Predicating method for creep incubation period taking restrain effect into consideration under elastic transient creep condition

A technology of creep condition and restraint effect, 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 The integrity of the stress change in the creep process, but the influence of the restraint effect of the structure on the incubation period has not been studied; in recent years, researchers have conducted a lot of research on the influence of the restraint effect on the growth of creep cracks

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  • Predicating method for creep incubation period taking restrain effect into consideration under elastic transient creep condition
  • Predicating method for creep incubation period taking restrain effect into consideration under elastic transient creep condition
  • Predicating method for creep incubation period taking restrain effect into consideration under elastic transient creep condition

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Embodiment Construction

[0055] 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.

[0056] In this embodiment, P92 high-temperature heat-resistant steel is selected, a CT sample with B=10mm, W=20mm, a / W=0.5 is taken as the research object, and the main load P=1200N is taken as the research load. Its main material properties are shown in the table below:

[0057]

[0058] Among them: E-16 is 10 to the power of -16.

[0059] The creep incubation period prediction method considering the restraint effect under elastic transient creep conditions includes the following steps:

[0060] S1: Create as figure 1 The model shown: the model includes a CT sample body 1, a groove 3 is provided at the front end of the middle part of the CT sample body 1, a gap 4 is provided at...

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Abstract

The invention discloses a predicating method for a creep incubation period taking a restrain effect into consideration under an elastic transient creep condition. On the basis of Davies work, the predicating model for the creep incubation period taking the restrain effect into consideration is disclosed. A ductile dissipative damage model is utilized, and a restrain parameter Q is introduced to calculate the creep incubation period taking the restrain effect into consideration. A compact tensile specimen (CT) is applied with main load to perform a creep simulation experiment. The predicating method for the creep incubation period has the beneficial effects that the creep incubation period under the elastic transient creep condition can be simply and effectively predicated in the structure.

Description

technical field [0001] The present invention relates to the engineering critical evaluation of the creep incubation period of a high-temperature structure considering the restraint effect under the condition of elastic transient creep. Creep crack initiation life of high temperature structures. 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 cracks, incomplete penetration, welding pores and slag inclusions i...

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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