containing residual stress under plastic transient creeping condition

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Embodiment Construction

[0075] 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.

[0076] 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:

[0077]

[0078] Where E-16 is 10 to the power of -16.

[0079] The creep incubation period prediction method containing residual stress under the plastic transient creep condition of the present invention comprises the following steps:

[0080] S1: Create as figure 1The 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 sa...

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Abstract

The invention discloses a method for predicting a creeping incubation period containing residual stress under a plastic transient creeping condition. A prediction model for the creeping incubation period considering the residual stress is proposed; by utilizing a referential stress method, an elastic following factor Z is introduced so as to calculate the creeping incubation model considering theresidual stress; a compact tension specimen (CT) is pre-compressed to produce the residual stress, and main load is applied to carry out a creeping experiment. The method disclosed by the invention has the beneficial effects that a creeping incubation period prediction model under a modified elastic transient creeping condition is proposed, so that the simplified method for predicting the creepingincubation period under the transient creeping condition is provided; therefore, the creeping incubation period under the elastic transient creeping condition can be simply and effectively predictedin the structure.

Description

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

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/18
CPCG01N1/28G01N3/18G01N2203/0071G01N2203/0226
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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