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

A technology of residual stress and creep conditions, applied in the direction of applying stable tension/pressure to test material strength, measuring device, strength characteristics, 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 considers

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

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Embodiment Construction

[0081] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0082] 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:

[0083]

[0084] Where E-16 is 10 to the power of -16.

[0085] The method for predicting the creep incubation period of a high-temperature structure containing residual stress under elastic conditions of the present invention comprises the following steps:

[0086] 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...

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Abstract

The invention discloses a predicating method for a creep incubation period containing residual stress under an elastic transient creep condition. On the basis of Davies work, a predicating 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 a 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 test. The predicating method for the creep incubation period has the beneficial effects that the original predicating model can be expanded into a model containing the residual stress, so that a simplified predicating method for the creep incubation period under the transient creep condition is disclosed, and the creep incubation period can be simply and effectively predicated under the elastic transient creep condition inthe structure.

Description

technical field [0001] The invention relates to the engineering critical evaluation of the creep incubation period of high-temperature structures containing residual stress under elastic transient creep conditions, that is, to determine when there are surface cracks in the structure and under transient creep conditions, the evaluation of the high-temperature structure 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 the key high-temperatu...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N1/28
CPCG01N1/28G01N3/18G01N2203/0017G01N2203/0071G01N2203/0226
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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